Equity Method Investments and Joint Ventures [Abstract] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Scenario, Forecast [Member] Scenario, Forecast [Member] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Precidian Investments [Member] Precidian Investments [Member] Precidian Investments [Member] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Business Acquisition [Line Items] Business Acquisition [Line Items] Payments to Acquire Businesses, Gross Payments to Acquire Businesses, Gross Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners Noncontrolling Interest, Ownership Percentage by Parent Noncontrolling Interest, Ownership Percentage by Parent Variable Interest Entities and Consolidation of Investment Vehicles [Abstract] Variable Interest Entities and Consolidation of Investment Vehicles [Abstract] Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table] Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table] Legal Entity [Axis] Entity [Domain] CIVs Consolidated Investment Vehicles [Member] Voting Interest Entities and Voting Rights Entities that are consolidated into the financial statements of the registrant. The specific variable interest entities controlled by the entity may be included as children of this element. Although the registrant may not control the VIE through voting interests, it has a variable interest that will absorb a majority of the entity's expected losses, receive a majority of the entity's expected residual returns, or both. In general, a VIE is a corporation, partnership, trust, or any other legal structure used for business purposes that either (a) does not have equity investors with voting rights or (b) has equity investors that do not provide sufficient financial resources for the entity to support its activities. A VIE often holds financial assets, including loans or receivables, real estate or other property. A VIE may be essentially passive or it may engage in research and development or other activities on behalf of another company. Investment Type [Axis] Investment Type [Axis] Investments [Domain] Investments [Domain] Private Equity Funds Private Equity Funds [Member] Hedge Funds Hedge Funds [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] Investment Lock up Period Investment Lock up Period The period of time that the investment is subject to a lock-up, in years. Alternative Investments, Fair Value Disclosure Alternative Investments, Fair Value Disclosure PercentageDailyRedemption PercentageDailyRedemption This element represents the percentage of the investment subject to daily redemption. Percentage of Monthly Redemption Percentage of Monthly Redemption This element represents the percentage of the investment subject to monthly redemption. Percentage of Quarterly Redemption Percentage of Quarterly Redemption This element represents the percentage of the investment subject to quarterly redemption. Percentage Subject to Lock in Period Percentage Subject to Lock in Period This element represents the percentage of the investment subject to lock-up or side pocket provisions. Noncontrolling Interest [Abstract] Net Income (Loss) Attributable to Noncontrolling Interests [Table Text Block] Net Income (Loss) Attributable to Noncontrolling Interests [Table Text Block] Reconciliation of components of Net Income (Loss) Attributable to Noncontrolling Interests [Table Text Block] Redeemable Noncontrolling Interest [Table Text Block] Redeemable Noncontrolling Interest [Table Text Block] Share-based Compensation [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Range [Axis] Exercise Price Range [Axis] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain] Range of exercise price, 14.81 - 25.00 [Member] Range of exercise price, 14.81 - 25.00 [Member] [Member] Range of exercise price of LM Stock options of 14.81 - 25.00 [Member] Range of exercise price, 25.01 - 35.00 [Member] Range of exercise price, 25.01 - 35.00 [Member] Represents the range of exercise price in dollars per share from $ 25.01 to 35.00 for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards. Range of exercise price, 35.01 - 55.18 [Member] Range of exercise price, 35.01 - 55.18 [Member] Represents the range of exercise price in dollars per share from $35.01 to $55.18 for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards. Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Employee Stock Option Employee Stock Option [Member] Stock based compensation disclosure Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Goodwill and Intangible Assets Disclosure [Abstract] Fair Value Inputs, Assets, Quantitative Information [Table] Fair Value Inputs, Assets, Quantitative Information [Table] Weighted Average [Member] Weighted Average [Member] Indefinite-lived Intangible Assets [Axis] Indefinite-lived Intangible Assets [Axis] Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-lived Intangible Assets, Major Class Name [Domain] Permal funds-of-hedge fund management contracts [Member] Permal funds-of-hedge fund management contracts [Member] Related to the Permal funds-of-hedge fund management contracts Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Fair Value, Inputs, Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Fair Value Inputs, Assets, Quantitative Information [Line Items] Fair Value Inputs, Assets, Quantitative Information [Line Items] Fair Value Inputs, Long-term Revenue Growth Rate Fair Value Inputs, Long-term Revenue Growth Rate Fair Value Inputs, Discount Rate Fair Value Inputs, Discount Rate Condensed Income Statement [Table] Condensed Income Statement [Table] Balance Before Consolidation of CIVs Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member] Represents amounts prior to consolidation of consolidated investment entities and eliminations. Eliminations Consolidation, Eliminations [Member] Consolidated Legg Mason, Inc. Consolidated Legg Mason [Domain] The consolidated financial information of the entity, including the portion which relates to consolidated variable interest entities. Condensed Income Statements, Captions [Line Items] Condensed Income Statements, Captions [Line Items] Revenues Revenues Total Operating Expenses Operating Expenses OPERATING INCOME Operating Income (Loss) Total Other Non-Operating Income (Expense) Nonoperating Income (Expense) INCOME BEFORE INCOME TAX PROVISION Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Income tax provision Income Tax Expense (Benefit) NET INCOME Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net Income (Loss) Attributable to Noncontrolling Interest Net Income (Loss) Attributable to Noncontrolling Interest Net Income Attributable to Legg Mason, Inc. Net Income (Loss) Attributable to Parent Commitments and Contingencies Disclosure [Abstract] Schedule Of Future Minimum Rental Payments For Operating Leases Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Lease Liability Reserve Roll Forward [Table Text Block] Other Noncurrent Liabilities [Table Text Block] Schedule of Rent Expense [Table Text Block] Schedule of Rent Expense [Table Text Block] Schedule of Business Acquisitions by Acquisition, Contingent Consideration [Table Text Block] Schedule of Business Acquisitions by Acquisition, Contingent Consideration [Table Text Block] Schedule of Lease Reserve Liability Rollforward [Table] Schedule of Lease Reserve Liability Rollforward [Table] Displays the rollforward change in the balanced initially created by reserving space related to real estate abandonments Restructuring Type [Axis] Restructuring Type [Axis] Type of Restructuring [Domain] Type of Restructuring [Domain] Commitments Related to Vacated Space that Remains Vacant [Member] Commitments Related to Vacated Space that Remains Vacant [Member] Portion of the lease reserve liability balance that has been permanently vacated by Legg Mason and has yet to be subleased by a third party EnTrustPermal [Member] EnTrustPermal [Member] New affiliate created from the acquisition of EnTrust and merging Permal into it to create a newly branded affiliate, EnTrustPermal. QS Investors [Domain] QS Investors [Domain] QS Investors [Domain] Other Commitments [Axis] Other Commitments [Axis] Other Commitments [Domain] Other Commitments [Domain] Vacated Office Space [Member] Vacated Office Space [Member] Total lease reserve liability related to space permanently vacated by Legg Mason Schedule of Lease Reserve Liability Rollforward [Line Items] Schedule of Lease Reserve Liability Rollforward [Line Items] [Line Items] for Displays the rollforward change in the balanced initially created by reserving space related to real estate abandonments Lease Liability Related To Space Permanentely Abandonded Valuation Allowances and Reserves, Balance Valuation Allowances and Reserves, Charged to Cost and Expense Valuation Allowances and Reserves, Charged to Cost and Expense Rental Payments, Net of Sublease Income Valuation Allowances and Reserves, Deductions Adjustments to Lease Liability Related to Vacant Space Valuation Allowances and Reserves, Adjustments Loss Contingency Accrual Loss Contingency Accrual Loss Contingency Accrual, Provision Loss Contingency Accrual, Provision Loss Contingency, Receivable, Receipts Loss Contingency, Receivable, Receipts Debt Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosures [Table] Derivative Instruments and Hedging Activities Disclosures [Table] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent Event [Member] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving Credit Facility [Member] Revolving Credit Facility [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] 2.7% Senior Notes [Member] 2.7% Senior Notes [Member] 2.7% Senior Notes Due July 2019 [Member] Other Income [Member] Other Income [Member] Other Expense [Member] Other Expense [Member] Interest Expense [Member] Interest Expense [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Other Assets [Member] Other Assets [Member] Derivative, by Nature [Axis] Derivative, by Nature [Axis] Derivative, Name [Domain] Derivative, Name [Domain] Interest Rate Swap [Member] Interest Rate Swap [Member] Legal Entity [Axis] Entity [Domain] Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member] Derivative Instruments and Hedging Activities Disclosures [Line Items] Derivative Instruments and Hedging Activities Disclosures [Line Items] Derivative, Maturity Date Derivative, Maturity Date Derivative, Fixed Interest Rate Derivative, Fixed Interest Rate Derivative, Notional Amount Derivative, Notional Amount Derivative Instruments in Hedges, Assets, at Fair Value Derivative Instruments in Hedges, Assets, at Fair Value Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Change in Unrealized Gain (Loss) Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Change in Unrealized Gain (Loss) Derivative, Gain on Derivative Derivative, Gain on Derivative Debt Instrument, Fair Value Disclosure Debt Instrument, Fair Value Disclosure Reconciliation of Income Tax Rate [Abstract] Reconciliation of Income Tax Rate [Abstract] Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Effective Income Tax Rate Reconciliation, Uncertain Tax Benefits Effective Income Tax Rate Reconciliation, Uncertain Tax Benefits Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to uncertain tax benefits. Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Percent Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Percent Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Effective Income Tax Rate Reconciliation, Percent Effective Income Tax Rate Reconciliation, Percent Tax Benefit, Impairment of Intangible Assets, Indefinite Lived (Excluding Goodwill) Tax Benefit, Impairment of Intangible Assets, Indefinite Lived (Excluding Goodwill) Tax Benefit, Impairment of Intangible Assets, Indefinite Lived (Excluding Goodwill) Statement of Financial Position [Abstract] Statement [Table] Statement [Table] Consolidated Investment Vehicles [Member] Statement [Line Items] Statement [Line Items] Common Stock, Par or Stated Value Per Share Common Stock, Par or Stated Value Per Share ASSETS Assets [Abstract] Current Assets Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Restricted cash Restricted Cash and Cash Equivalents, Current Receivables: Receivables, Net, Current [Abstract] Investment advisory and related fees Accounts Receivable, Net, Current Other receivables Other Receivables, Net, Current Investment securities Short-term Investments Deferred income taxes Deferred Tax Assets, Net of Valuation Allowance, Current Other current assets Other Assets, Current Total Current Assets Assets, Current Fixed assets, net Property, Plant and Equipment, Net Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Goodwill Goodwill Deferred income taxes Deferred Tax Assets, Net of Valuation Allowance, Noncurrent Other non-current assets Other Assets, Noncurrent TOTAL ASSETS Assets LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities and Equity [Abstract] LIABILITIES Liabilities [Abstract] Current Liabilities Liabilities, Current [Abstract] Accrued compensation Employee-related Liabilities, Current Accounts Payable and Accrued Liabilities, Current Accounts Payable and Accrued Liabilities, Current Short-term borrowings Line of Credit, Current Business Combination, Contingent Consideration, Liability, Current Business Combination, Contingent Consideration, Liability, Current Other current liabilities Other Liabilities, Current Total Current Liabilities Liabilities, Current Deferred compensation Deferred Compensation Liability, Classified, Noncurrent Deferred income taxes Deferred Tax Liabilities, Net, Noncurrent Business Combination, Contingent Consideration, Liability, Noncurrent Business Combination, Contingent Consideration, Liability, Noncurrent Other non-current liabilities Other Liabilities, Noncurrent Long-term Debt Long-term Debt, Excluding Current Maturities TOTAL LIABILITIES Liabilities REDEEMABLE NONCONTROLLING INTERESTS Redeemable Noncontrolling Interest, Equity, Carrying Amount STOCKHOLDERS' EQUITY Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Common stock, par value $.10; authorized 500,000,000 shares; issued 107,700,310 shares in December 2015 and 111,469,142 shares in March 2015 Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Employee stock trust Common Stock Issued, Employee Stock Trust Deferred compensation employee stock trust Compensation and Benefits Trust Retained earnings Retained Earnings, Unappropriated AOCI Including Portion Attributable to Noncontrolling Interest, before Tax AOCI Including Portion Attributable to Noncontrolling Interest, before Tax TOTAL STOCKHOLDERS' EQUITY Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Stockholders' Equity Attributable to Parent Stockholders' Equity Attributable to Parent Stockholders' Equity Attributable to Noncontrolling Interest Stockholders' Equity Attributable to Noncontrolling Interest TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities and Equity Common Stock, Shares Authorized Common Stock, Shares Authorized Common Stock, Shares, Issued Common Stock, Shares, Issued Noncontrolling Interest Disclosure [Text Block] Noncontrolling Interest Disclosure [Text Block] Statement of Cash Flows [Abstract] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Noncontrolling Interest [Member] Noncontrolling Interest [Member] Fair Value Adjustment, by Type [Axis] Fair Value Adjustment, by Type [Axis] Will be used to distinguish between the different reasons for the change in the fair value of an asset or liability. Examples include, foreign exchange, Change in Assumptions, etc. Fair Value Adjustment, by Type [Domain] Fair Value Adjustment, by Type [Domain] [Domain] for Will be used to distinguish between the different reasons for the change in the fair value of an asset or liability. Examples include, foreign exchange, Change in Assumptions, etc. Change in Input Assumptions [Member] Change in Input Assumptions [Member] Represents changes in the fair value of an asset or liability resulting from changes in the inputs used to determine the fair value of the asset or liability. Nature of Expense [Axis] Nature of Expense [Axis] Interim Period, Costs Not Allocable [Domain] Interim Period, Costs Not Allocable [Domain] Make Whole Premium [Member] Make Whole Premium [Member] Premium paid related to an early repayment of long-term debt 5.5% Senior Notes [Member] 5.5% Senior Notes [Member] 5.5% Senior Notes Income Taxes Paid, Net Income Taxes Paid, Net Interest Paid Interest Paid CASH FLOWS FROM OPERATING ACTIVITIES Net Cash Provided by (Used in) Operating Activities [Abstract] Net Income Payments of Debt Extinguishment Costs Payments of Debt Extinguishment Costs Adjustments to reconcile Net Income to net cash used in operations: Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) Depreciation and amortization Depreciation and Amortization Excluding Amortization of Deferred Sales Commissions The aggregate amount of depreciation expense and amortization expense. Depreciation expense is the noncash expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Amortization expense is the noncash expense charged against earnings in the current period that reflects the allocation of the cost of definite lived intangible assets and leasehold improvements over the shorter of their estimated remaining economic lives or the lease term. Excludes the amortization of deferred sales commissions. Accretion and amortization of securities discounts and premiums, net Accretion (Amortization) of Discounts and Premiums, Investments Stock-based compensation Share-based Compensation Net (gains) losses on investments Gain (Loss) on Investments Deferred income taxes Deferred Income Tax Expense (Benefit) Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Other Other Noncash Income (Expense) Decrease (increase) in assets: Increase (Decrease) in Operating Assets [Abstract] Investment advisory and related fees receivable Increase (Decrease) in Accounts Receivable Net (purchases) sales of trading and other current investments Proceeds from (Payments for) Trading Securities, Short-term Other receivables Increase (Decrease) in Other Receivables Other assets Increase (Decrease) in Other Operating Assets Increase (decrease) in liabilities: Increase (Decrease) in Operating Liabilities [Abstract] Accrued compensation Increase (Decrease) in Employee Related Liabilities Deferred compensation Increase (Decrease) in Deferred Compensation Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Other liabilities Increase (Decrease) in Other Operating Liabilities CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES Net Cash Provided by (Used in) Operating Activities, Continuing Operations CASH FLOWS FROM INVESTING ACTIVITIES Net Cash Provided by (Used in) Investing Activities [Abstract] Payments for fixed assets Payments to Acquire Property, Plant, and Equipment Business acquisitions, net of cash acquired of $29,830 Payments to Acquire Businesses, Net of Cash Acquired Proceeds from Sales of Assets, Investing Activities Proceeds from Sales of Assets, Investing Activities Cash Acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents Change in restricted cash Increase (Decrease) in Restricted Cash Purchases of investment securities Payments to Acquire Marketable Securities Proceeds from sales and maturities of investment securities Proceeds from Sale and Maturity of Marketable Securities CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES Net Cash Provided by (Used in) Investing Activities CASH FLOWS FROM FINANCING ACTIVITIES Net Cash Provided by (Used in) Financing Activities [Abstract] Proceeds from Lines of Credit Proceeds from Lines of Credit Repayment of long-term debt Repayments of Long-term Debt Business Acquisition, Preacquisition Contingency, Amount of Settlement Business Acquisition, Preacquisition Contingency, Amount of Settlement Proceeds from issuance of long-term debt Proceeds from Issuance of Long-term Debt Debt issuance costs Payments of Debt Issuance Costs Issuance of common stock for stock-based compensation Proceeds from Issuance of Common Stock Employee Tax Withholdings by settlement of net share transaction Employee Tax Withholdings Related to net share transaction Employee Tax Withholdings Related to net share transactions Repurchase of common stock Payments for Repurchase of Common Stock Dividends paid Payments of Dividends Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Net subscriptions received from noncontrolling interests Proceeds from (Payments to) Noncontrolling Interests CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES Net Cash Provided by (Used in) Financing Activities EFFECT OF EXCHANGE RATES ON CASH Effect of Exchange Rate on Cash and Cash Equivalents NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS Cash and Cash Equivalents, Period Increase (Decrease) CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR CASH AND CASH EQUIVALENTS AT END OF YEAR Proceeds from Income Tax Refunds Proceeds from Income Tax Refunds Business Combinations [Abstract] RARE Management Team [Member] RARE Management Team [Member] After the acquisition of RARE Infrastructure the RARE Management Team will maintain a noncontrolling interest in the company. Outside Investors Outside Investors [Member] This is a group of external companies that are non-controlling partners of, and have retained an ownership in, RARE Infrastructure, an affiliate of Legg Mason, Inc RARE Infrastructure, Ltd [Member] RARE Infrastructure, Ltd [Member] Related to information related specifically to our affiliate, RARE Infrastructure Assets Under Management Assets under Management, Carrying Amount Line of Credit Facility, Fair Value of Amount Outstanding Line of Credit Facility, Fair Value of Amount Outstanding Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table] Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table] Other changes in Fair Value [Member] Other changes in Fair Value [Member] Represents changes in the fair value of assets or liabilities caused by changes in exchange rates, accretion and other miscellaneous adjustments Fair Value Inputs, Market Data Inputs, Variables, by Type [Axis] Fair Value Inputs, Market Data Inputs, Variables, by Type [Axis] Contains the different types of variables that were used to calculate the Contingent Consideration Fair Value Inputs, Market Data Inputs, Variables, by Type [Domain] Fair Value Inputs, Market Data Inputs, Variables, by Type [Domain] [Domain] for Contains the different types of variables that were used to calculate the Contingent Consideration Assets Under Management [Member] Assets Under Management [Member] Market Input used to calculate the fair value of the contingent consideration. Performance Fees [Member] Performance Fees [Member] Market Input used to calculate the fair value of the contingent consideration. Earn-out Payments [Member] Earn-out Payments [Member] Market Input used to calculate the fair value of the contingent consideration. Asset Class [Axis] Asset Class [Axis] Asset Class [Domain] Asset Class [Domain] Fund management contracts [Member] Fund management contracts [Member] Represents fund management contracts member. Asset Management Contracts Assets management contracts [Member] Represents amortizable asset management contracts member. Martin Currie [Member] Martin Currie [Member] An affiliate, Martin Currie, that is a leading international equity specialist based in Edinburgh, Scotland. Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] Fair Value Input, Projected Cash Flow Growth Rate, Low End of Range Fair Value Input, Projected Cash Flow Growth Rate, Low End of Range Percentage of assumed growth rate in projected cash flows, used as an input to measure fair value, low end of range Fair Value Input, Projected Cash Flow Growth Rate, High End of Range Fair Value Input, Projected Cash Flow Growth Rate, High End of Range Percentage of assumed growth rate in projected cash flows, used as an input to measure fair value, high end of range Fair Value Input, Projected Cash Flow Growth Rate, Average Fair Value Input, Projected Cash Flow Growth Rate, Average Percentage of assumed growth rate in projected cash flows, used as an input to measure fair value, average Fair Value Assumptions, Weighted Average Volatility Rate Fair Value Assumptions, Weighted Average Volatility Rate Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Fair Value Inputs, Long-term AUM Growth Rate Fair Value Inputs, Long-term AUM Growth Rate Percentage of assumed long-term growth in AUM, used as an input to measure fair value. Fair Value Inputs, Attrition Rate Fair Value Inputs, Attrition Rate Amount used to represent the attrition when calculating the fair value of amortizable asset management contracts Business Combination, Contingent Consideration, Liability Business Combination, Contingent Consideration, Liability Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Revenues Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative [Table] Derivative [Table] Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Designated as Hedging Instrument [Member] Designated as Hedging Instrument [Member] Not Designated as Hedging Instrument [Member] Not Designated as Hedging Instrument [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Foreign Exchange Forward [Member] Foreign Exchange Forward [Member] Future [Member] Future [Member] Forward Contracts [Member] Forward Contracts [Member] Derivative Derivative [Line Items] Derivative Asset, Fair Value, Gross Asset Derivative Asset, Fair Value, Gross Asset Derivative Asset, Fair Value, Gross Liability Derivative Asset, Fair Value, Gross Liability Derivative Asset Derivative Asset Derivative Asset, Not Subject to Master Netting Arrangement Derivative Asset, Not Subject to Master Netting Arrangement Derivative Asset, Collateral, Obligation to Return Cash, Offset Derivative Asset, Collateral, Obligation to Return Cash, Offset Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Title of Individual [Axis] Title of Individual [Axis] Relationship to Entity [Domain] Relationship to Entity [Domain] Management [Member] Management [Member] Chief Executive Officer [Member] Chief Executive Officer [Member] Key Employees [Member] Key Employees [Member] Employees that are important to the operations of Legg Mason. Share-based Compensation Arrangement by Share-based Payment Award Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding [Table Text Block] Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding [Table Text Block] Assumptions used to determine the weighted-average fair value of option grants Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Fauchier [Member] Fauchier [Member] Balances related to the acquisition of Fauchier Partners. Contingent Consideration by Type [Axis] Contingent Consideration by Type [Axis] Contingent Consideration Type [Domain] Contingent Consideration Type [Domain] Contingent Payment due on fourth anniversary of acquisition Contingent payment due on fourth anniversary of acquisition [Member] Contingent payment due on fourth anniversary of acquisition. Business Acquisition, Preacquisition Contingency, Amount of Settlement Equity [Abstract] Common Stock, Shares, Outstanding Common Stock, Shares, Outstanding Stock Issued During Period, Shares, Share-based Compensation, Gross Stock Issued During Period, Shares, Share-based Compensation, Gross Stock Issued During Period, Shares, Employee Benefit Plan Stock Issued During Period, Shares, Employee Benefit Plan Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Stock Repurchased and Retired During Period, Shares Stock Repurchased and Retired During Period, Shares Shares Paid for Tax Withholding for Share Based Compensation Shares Paid for Tax Withholding for Share Based Compensation Schedule of Variable Interest Entities [Table] Variable Interest Entity Variable Interest Entity [Line Items] Current Assets Non-current Assets Assets, Noncurrent TOTAL ASSETS Current Liabilities Non-current Liabilities Liabilities, Noncurrent TOTAL LIABILITIES Total Stockholders' Equity TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY Subsequent Events [Abstract] Subsequent Event [Table] Subsequent Event [Table] Management Equity Plan [Member] Management Equity Plan [Member] A plan that allows the key employees of an affiliate to participate in the future growth of the enterprise value subsequent to the date of grant. Clarion Partners [Member] Clarion Partners [Member] Clarion Partners is a newly acquired company that will be a stand alone affiliate once integrated into Legg Mason. Clarion Management Team [Member] Clarion Management Team [Member] After the acquisition of Clarion Partners, the Clarion Management Team will maintain a noncontrolling interest in the company. Subsequent Event [Line Items] Subsequent Event [Line Items] Co-Investments Co-Investments These are amounts agreed to contribute into Clarion Partners after acquisition as a co-investment of their currently held investments at the time of purchase. Profits interests equity plan participation percentage Profits interests equity plan participation percentage Represents the percentage of participation in future growth in value of the affiliate available for participation by key employees under the terms of a profits interest management equity plan. Business Combination, Acquisition Related Costs Business Combination, Acquisition Related Costs Employee Benefits [Abstract] Employee Benefits [Abstract] Compensation and Employee Benefit Plans [Text Block] Compensation and Employee Benefit Plans [Text Block] Gregg S. Hymowitz [Member] Gregg S. Hymowitz [Member] Gregg S. Hymowitz is the Co-Founder of EnTrust, a newly acquired affiliate and will remain a noncontrolling interest holder post acquisition. EnTrust Capital [Member] EnTrust Capital [Member] Newly acquired affiliate that will immediately become EnTrustPermal. Assets Under Advisement, Carrying Amount Assets Under Advisement, Carrying Amount Represents the carrying amount of assets that an asset manager advises on behalf of investors. Restructuring Charges Restructuring Charges Accounting Policies [Abstract] Basis of Presentation and Significant Accounting Policies [Text Block] Basis of Presentation and Significant Accounting Policies [Text Block] Use of Estimates, Policy [Policy Text Block] Use of Estimates, Policy [Policy Text Block] Consolidation, Policy [Policy Text Block] Consolidation, Policy [Policy Text Block] Consolidation, Variable Interest Entity, Policy [Policy Text Block] Consolidation, Variable Interest Entity, Policy [Policy Text Block] Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Investment, Policy [Policy Text Block] Investment, Policy [Policy Text Block] Derivatives, Policy [Policy Text Block] Derivatives, Policy [Policy Text Block] Fair Value of Financial Instruments, Policy [Policy Text Block] Fair Value of Financial Instruments, Policy [Policy Text Block] Appropriated Retained Earnings [Policy Text Block] Appropriated Retained Earnings [Policy Text Block] Disclosure of accounting policy for the segregation of retained earnings for consolidated investment vehicles. Retained earnings may be appropriated for loss contingencies and are unavailable for dividend distribution. Property, Plant and Equipment, Policy [Policy Text Block] Property, Plant and Equipment, Policy [Policy Text Block] Goodwill and Intangible Assets, Policy [Policy Text Block] Goodwill and Intangible Assets, Policy [Policy Text Block] Debt, Policy [Policy Text Block] Debt, Policy [Policy Text Block] Contingent Liability Reserve Estimate, Policy [Policy Text Block] Contingent Liability Reserve Estimate, Policy [Policy Text Block] Foreign Currency Transactions and Translations Policy [Policy Text Block] Foreign Currency Transactions and Translations Policy [Policy Text Block] Management and Investment Advisory Fees, Policy [Policy Text Block] Management and Investment Advisory Fees, Policy [Policy Text Block] Revenue Recognition, Services, Refundable Fees for Services [Policy Text Block] Revenue Recognition, Services, Refundable Fees for Services [Policy Text Block] Revenue Recognition, Deferred Revenue [Policy Text Block] Revenue Recognition, Deferred Revenue [Policy Text Block] Income Tax, Policy [Policy Text Block] Income Tax, Policy [Policy Text Block] Commitments and Contingencies, Policy [Policy Text Block] Commitments and Contingencies, Policy [Policy Text Block] Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Earnings Per Share, Policy [Policy Text Block] Earnings Per Share, Policy [Policy Text Block] Costs Associated with Exit or Disposal Activities or Restructurings, Policy [Policy Text Block] Costs Associated with Exit or Disposal Activities or Restructurings, Policy [Policy Text Block] Noncontrolling Interests Redeemable [Policy Text Block] Noncontrolling Interests Redeemable [Policy Text Block] Disclosure of accounting policy for redeemable noncontrolling interests related to consolidated investment funds. Related Parties [Policy Text Block] Related Parties [Policy Text Block] Disclosure of accounting policy for related parties related to investment funds. New Accounting Pronouncements, Policy [Policy Text Block] New Accounting Pronouncements, Policy [Policy Text Block] Pension Disclosure [Abstract] Pension Disclosure [Abstract] Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block] Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block] Schedule of Changes in Projected Benefit Obligations [Table Text Block] Schedule of Changes in Projected Benefit Obligations [Table Text Block] Schedule of Changes in Fair Value of Plan Assets [Table Text Block] Schedule of Changes in Fair Value of Plan Assets [Table Text Block] Schedule of Net Benefit Costs [Table Text Block] Schedule of Net Benefit Costs [Table Text Block] Schedule of Expected Benefit Payments [Table Text Block] Schedule of Expected Benefit Payments [Table Text Block] Schedule of Long-term Debt Instruments [Table Text Block] Schedule of Long-term Debt Instruments [Table Text Block] Comprehensive Income (Loss) Note [Text Block] Comprehensive Income (Loss) Note [Text Block] Foreign currency translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments and Tax Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments and Tax Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax Mergers, Acquisitions and Dispositions Disclosures [Text Block] Mergers, Acquisitions and Dispositions Disclosures [Text Block] Earnings Per Share [Abstract] Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Trade Names Trade Names [Member] Other Fund Management Contracts [Member] Other Fund Management Contracts [Member] Other Fund Management Contracts [Member] Business Combination, Consideration Transferred Business Combination, Consideration Transferred Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value Business Combination, Total Entity Value Business Combination, Total Entity Value This is the total value of an entity that was acquired. It is equal to the Total consideration that was transfered plus the fair value of the noncontrolling interests at the time of the acquisition. Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Schedule of Stock by Class [Table Text Block] Schedule of Stock by Class [Table Text Block] Income Statement [Abstract] Restructuring Charges [Member] Restructuring Charges [Member] Non Restructuring Related [Member] Non Restructuring Related [Member] Compensation and benefits expenses that were not related to a restructuring initiative Separate Accounts [Member] Separate Accounts [Member] A member of the Investment Type axis to segregate out the portion of assets, revenue, etc that is related to Separate Accounts Mutual Funds [Member] Mutual Funds [Member] This is a member of the Investment Type axis and is used to segregate out the portion of assets, revenues, etc related to Mutuals Funds OPERATING REVENUES Revenues [Abstract] Investment Advisory Fees Investment Advisory Fees Distribution and service fees Distribution and Servicing Fees Other Revenue, Other Financial Services OPERATING EXPENSES Costs and Expenses [Abstract] Compensation and benefits Labor and Related Expense Distribution and servicing Noninterest Expense Distribution and Servicing Fees Communications and technology Communications and Information Technology Occupancy Occupancy, Net Amortization of intangible assets Amortization of Intangible Assets Other Other Expenses Total Operating Expenses OPERATING INCOME OTHER NON-OPERATING INCOME (EXPENSE) Nonoperating Income (Expense) [Abstract] Interest income Investment Income, Interest Interest expense Interest Expense Other income (expense), net Other Nonoperating Income (Expense) INCOME BEFORE INCOME TAX PROVISION NET INCOME NET INCOME ATTRIBUTABLE TO LEGG MASON, INC. NET INCOME PER SHARE ATTRIBUTABLE TO LEGG MASON, INC. COMMON SHAREHOLDERS Basic (in dollars per share) Earnings Per Share, Basic Diluted (in dollars per share) Earnings Per Share, Diluted Common Stock, Dividends, Per Share, Declared Common Stock, Dividends, Per Share, Declared Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] US Treasury Interest Rate [Member] US Treasury Interest Rate [Member] Interest rate at which a bank borrows funds from other banks in the United States interbank market. Non-Cash Write-off [Member] Non-Cash Write-off [Member] The portion of an expense related to the early payment of long-term debt that is being written off of the balance sheet and taken as an expense. 2.5% Convertible Senior Notes [Member] 2.5% Convertible Senior Notes [Member] 2.5% Convertible Senior Notes [Member] 3.95% Senior Notes [Member] 3.95% Senior Notes [Member] 3.95% Senior Notes due July 2024 [Member] 4.75% Senior Notes [Member] 4.75% Senior Notes [Member] 4.75% Senior Notes [Member] 5.625% Senior Notes [Member] 5.625% Senior Notes [Member] [Member] 5.625% Senior Notes [Member] 6.375% Junior Notes [Member] 6.375% Junior Notes [Member] 6.375% Junior Notes [Member] Five-year term loan [Member] Five-year term loan [Member] Five-year term loan [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Long-term Debt, Gross Long-term Debt, Gross Debt Instrument, Unamortized Premium Debt Instrument, Unamortized Premium Debt Instrument, Interest Rate, Stated Percentage Debt Instrument, Interest Rate, Stated Percentage Proceeds from Issuance of Debt Proceeds from Issuance of Debt Repayments of Debt Repayments of Debt Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss) Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss) Debt Instrument, Unamortized Discount Debt Instrument, Unamortized Discount Unamortized Debt Issuance Expense Unamortized Debt Issuance Expense Long-term Debt, Maturities, Repayments of Principal in Year Five Long-term Debt, Maturities, Repayments of Principal in Year Four Long-term Debt, Maturities, Repayments of Principal after Year Five Long-term Debt, Maturities, Repayments of Principal after Year Five Debt Instrument, Basis Spread on Variable Rate Debt Instrument, Basis Spread on Variable Rate Operating Leases, Rent Expense Operating Leases, Rent Expense Operating Leases, Rent Expense, Sublease Rentals Operating Leases, Rent Expense, Sublease Rentals Operating Leases, Rent Expense, Net Operating Leases, Rent Expense, Net Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Treasury Lock [Member] Treasury Lock [Member] Other Nonoperating Income (Expense) [Member] Other Nonoperating Income (Expense) [Member] Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments Not Designated as Hedging Instruments, Gain Derivative Instruments Not Designated as Hedging Instruments, Gain Derivative Instruments Not Designated as Hedging Instruments, Loss Derivative Instruments Not Designated as Hedging Instruments, Loss Derivative, Loss on Derivative Derivative, Loss on Derivative Intangible Assets and Goodwill Goodwill and Intangible Assets Disclosure [Text Block] Other Noncurrent Assets [Member] Other Noncurrent Assets [Member] Other Current Assets [Member] Other Current Assets [Member] Debt Instrument [Line Items] Consolidated Investment Vehicles and Other Variable Interest Entities Disclosure [Text Block] Variable Interest Entity Disclosure [Text Block] Property, Plant and Equipment [Abstract] Components of fixed assets Property, Plant and Equipment [Table Text Block] Income Tax Disclosure [Abstract] Unrecognized Tax Benefits [Table] Unrecognized Tax Benefits [Table] Amounts related to unrecognized tax benefits. Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] NEW YORK NEW YORK Stockholders' Equity, Total [Member] Stockholders' Equity, Total [Member] Valuation Allowances and Reserves Type [Axis] Valuation Allowances and Reserves Type [Axis] Valuation Allowances and Reserves [Domain] Valuation Allowances and Reserves [Domain] Previously Unrecognized [Member] Previously Unrecognized [Member] Represents the portion of a tax that was previously unrecognized in prior periods but is now able to be recognized in this period Unrecognized Tax Benefits [Line Items] Unrecognized Tax Benefits [Line Items] Unrecognized Tax Benefits [Line Items] Unrecognized Tax Benefits Unrecognized Tax Benefits Unrecognized Tax Benefits that Would Impact Effective Tax Rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Dividends Payable Dividends Payable Share-based Compensation Arrangements by Share-based Payment Award Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Stock Compensation Plan Stock Compensation Plan [Member] Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Share-based Compensation Arrangement by Share-based Payment Award Granted Price as Percentage of Fair Market Value Minimum Share-based Compensation Arrangement by Share-based Payment Award Granted Price as Percentage of Fair Market Value Minimum Represents the minimum price as a percentage of the fair market value, at which options will be granted. Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Discontinued Operations and Disposal Groups [Abstract] Proceeds from Sales of Business, Affiliate and Productive Assets Proceeds from Sales of Business, Affiliate and Productive Assets Reconciliation of Tax Rate [Table] Reconciliation of Tax Rate [Table] Schedule reconcilling the difference between the federal tax rate and the effective tax rate UNITED KINGDOM UNITED KINGDOM Reconciliation of Tax Rate [Line Items] Reconciliation of Tax Rate [Line Items] [Line Items] for Schedule reconcilling the difference between the federal tax rate and the effective tax rate Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount Stockholders' Equity Note Disclosure [Text Block] Stockholders' Equity Note Disclosure [Text Block] Segment Reporting [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] UNITED STATES UNITED STATES Other Segments [Member] Other Segments [Member] Subsegments [Axis] Subsegments [Axis] Subsegments [Domain] Subsegments [Domain] Subsegments Consolidation Items [Axis] Subsegments Consolidation Items [Axis] Subsegments Consolidation Items [Domain] Subsegments Consolidation Items [Domain] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Intangible Assets, Net (Including Goodwill) Intangible Assets, Net (Including Goodwill) Other Commitments [Table] Other Commitments [Table] Permal [Member] Permal [Member] Represents the acquired business of Permal. Other Commitments [Line Items] Other Commitments [Line Items] Redeemable Noncontrolling Interest Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Share-based Liabilities Paid Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Share-based Liabilities Paid Fair Value Disclosures [Abstract] Fair Value, Assets, Level 1 to Level 2 Transfers, Amount Fair Value, Assets, Level 1 to Level 2 Transfers, Amount Fair Value, Assets, Level 2 to Level 1 Transfers, Amount Fair Value, Assets, Level 2 to Level 1 Transfers, Amount Fair Value, Liabilities, Level 1 to Level 2 Transfers, Amount Fair Value, Liabilities, Level 1 to Level 2 Transfers, Amount Fair Value, Liabilities, Level 2 to Level 1 Transfers, Amount Fair Value, Liabilities, Level 2 to Level 1 Transfers, Amount Held-to-maturity Securities, Fair Value Held-to-maturity Securities, Fair Value Significant Accounting Policies Significant Accounting Policies [Text Block] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Property, Plant and Equipment by Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment Property, Plant and Equipment [Line Items] Depreciation and amortization Depreciation, Depletion and Amortization Accelerated Depreciation, Other Accelerated Depreciation, Other Amount of accelerated depreciation charged against earnings that is for purposes other than restructuring. Details of Repatriation of Foreign Earnings [Table] Details of Repatriation of Foreign Earnings [Table] Details of Repatriation of Foreign Earnings [Table] Foreign Tax Authority [Member] Foreign Tax Authority [Member] Details of Repatriation of Foreign Earnings [Line Items] Details of Repatriation of Foreign Earnings [Line Items] [Line Items] for Details of Repatriation of Foreign Earnings [Table] Cash Cash Retained Earnings (Accumulated Deficit) Retained Earnings (Accumulated Deficit) Line of Credit Facility, Current Borrowing Capacity Line of Credit Facility, Current Borrowing Capacity Subsequent Events [Text Block] Subsequent Events [Text Block] PK Investments [Member] PK Investments [Member] To distinguish the activity of PK Investments related to its acquisitions from the activity of other newly acquired affiliates. Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Class of Stock [Line Items] Class of Stock [Line Items] Preferred Stock, Shares Authorized Preferred Stock, Shares Authorized Common Stock, Capital Shares Reserved for Future Issuance Common Stock, Capital Shares Reserved for Future Issuance Stock Repurchase Program, Authorized Amount Stock Repurchase Program, Authorized Amount Stock Repurchase Program, Remaining Authorized Repurchase Amount Stock Repurchase Program, Remaining Authorized Repurchase Amount Stock Repurchased and Retired During Period, Shares Stock Repurchased and Retired During Period, Value Stock Repurchased and Retired During Period, Value Class of Warrant or Right, Number of Securities Called by Warrants or Rights Class of Warrant or Right, Number of Securities Called by Warrants or Rights Schedule of Business Acquisitions by Acquisition, Contingent Consideration [Table] Schedule of Business Acquisitions by Acquisition, Contingent Consideration [Table] Business Acquisition, Contingent Consideration [Line Items] Business Acquisition, Contingent Consideration [Line Items] Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Contingent Liability Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Contingent Liability Derivatives and Hedging Derivative Instruments and Hedging Activities Disclosure [Text Block] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Antidilutive shares due to proceeds from exercising exceeded price of shares [Domain] Antidilutive shares due to proceeds from exercising exceeded price of shares [Domain] Antidilutive shares due to proceeds from exercising exceeded price of shares [Domain] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Stock-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Fair Value Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Table] Fair Value Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Table] Summarization of information required and determined to be provided for purposes of reconciling beginning and ending balances of fair value measurements of assets and liabilities using significant unobservable inputs (Level 3). Collateralized Debt Obligations [Member] Collateralized Debt Obligations [Member] Fair Value Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items] Fair Value Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items] Fair Value Assets and Liabilities Measured on Recurring Basis Financial Statement Unobservable Input Level 3 Fair Value Assets and Liabilities Measured on Recurring Basis, Financial Statement Roll Forward, Unobservable Input, Level 3 [Abstract] Fair Value Assets and Liabilities Measured on Recurring Basis, Financial Statement Roll Forward, Unobservable Input, Level 3 [Abstract] ASSETS: Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Assets measured at fair value using significant unobservable inputs, value at beginning of period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Redemptions/Settlements/Other Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Transfers, Net Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net Realized and unrealized gains/(losses), net Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Assets measured at fair value using significant unobservable inputs, value at end of period LIABILITIES: Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Liabilities measured at fair value using significant unobservable inputs, value at beginning of period Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales Redemptions/Settlements/Other Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements Transfers, Net Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net Realized and unrealized gains/(losses), net Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Liabilities measured at fair value using significant unobservable inputs, value at end of period Total realized and unrealized gains (losses), net Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings Unrealized gains (losses) on Level 3 assets and liabilities still held at the reporting date Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Other Liabilities [Member] Other Liabilities [Member] Derivative, Average Remaining Maturity Derivative, Average Remaining Maturity Amount Net for Fair Value of Derivative Assets and (Liabilities) Derivative Assets (Liabilities), at Fair Value, Net Schedule of Unvested Shares [Table] Schedule of Unvested Shares [Table] The schedule shows the change in unvested shares from the prior period to the current period by number of shares and weighted average price. Schedule of Unvested Shares [Line Items] Schedule of Unvested Shares [Line Items] [Line Items] for The schedule shows the change in unvested shares from the prior period to the current period by number of shares and weighted average price. Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Weighted Average Grant Date Fair Value Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Schedule of Deferred Tax Assets [Table] Schedule of Deferred Tax Assets [Table] A Schedule outlining the components of deferred tax assets and deferred tax liabilities Subsidiaries [Member] Subsidiaries [Member] Domestic Tax Authority [Member] Domestic Tax Authority [Member] State and Local Jurisdiction [Member] State and Local Jurisdiction [Member] Tax Credit Carryforward [Axis] Tax Credit Carryforward [Axis] Tax Credit Carryforward, Name [Domain] Tax Credit Carryforward, Name [Domain] Contribution of Monetary Assets by an Enterprise to a Charitable Organization [Domain] Contribution of Monetary Assets by an Enterprise to a Charitable Organization [Domain] Amount of valuation allowances attributable to deductible charitable contribution carryforwards. Foreign Tax Credit Release [Domain] Foreign Tax Credit Release [Domain] Amount for valuation allowance adjustments attributable to deductible foreign tax credit carryforwards. Valuation Allowance, Operating Loss Carryforwards [Member] Valuation Allowance, Operating Loss Carryforwards [Member] Other Deferred Tax Asset, by Type [Axis] Other Deferred Tax Asset, by Type [Axis] Identifies the types of other deferred tax assets disclosed in the calculation in deferred tax assets Other Deferred Tax Asset, by Type [Domain] Other Deferred Tax Asset, by Type [Domain] [Domain] for Identifies the types of other deferred tax assets disclosed in the calculation in deferred tax assets Federal Benefit of Uncertain Tax Positions [Member] Federal Benefit of Uncertain Tax Positions [Member] Identifies the amount of deferred tax assets arising from uncertain tax positions Fund Launch Costs [Member] Fund Launch Costs [Member] Identifies the amount of deferred tax assets arising from costs to launch new funds Schedule of Deferred Tax Assets [Line Items] Schedule of Deferred Tax Assets [Line Items] [Line Items] for A Schedule outlining the components of deferred tax assets and deferred tax liabilities Deferred Tax Assets, Charitable Contribution Carryforwards Deferred Tax Assets, Charitable Contribution Carryforwards Deferred Tax Assets, Unrealized Losses on Trading Securities Deferred Tax Assets, Unrealized Losses on Trading Securities Deferred Tax Assets, Investment in Subsidiaries Deferred Tax Assets, Investment in Subsidiaries Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities Deferred Tax Assets, Operating Loss Carryforwards Deferred Tax Assets, Operating Loss Carryforwards Deferred Tax Assets, Capital Loss Carryforwards Deferred Tax Assets, Capital Loss Carryforwards Deferred Tax Assets, Tax Credit Carryforwards, Foreign Deferred Tax Assets, Tax Credit Carryforwards, Foreign Deferred Tax Assets, Other Deferred Tax Assets, Other Income Tax Expense (Benefit) Deferred Tax Liabilities, Net Increase (Decrease) in Deferred Liabilities Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions Deferred Tax Assets, Gross Deferred Tax Assets, Gross U.S. Earnings U.S. Earnings Represents the amount of expected future US Earnings required to realized expected Deferred Tax Assets. The estimated amount is as of the balance sheet date Foreign Earnings Foreign Earnings Represents the amount of expected future foreign earnings required to realized expected deferred tax assets. The estimated amount is as of the balance sheet date. Deferred Tax Assets, Valuation Allowance Deferred Tax Assets, Valuation Allowance Valuation Allowances and Reserves, Deductions Deferred Tax Assets, Net of Valuation Allowance Deferred Tax Assets, Net of Valuation Allowance Deferred Tax Liabilities, Goodwill and Intangible Assets Deferred Tax Liabilities, Goodwill and Intangible Assets Deferred Tax Liabilities, Property, Plant and Equipment Deferred Tax Liabilities, Property, Plant and Equipment Deferred Tax Liabilities, Unrealized Gains on Trading Securities Deferred Tax Liabilities, Unrealized Gains on Trading Securities Deferred Tax Liabilities, Investments Deferred Tax Liabilities, Investments Deferred Tax Liabilities, Other Deferred Tax Liabilities, Other Deferred Tax Liabilities, Deferred Expense Deferred Tax Liabilities, Deferred Expense Valuation Allowances and Reserves, Period Increase (Decrease) Valuation Allowances and Reserves, Period Increase (Decrease) Deferred Tax Liabilities, Net Deferred Tax Liabilities, Net Schedule of Variable Interest Entities [Table] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Funds-Of-Hedge Funds [Member] Funds-of-hedge funds [Member] Represents the funds-of-hedge funds category of investment. Other Investments [Member] Other Security Investments [Member] Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments Percentage of Redemption, Investment Funds Percentage of Redemption, Investment Funds This element represents the percentage of the investment funds that are subject to redemption (which may be monthly, quarterly, or annually) and have a remaining term of less than one year. Percentage of Investment of 20 Year Redemption Percentage of Investment of 20 Year Redemption This element represents the percentage of investment having a 20 year redemption period. Fair Value, Investments, Entities that Calculate Net Asset Value, Percent of Total Fair Value, Investments, Entities that Calculate Net Asset Value, Percent of Total The percentage of total assets valued at NAV Investments Remaining Term, High End of Range Investments Remaining Term, High End of Range Investments Remaining Term, High End of Range Investments Remaining Term, Category One Investments Remaining Term, Category One Investments Remaining Term, Category One Investments Remaining Term, Category Two Investments Remaining Term, Category Two Investments Remaining Term, Category Two Schedule of Derivative Assets at Fair Value [Table Text Block] Schedule of Derivative Assets at Fair Value [Table Text Block] Schedule of Derivative Liabilities at Fair Value [Table Text Block] Schedule of Derivative Liabilities at Fair Value [Table Text Block] Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance Derivative Instruments, Gain (Loss) [Table Text Block] Long-term Purchase Commitment [Table] Long-term Purchase Commitment [Table] Category of Item Purchased [Axis] Long-term Purchase Commitment, Category of Item Purchased [Domain] Long-term Purchase Commitment [Line Items] Operating leases Leases [Abstract] 2017 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2018 Operating Leases, Future Minimum Payments, Due in Two Years 2019 Operating Leases, Future Minimum Payments, Due in Three Years 2020 Operating Leases, Future Minimum Payments, Due in Four Years 2021 Operating Leases, Future Minimum Payments, Due in Five Years Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Total Operating Leases, Future Minimum Payments Due Non-employee directors [Abstract] Non-employee directors [Abstract] Current Plan [Member] Current Plan [Member] Refers to plans that are currently in use. Previous Equity Plan for Non-Employee Directors [Member] Previous Equity Plan for Non-Employee Directors [Member] Previous Equity Plan for Non-Employee Directors that expired in July 2015 used to distinguish from the new plan for non-employee directors. Restricted Stock [Member] Restricted Stock [Member] COMMON STOCK Common Stock [Member] Director [Member] Director [Member] Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted Allocated Share-based Compensation Expense Allocated Share-based Compensation Expense Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period Earnings Per Share [Text Block] Earnings Per Share [Text Block] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Bonds [Member] Bonds [Member] Equity [Member] Equity [Member] Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Defined Benefit Plan, Actual Plan Asset Allocations Defined Benefit Plan, Actual Plan Asset Allocations Defined Benefit Plan, Target Plan Asset Allocations Defined Benefit Plan, Target Plan Asset Allocations Defined Benefit Plan, Funded Status of Plan Defined Benefit Plan, Funded Status of Plan Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Defined Benefit Plan, Benefit Obligation Defined Benefit Plan, Benefit Obligation Defined Benefit Plan, Interest Cost Defined Benefit Plan, Interest Cost Defined Benefit Plan, Actuarial Gain (Loss) Defined Benefit Plan, Actuarial Gain (Loss) Defined Benefit Plan, Benefits Paid Defined Benefit Plan, Benefits Paid Defined Benefit Plan, Curtailments Defined Benefit Plan, Curtailments Defined Benefit Plan, Other Changes Defined Benefit Plan, Other Changes Defined Benefit Plan, Fair Value of Plan Assets Defined Benefit Plan, Fair Value of Plan Assets Defined Benefit Plan, Actual Return on Plan Assets Defined Benefit Plan, Actual Return on Plan Assets Defined Benefit Plan, Contributions by Employer Defined Benefit Plan, Contributions by Employer Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets Defined Benefit Plan, Net Periodic Benefit Cost Defined Benefit Plan, Net Periodic Benefit Cost Defined Benefit Plan, Expected Return on Plan Assets Defined Benefit Plan, Expected Return on Plan Assets Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months Defined Benefit Plan, Expected Future Benefit Payments, Year Two Defined Benefit Plan, Expected Future Benefit Payments, Year Two Defined Benefit Plan, Expected Future Benefit Payments, Year Three Defined Benefit Plan, Expected Future Benefit Payments, Year Three Defined Benefit Plan, Expected Future Benefit Payments, Year Four Defined Benefit Plan, Expected Future Benefit Payments, Year Four Defined Benefit Plan, Expected Future Benefit Payments, Year Five Defined Benefit Plan, Expected Future Benefit Payments, Year Five Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter Pension Contributions Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year Schedule of Goodwill [Table] Schedule of Goodwill [Table] Schedule of Goodwill by Book Value [Axis] Schedule of Goodwill by Book Value [Axis] This element represents the disclosures required for goodwill, including gross value, accumulated impairment and net book value. Goodwill by Book Value [Domain] Goodwill by Book Value [Domain] This element represents the disclosures required for the purpose of calculating net book value of goodwill. Goodwill Gross Value [Member] Goodwill Gross Value [Member] This element represents the gross book value of the goodwill. Goodwill Accumulated Impairment [Member] Goodwill Accumulated Impairment [Member] This element represents the accumulated loss recognized from the impairment of goodwill. Goodwill Net Value [Member] Goodwill Net Value [Member] This element represents the net book value of the goodwill. Goodwill Goodwill [Line Items] Goodwill, Gross Goodwill, Gross Goodwill, Impaired, Accumulated Impairment Loss Goodwill, Impaired, Accumulated Impairment Loss Impact of excess tax basis amortization Goodwill, Subsequent Recognition of Deferred Tax Asset Goodwill, Acquired During Period Goodwill, Acquired During Period Other, including changes in foreign exchange rates Goodwill, Other Changes Goodwill,Written off Related to Sale of Business Unit Goodwill, Written off Related to Sale of Business Unit Income Tax [Abstract] Income Tax [Abstract] Schedule of Income Tax Expense [Table] Schedule of Income Tax Expense [Table] A Schedule identifying the components of Income Tax Expense (Benefit) by Federal Foreign and State/Local as well as by Current and Deferred. Schedule of Income Tax Expense [Line Items] Schedule of Income Tax Expense [Line Items] [Line Items] for A Schedule identifying the components of Income Tax Expense (Benefit) by Federal Foreign and State/Local as well as by Current and Deferred. Current Federal Tax Expense (Benefit) Federal Income Tax Expense (Benefit), Continuing Operations Current Foreign Tax Expense (Benefit) Foreign Income Tax Expense (Benefit), Continuing Operations Current State and Local Tax Expense (Benefit) State and Local Income Tax Expense (Benefit), Continuing Operations Current Income Tax Expense (Benefit) Current Income Tax Expense (Benefit) Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Income (Loss) from Continuing Operations before Income Taxes, Domestic Income (Loss) from Continuing Operations before Income Taxes, Domestic Income (Loss) from Continuing Operations before Income Taxes, Foreign Income (Loss) from Continuing Operations before Income Taxes, Foreign Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule of Segment Reporting Information, by Segment [Table Text Block] Statement of Stockholders' Equity [Abstract] Equity Component ADDITIONAL PAID-IN CAPITAL Additional Paid-in Capital [Member] EMPLOYEE STOCK TRUST Employee Stock Trust [Member] Common stock issued to a trust (for example, a 'rabbi trust') set up specifically to accumulate stock for the sole purpose of distribution to participating employees. This trust does not allow employees to immediately or after a holding period diversify into nonemployer securities. The deferred compensation plan for which this trust is set up must be settled by the delivery of a fixed number of shares of employer stock. DEFERRED COMPENSATION EMPLOYEE STOCK TRUST Deferred Compensation Employee Stock Trust [Member] Common stock issued to a deferred compensation employee stock trust, which is set up specifically to accumulate stock for the sole purpose of distribution to participating employees. This trust does not allow employees to immediately or after a holding period diversify into nonemployer securities. The deferred compensation plan for which this trust is set up must be settled by the delivery of a fixed number of shares of employer stock. RETAINED EARNINGS Retained Earnings [Member] Retained Earnings, Appropriated [Member]