Goodwill and Intangible Assets Disclosure [Abstract] Change in the carrying amount of goodwill Schedule of Goodwill [Table Text Block] Intangible assets Schedule of Finite and Indefinite Lived Intangible Assets by Major Class [Table Text Block] Disclosure of the carrying value of intangibles assets (both amortizable and non-amortizable), in total and by major class. Finite-lived intangible assets have a stated useful life over which their gross carrying value is amortized. Indefinite-lived intangible assets are not subject to amortization. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. Restructuring and Related Activities [Abstract] Impairment and Restructuring Charges Restructuring and Related Activities Disclosure [Text Block] Debt Disclosure [Abstract] Financing Arrangements Debt Disclosure [Text Block] Accounting Policies [Abstract] New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Table] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Scenario, Previous Accounting Guidance [Member] Scenario, Previous Accounting Guidance [Member] Values that would have been reported if under a previous accounting guidance Scenario, Previously Reported [Member] Scenario, Previously Reported [Member] Scenario [Axis] Adjustments for Change in Accounting Principle [Axis] Change in Accounting Estimate by Type [Axis] Change in Accounting Estimate by Type [Axis] Change in Accounting Estimate, Type [Domain] Change in Accounting Estimate, Type [Domain] Contracts Accounted for under Percentage of Completion [Member] Contracts Accounted for under Percentage of Completion [Member] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Timken Gears and Services [Member] Timken Gears and Services [Member] A legal entity of The Timken Company Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] Accounting Standards Update 2014-09 [Member] Accounting Standards Update 2014-09 [Member] Accounting Standard Update 2018-02 [Member] Accounting Standard Update 2018-02 [Member] Accounting Standard Update 2018-02 Income Statement-Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. Accounting Standards Update 2014-09 [Member] Accounting Standards Update 2017-07 [Member] Accounting Standards Update 2017-07, Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Unbilled Receivables, Current Unbilled Receivables, Current Accounts Receivable, Net, Current Accounts Receivable, Net, Current Sales Revenue, Goods, Net Sales Revenue, Goods, Net Cost of Goods Sold Cost of Goods Sold Gross Profit Gross Profit Selling, General and Administrative Expense Selling, General and Administrative Expense Operating Income (Loss) Operating Income (Loss) Income (Loss) Before Income Taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets Liabilities and Equity Contract with Customer, Asset, Net Contract with Customer, Asset, Net Inventory, Net Inventory, Net Other Assets, Current Other Assets, Current Deferred Tax Assets, Net of Valuation Allowance, Noncurrent Deferred Tax Assets, Net of Valuation Allowance, Noncurrent Other Liabilities, Current Other Liabilities, Current Assets, Current Assets, Current Assets Assets Deferred income taxes Deferred Tax Liabilities, Net, Noncurrent Liabilities, Noncurrent Liabilities, Noncurrent Income Tax Effects Allocated Directly to Equity, Cumulative Effect of Change in Accounting Principle Income Tax Effects Allocated Directly to Equity, Cumulative Effect of Change in Accounting Principle Stockholders' Equity Attributable to Parent Stockholders' Equity Attributable to Parent Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Increase (Decrease) in Other Accrued Liabilities Increase (Decrease) in Other Accrued Liabilities Cumulative Effect on Retained Earnings, Tax Income Tax Expense (Benefit) Other Nonoperating Income (Expense) Other Nonoperating Income (Expense) Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net Income (Loss) Attributable to Parent Net Income (Loss) Attributable to Parent Basic earnings per share Earnings Per Share, Basic Diluted earnings per share Earnings Per Share, Diluted Deferred Income Tax Expense (Benefit) Deferred Income Tax Expense (Benefit) Increase (Decrease) in Accounts Receivable Increase (Decrease) in Accounts Receivable Increase (Decrease) in Unbilled Receivables Increase (Decrease) in Unbilled Receivables Increase (Decrease) in Inventories Increase (Decrease) in Inventories Increase (Decrease) in Other Operating Assets and Liabilities, Net Increase (Decrease) in Other Operating Assets and Liabilities, Net Net Cash Provided by Operating Activities Net Cash Provided by (Used in) Operating Activities Restricted cash Restricted Cash and Cash Equivalents, Current Retained Earnings (Accumulated Deficit) Retained Earnings (Accumulated Deficit) Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] Statement of Financial Position [Abstract] Allowances for accounts receivable Allowance for Doubtful Accounts Receivable, Current Preferred stock, no par value (Class I & Class II Preferred stock) Preferred Stock, No Par Value Preferred stock, shares authorized (Class I & Class II Preferred stock) Preferred Stock, Shares Authorized Preferred stock, shares issued (Class I & Class II Preferred stock) Preferred Stock, Shares Issued Common stock, no par value Common Stock, No Par Value Company common stock shares authorized Common Stock, Shares Authorized Common stock, shares issued Common Stock, Shares, Issued Treasury shares Treasury Stock, Shares Statement [Table] Statement [Table] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Statement [Line Items] Statement [Line Items] Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Segment Reporting [Abstract] Segment Information Segment Reporting Disclosure [Text Block] Property, Plant and Equipment [Abstract] Schedule of Long Lived Assets Held-for-sale [Table] Schedule of Long Lived Assets Held-for-sale [Table] Long Lived Assets Held-for-sale by Asset Type [Axis] Long Lived Assets Held-for-sale by Asset Type [Axis] Long Lived Assets Held-for-sale, Name [Domain] Long Lived Assets Held-for-sale, Name [Domain] Long Lived Assets Held-for-sale [Line Items] Long Lived Assets Held-for-sale [Line Items] Components of property, plant and equipment Property, Plant and Equipment [Table Text Block] Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Components of property, plant and equipment Property, Plant and Equipment, Net, by Type [Abstract] Property, Plant and Equipment: Property, Plant and Equipment, Net [Abstract] Land and buildings Property, Plant and Equipment, Other, Gross Machinery and equipment Machinery and Equipment, Gross Subtotal Property, Plant and Equipment, Gross Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Property, Plant and Equipment, net Property, Plant and Equipment, Net Disposal Group Name [Axis] Disposal Group Name [Axis] Disposal Groups, Including Discontinued Operations, Name [Domain] Disposal Group Name [Domain] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] Property Plant and Equipment (Textual) [Abstract] Property Plant and Equipment (Textual) [Abstract] Property plant and equipment. Depreciation expense Depreciation Equity [Abstract] Equity Stockholders' Equity Note Disclosure [Text Block] Earnings Per Share [Abstract] Earnings Per Share Earnings Per Share [Text Block] Inventory Disclosure [Abstract] Inventories, net: Inventory, Net, Items Net of Reserve Alternative [Abstract] Manufacturing supplies Other Inventory, Supplies, Gross Raw materials Inventory, Raw Materials, Gross Work in process Inventory, Work in Process, Gross Inventory, Finished Goods, Gross Inventory, Finished Goods, Gross Subtotal Inventory, Gross Allowance for obsolete and surplus inventory Inventory Valuation Reserves Total Inventories, net 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 Excluded from Computation of Earnings Per Share, by Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Earnings Per Share (Textual) [Abstract] Earnings Per Share (Textual) [Abstract] Earnings per share. Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount New Accounting Pronouncements and Changes in Accounting Principles [Abstract] Revenue Recognition, Policy [Policy Text Block] Description of New Adopted Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Retirement Benefits [Abstract] Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Retirement Plan Type [Axis] Retirement Plan Type [Axis] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Pension Plan [Member] Other Postretirement Benefits Plan [Member] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Pension and Other Postretirement Benefits Disclosure [Text Block] Pension and Other Postretirement Benefits Disclosure [Text Block] Reconciliation of the numerator and the denominator of basic earnings per share and diluted earnings per share Reconciliation of Numerator and Denominator of Basic Earnings Per Share and Diluted Earnings Per Share [Abstract] Reconciliation of numerator and denominator of basic earnings per share and diluted earnings per share. Numerator: Reconciliation of Numerator of Basic Earnings Per Share and Diluted Earnings Per Share [Abstract] Reconciliation of the numerator of basic earnings per share and diluted earnings per share. Income (Loss) from Continuing Operations Attributable to Parent Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Less Undistributed Earnings (Loss) Allocated to Nonvested Stock Less Undistributed Earnings (Loss) Allocated to Nonvested Stock Earnings allocated (not distributed) to participating securities under the two-class method to the extent that participating securities may share in earnings as if all the earnings for the period has been distributed. Income (Loss) from Continuing Operations, Per Basic and Diluted Share Income (Loss) from Continuing Operations, Per Basic and Diluted Share Denominator: Reconciliation of Denominator of Basic Earnings Per Share and Diluted Earnings Per Share [Abstract] Reconciliation of the denominator of basic earnings per share and diluted earnings per share. Weighted Average Number of Shares Outstanding, Basic Weighted Average Number of Shares Outstanding, Basic Effect of dilutive securities: Effect of Dilutive Securities [Abstract] Effect of dilutive securities. Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Weighted average number of shares outstanding, assuming dilution of stock options and awards Weighted Average Number of Shares Outstanding, Diluted Property, Plant and Equipment Property, Plant and Equipment Disclosure [Text Block] Revenue from Contract with Customer [Abstract] Disaggregation of Revenue [Table Text Block] Disaggregation of Revenue [Table Text Block] Contract with Customer, Asset and Liability [Table Text Block] Contract with Customer, Asset and Liability [Table Text Block] Schedule of Restructuring and Related Costs [Table] Schedule of Restructuring and Related Costs [Table] Segments [Axis] Segments [Axis] Segment [Domain] Segments [Domain] Mobile Industries [Member] Mobile Industries [Member] Mobile industries. Process Industries [Member] Process Industries [Member] Process industries. Corporate Segment [Member] Corporate Segment [Member] Restructuring and Related Cost [Line Items] Restructuring Cost and Reserve [Line Items] Tangible Asset Impairment Charges Tangible Asset Impairment Charges Impairment and Restructuring Charges for the Mobile Segment Severance Costs Severance Costs Business Exit Costs Business Exit Costs Total Restructuring, Settlement and Impairment Provisions Schedule of Goodwill [Table] Schedule of Goodwill [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Groeneveld [Member] Groeneveld [Member] 2017 Acquisition Acquired by The Timken Company Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Mobile Industries [Member] Goodwill [Line Items] Goodwill [Line Items] Goodwill and Other Intangible Assets (Textual) [Abstract] Goodwill and Other Intangible Assets (Textual) [Abstract] Not applicable. Amortization expense for intangible assets Amortization of Intangible Assets Future Amortization Expense Year 2015 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months Future Amortization Expense Year 2016 Finite-Lived Intangible Assets, Amortization Expense, Year Two Future Amortization Expense Year 2017 Finite-Lived Intangible Assets, Amortization Expense, Year Three Future Amortization Expense Year 2018 Finite-Lived Intangible Assets, Amortization Expense, Year Four Future Amortization Expense Year 2019 Finite-Lived Intangible Assets, Amortization Expense, Year Five Segment wise financial performance Schedule of Segment Reporting Information, by Segment [Table Text Block] Pension Plan [Member] Pension Plan [Member] Retirement Plan Sponsor Location [Axis] Retirement Plan Sponsor Location [Axis] Retirement Plan Sponsor Location [Domain] Retirement Plan Sponsor Location [Domain] Foreign Plan [Member] Foreign Plan [Member] Domestic Plan [Member] Domestic Plan [Member] Net periodic benefit cost for the Company retirement benefit plans Defined Benefit Plan [Abstract] Components of net periodic benefit cost: Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] Service cost Defined Benefit Plan, Service Cost Interest cost Defined Benefit Plan, Interest Cost Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Amortization of prior service cost Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Defined Benefit Plan, Actuarial Gain (Loss), Immediate Recognition as Component in Net Periodic Benefit (Cost) Credit Defined Benefit Plan, Actuarial Gain (Loss), Immediate Recognition as Component in Net Periodic Benefit (Cost) Credit Net periodic benefit cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Commitments and Contingencies Disclosure [Abstract] Schedule of Product Warranty Liability [Table Text Block] Schedule of Product Warranty Liability [Table Text Block] Concentration Risk [Table] Concentration Risk [Table] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Revenue from Contract with Customer [Member] Revenue from Contract with Customer [Member] Concentration Risk [Line Items] Concentration Risk [Line Items] Revenue Recognition, Policy [Policy Text Block] Pension and Other Postretirement Plans, Pensions, Policy [Policy Text Block] Pension and Other Postretirement Plans, Pensions, Policy [Policy Text Block] Trade and Other Accounts Receivable, Policy [Policy Text Block] Trade and Other Accounts Receivable, Policy [Policy Text Block] Fair Value Disclosures [Abstract] Assets and liabilities measured at fair value on a recurring basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Document and Entity Information [Abstract] Document and entity information. Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Postretirement Benefit Plans [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] Schedule of Defined Benefit Plans Disclosures [Table Text Block] Schedule of Defined Benefit Plans Disclosures [Table Text Block] Equity Schedule of Stockholders Equity [Table Text Block] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Asset Class [Axis] Asset Class [Axis] Asset Class [Domain] Asset Class [Domain] Fair Value by Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Recurring [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Segments [Domain] Altavista Bearing Plant [Member] [Member] Altavista Bearing Plant [Member] [Member] Bearing plant in Altavista, Virgina, expected to close in 2017 Benoni [Member] Benoni [Member] Benoni, South Africa where Company operations were closed Eligible Item or Group for Fair Value Option [Axis] Financial Instrument [Axis] Fair Value, Option, Eligible Item or Group [Domain] Financial Instruments [Domain] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Assets and Liabilities Measured at fair value on a recurring basis Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Short-term investments Investments, Fair Value Disclosure Foreign currency hedges Derivative Asset Total Assets Assets, Fair Value Disclosure, Recurring Foreign currency hedges Derivative Liability Total Liabilities Financial and Nonfinancial Liabilities, Fair Value Disclosure Retirement Plan Tax Status [Axis] Retirement Plan Tax Status [Axis] Retirement Plan Tax Status [Domain] Retirement Plan Tax Status [Domain] Retirement Plan Funding Status [Axis] Retirement Plan Funding Status [Axis] Retirement Plan Funding Status [Domain] Retirement Plan Funding Status [Domain] Retirement Plan Name [Axis] Retirement Plan Name [Axis] Retirement Plan Name [Domain] Retirement Plan Name [Domain] Defined Benefit Plan, Asset Categories [Axis] Defined Benefit Plan, Asset Categories [Axis] Plan Asset Categories [Domain] Plan Asset Categories [Domain] Industry Sector [Axis] Industry Sector [Axis] Industry Sector [Domain] Industry Sector [Domain] Equity Securities by Entity Size [Axis] Equity Securities by Entity Size [Axis] Equity Securities, Entity Size [Domain] Equity Securities, Entity Size [Domain] Equity Securities by Investment Objective [Axis] Equity Securities by Investment Objective [Axis] Equity Securities, Investment Objective [Domain] Equity Securities, Investment Objective [Domain] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Related Party Transaction [Axis] Related Party Transaction [Axis] Related Party Transaction [Domain] Related Party Transaction [Domain] Components of inventories Schedule of Inventory, Current [Table Text Block] Line of Credit Facility [Table] Line of Credit Facility [Table] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Euro Term Loan - Variable Rate [Member] Euro Term Loan - Variable Rate [Member] Euro Term Loan - Variable Rate Euro Senior Unsecured Notes - 2.02% [Member] Euro Senior Unsecured Notes - 2.02% [Member] Euro Senior Unsecured Notes - 2.02% [Member] Senior Unsecured Notes - Variable Rate [Member] Senior Unsecured Notes - Variable Rate [Member] Senior Unsecured Notes - Variable Rate [Member] Foreign Subsidiary [Member] Foreign Subsidiary [Member] Foreign subsidiary. Line of Credit Accounts Receivable Securitization [Member] Line of Credit Accounts Receivable Securitization [Member] Line of credit accounts receivable securitization. Currency [Axis] Currency [Axis] All Currencies [Domain] All Currencies [Domain] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Long-term Debt Interest Rate [Axis] Long-term Debt Interest Rate [Axis] Long term debt interest rate. Long Term Debt Interest Rate [Domain] Long Term Debt Interest Rate [Domain] Long term debt interest rate. Series A Medium Term Note [Member] Series A Medium Term Note [Member] Series A medium term note. Senior Unsecured Notes - 3.875% [Member] Senior Unsecured Notes - 3.875% [Member] Senior Unsecured Notes - 3.875% [Member] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Line of Credit Facility, Interest Rate at Period End Line of Credit Facility, Interest Rate at Period End Short-term Debt Short-term Debt Long-term Fixed-rate Debt, Carrying Value Long-term Fixed-rate Debt, Carrying Value Represents the carrying value of the company's long-term, fixed-rate debt as of the reporting period date. Financing Arrangements (Textual) [Abstract] Financing Arrangements (Textual) [Abstract] Financing arrangements. Maximum borrowing capacity under line of credit Line of Credit Facility, Maximum Borrowing Capacity Borrowings guarantees Guarantor Obligations, Maximum Exposure, Undiscounted Remaining Borrowing Capacity under Line of Credit Facility of Company's foreign subsidiaries Line of Credit Facility, Remaining Borrowing Capacity Debt Instrument, Issuance Date Debt Instrument, Issuance Date Proceeds from Issuance of Long-term Debt Proceeds from Issuance of Long-term Debt Line of credit expiration date Line of Credit Facility, Expiration Date Line of Credit Facility, Fair Value of Amount Outstanding Long-term Debt Line of Credit stated variable interest rate, High Range Line of Credit Stated Variable Interest Rate, High Range High end of interest rates at the period end comprising the entity's portfolio of variable-rate lines of credit for certain foreign subsidiaries. Debt Instrument, Interest rate Debt Instrument, Interest Rate, Stated Percentage Debt Instrument, Maturity Date Debt Instrument, Maturity Date Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate Business Acquisition, Effective Date of Acquisition Business Acquisition, Effective Date of Acquisition Accrual for Environmental Loss Contingencies Accrual for Environmental Loss Contingencies Product Warranty Expense Product Warranty Expense Standard and Extended Product Warranty Accrual, Decrease for Payments Standard and Extended Product Warranty Accrual, Decrease for Payments Standard Product Warranty Accrual Standard Product Warranty Accrual Statement of Cash Flows [Abstract] Proceeds from Sale and Maturity of Marketable Securities Proceeds from Sale and Maturity of Marketable Securities Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents CASH PROVIDED (USED) Cash and Cash Equivalents, Period Increase (Decrease) [Abstract] Operating Activities Net Cash Provided by (Used in) Operating Activities [Abstract] Net (loss) income attributable to noncontrolling interest Net Income (Loss) Attributable to Noncontrolling Interest Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Loss on sale of assets Gain (Loss) on Disposition of Property Plant Equipment Deferred income tax provision Stock-based compensation expense Share-based Compensation Pension and other postretirement expense Pension and Other Postretirement Benefits Cost (Reversal of Cost) Pension contributions and other postretirement benefit payments Payment for Pension and Other Postretirement Benefits Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable Inventories Accounts payable, trade Increase (Decrease) in Accounts Payable, Trade Other accrued expenses Income taxes Increase (Decrease) in Income Taxes Other, net Investing Activities Net Cash Provided by (Used in) Investing Activities [Abstract] Capital expenditures Payments to Acquire Productive Assets Acquisitions, net of cash received Payments to Acquire Businesses, Net of Cash Acquired Proceeds from disposals of property, plant and equipment Proceeds from Sale of Property, Plant, and Equipment Common Stock, Value, Outstanding Payments to Acquire Marketable Securities Other Payments for (Proceeds from) Other Investing Activities Net Cash Used by Investing Activities Net Cash Provided by (Used in) Investing Activities Financing Activities Net Cash Provided by (Used in) Financing Activities [Abstract] Cash dividends paid to shareholders Payments of Ordinary Dividends, Common Stock Purchase of treasury shares Payments for Repurchase of Common Stock Net proceeds from common share activity Proceeds from Issuance of Common Stock Payments Related to Tax Withholding for Share-based Compensation Payments Related to Tax Withholding for Share-based Compensation Proceeds from Accounts Receivable Securitization Proceeds from Accounts Receivable Securitization Repayments of Accounts Receivable Securitization Repayments of Accounts Receivable Securitization Payments on long-term debt Repayments of Long-term Debt Short-term debt activity, net Proceeds from (Repayments of) Short-term Debt Proceeds from (Payments for) Other Financing Activities Proceeds from (Payments for) Other Financing Activities Net Cash Used by Financing Activities Net Cash Provided by (Used in) Financing Activities Effect of exchange rate changes on cash Effect of Exchange Rate on Cash and Cash Equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Cash and cash equivalents beginning of period Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents end of period Statement, Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Stated Capital [Member] Additional Paid-in Capital [Member] Other Paid-In Capital [Member] Other Additional Capital [Member] Earnings Invested in the Business [Member] Retained Earnings, Unappropriated [Member] Accumulated Other Comprehensive (Loss) [Member] AOCI Attributable to Parent [Member] Treasury Stock [Member] Treasury Stock [Member] Noncontrolling Interest [Member] Noncontrolling Interest [Member] Common Stock, Value, Outstanding Common Stock, Value, Outstanding 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 Treasury Stock, Value Treasury Stock, Value Stockholders' Equity Attributable to Noncontrolling Interest Stockholders' Equity Attributable to Noncontrolling Interest Cumulative Effect of New Accounting Principle in Period of Adoption Cumulative Effect of New Accounting Principle in Period of Adoption Adjustments to Additional Paid in Capital [Abstract] Adjustments to Additional Paid in Capital [Abstract] Shareholding pattern Shareholding Pattern [Abstract] Shareholding pattern. Beginning Balance Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Pension and postretirement liability adjustment (net of the income tax benefit of $1.5 million) Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Dividends - $0.26 per share Dividends, Common Stock, Cash Stock-based compensation expense Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Payments for Repurchase of Common Stock Stock option exercise activity Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures Restricted shares surrendered (issued) Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Ending Balance Additional Paid in Capital, Common Stock Additional Paid in Capital, Common Stock Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated Other Comprehensive Income (Loss), Net of Tax Pulaski [Member] Pulaski [Member] A timken bearing plant located in Pulaski, Tennessee Restructuring Cost and Reserve [Axis] Restructuring Type [Axis] Type of Restructuring [Domain] Type of Restructuring [Domain] WorkforceReduction [Member] WorkforceReduction [Member] Reduction in workforce Exit costs Restructuring and Related Cost, Number of Positions Eliminated Restructuring and Related Cost, Expected Number of Positions Eliminated Severance Costs Restructuring, Settlement and Impairment Provisions Restructuring accrual Restructuring Reserve Process Industries [Member] Goodwill, Other Increase (Decrease) Goodwill, Other Increase (Decrease) Goodwill, Foreign Currency Translation Gain (Loss) Goodwill, Foreign Currency Translation Gain (Loss) Change in the carrying amount of Goodwill Goodwill [Roll Forward] Goodwill, Beginning Balance Goodwill Goodwill, Ending Balance Restructuring Cost and Reserve [Line Items] Schedule of Restructuring and Related Costs Restructuring and Related Costs [Table Text Block] Roll Forward consolidated restructuring accrual Schedule of Restructuring Reserve by Type of Cost [Table Text Block] Income Tax Disclosure [Abstract] Excluding discrete items [Table] Excluding discrete items [Table] Excluding discrete items from effective tax rate[Table] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] The Tax Cut and Jobs Act of 2018 [Member] The Tax Cut and Jobs Act of 2018 [Member] The Tax Cut and Jobs Act of 2018 excluding discrete items [Axis] excluding discrete items [Axis] excluding discrete items on the effective tax rate [Axis] excluding discrete items [Domain] excluding discrete items [Domain] [Domain] for excluding discrete items on the effective tax rate [Axis] Excluding discrete items [Line Items] Excluding discrete items [Line Items] [Line Items] for Excluding discrete items from effective tax rate[Table] Provision (benefit) for income taxes Effective Income Tax Rate Reconciliation, Percent Effective Income Tax Rate Reconciliation, Percent 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, Change in Enacted Tax Rate, Percent Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent Tax on Unremitted Foreign Earnings Tax on Unremitted Foreign Earnings Tax on Unremitted Foreign Earnings related The Tax Cut and Jobs Act of 2018 Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Other Long Term Debt [Member] Other Long Term Debt [Member] Other long term debt. Line of Credit Facility [Axis] Lender Name [Axis] Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] Debt Instrument [Line Items] Debt Instrument [Line Items] Line of Credit Stated Variable Interest Rate Low Range Line of Credit Stated Variable Interest Rate Low Range Low end of interest rates at the period end comprising the entity's portfolio of variable-rate lines of credit for certain foreign subsidiaries. Debt Instrument, Interest Rate, Stated Percentage Line of Credit Facility, Remaining Borrowing Capacity Long-term debt Long-term Debt, Current and Noncurrent [Abstract] Total Long-term debt Less current maturities Long-term Debt, Current Maturities Long-term debt Long-term Debt, Excluding Current Maturities Line of Credit Stated Variable Interest Rate, High Range Reconciliation of the numerator and the denominator of basic earnings per share and diluted earnings per share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Income Taxes [Abstract] Income Taxes [Abstract] Income Tax Disclosure [Text Block] Income Tax Disclosure [Text Block] Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] ASSETS Assets [Abstract] Current Assets Assets, Current [Abstract] Cash and cash equivalents Accounts receivable, less allowances (2018 – $21.1 million; 2017 – $20.3 million) Inventories, net Deferred charges and prepaid expenses Prepaid Expense and Other Assets, Current Other current assets Total Current Assets Property, Plant and Equipment, net Other Assets Other Assets [Abstract] Goodwill Non-current pension assets Assets for Plan Benefits, Defined Benefit Plan Other intangible assets Intangible Assets, Net (Excluding Goodwill) Deferred income taxes Other Assets, Noncurrent Other Assets, Noncurrent Total Other Assets Assets, Noncurrent Total Assets LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Current Liabilities Liabilities, Current [Abstract] Short-term debt Current portion of long-term debt Accounts payable, trade Accounts Payable, Current Salaries, wages and benefits Employee-related Liabilities, Current Income taxes payable Accrued Income Taxes, Current Other current liabilities Total Current Liabilities Liabilities, Current Non-Current Liabilities Liabilities, Noncurrent [Abstract] Accrued pension cost Liability, Defined Benefit Pension Plan, Noncurrent Accrued postretirement benefits cost Liability, Other Postretirement Defined Benefit Plan, Noncurrent Other non-current liabilities Other Liabilities, Noncurrent Total Non-Current Liabilities Shareholders' Equity Stockholders' Equity Attributable to Parent [Abstract] Class I and II Serial Preferred Stock, without par value: Authorized – 10,000,000 shares each class, none issued Preferred Stock, Value, Issued Other paid-in capital Earnings invested in the business Accumulated other comprehensive loss Treasury shares at cost (2018 - 19,152,333 shares; 2017 - 20,672,133 shares) Total Shareholders' Equity Noncontrolling Interest Total Equity Total Liabilities and Shareholders' Equity Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies Disclosure [Text Block] Fair Value Fair Value Disclosures [Text Block] Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Class of Stock [Line Items] Class of Stock [Line Items] Income Tax Effects Allocated Directly to Equity, Cumulative Effect of Change in Accounting Principle Income Tax Expense (Benefit), Intraperiod Tax Allocation Equity (Textual) [Abstract] Equity (Textual) [Abstract] Equity. Dividend per share Common Stock, Dividends, Per Share, Declared Schedule of Finite-Lived Intangible Assets by Major Class [Table] Schedule of Finite-Lived Intangible Assets [Table] Acquired Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Customer Relationships [Member] Customer Relationships [Member] Technology-Based Intangible Assets [Member] Technology-Based Intangible Assets [Member] Trademarks [Member] Trademarks [Member] Computer Software, Intangible Asset [Member] Computer Software, Intangible Asset [Member] Unclassified Indefinite-lived Intangible Assets [Member] Unclassified Indefinite-lived Intangible Assets [Member] Trade name [Member] Trade Names [Member] Air Transportation Equipment [Member] FAA air agency certificates [Member] FAA air agency certificates [Member] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Intangible assets subject to amortization: Finite-Lived Intangible Assets, Net [Abstract] Intangible assets, Gross Carrying Amount Finite-Lived Intangible Assets, Gross Intangible assets, Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Intangible assets, Net Carrying Amount Finite-Lived Intangible Assets, Net Intangible assets not subject to amortization: Intangible Assets not Subject to Amortization [Abstract] Not applicable. Trade name Indefinite-Lived Trade Names FAA air agency certificates Indefinite Lived FAA Air Agency Certificates Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the capitalized costs to acquire Federal Aviation Administration (FAA) air agency certificates allowing the company to operate as a repair station for limited accessories, limited airframes and limited power plants. These certificates have an indefinite period of benefit. Indefinite Lived Intangible Assets Net Indefinite-Lived Intangible Assets (Excluding Goodwill) Total intangible assets, Gross Carrying Amount Intangible Assets, Gross (Excluding Goodwill) Total intangible assets, Net Carrying Amount Accumulated Other Comprehensive Income Components Reclassification [Table] Accumulated Other Comprehensive Income Components Reclassification [Table] Accumulated Other Comprehensive Income Components Reclassification [Table] Components in other comprehensive income [Axis] Components in other comprehensive income [Axis] Information by component in other comprehensive income. Components in other comprehensive income [Domain] Components in other comprehensive income [Domain] [Domain] for Information by component in other comprehensive income. Foreign currency translation adjustment [Member] Foreign currency translation adjustment [Member] Foreign currency translation adjustment AOCI component [Member] Pension and postretirement liability adjustment [Member] Pension and postretirement liability adjustment [Member] Pension and postretirement liability adjustment AOCI Component Derivative financial instruments fair value adjustment [Member] Derivative financial instruments fair value adjustment [Member] Derivative financial instruments fair value adjustment AOCI component [Member] Accumulated Other Comprehensive Income Components Reclassification [Line Items] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Other Comprehensive Income (Loss), before Reclassifications, before Tax Other Comprehensive Income (Loss), before Reclassifications, before Tax Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax Accumulated Other Comprehensive Income [Roll Forward] Accumulated Other Comprehensive Income [Roll Forward] Accumulated Other Comprehensive Income [Roll Forward] Beginning Balance Income tax (benefit) expense Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Net current period other comprehensive (loss) income, net of income taxes Other Comprehensive Income (Loss), Net of Tax Other Comprehensive (Income) Loss, Net of Tax, Portion Attributable to Noncontrolling Interest Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest Accumulated Other Comprehensive Income (Loss) Attributable to Spinoff Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Ending Balance Revenue from Contract with Customer [Text Block] Revenue from Contract with Customer [Text Block] Fair Value Measurements, Recurring and Nonrecurring [Table] Measurement Frequency [Axis] Fair Value, Measurements, Recurring [Member] Assets, Fair Value Disclosure, Recurring Long-term Debt, Fair Value Long-term Debt, Fair Value Organization, Consolidation and Presentation of Financial Statements [Abstract] Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Goodwill and Other Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Statement of Comprehensive Income [Abstract] Other comprehensive income, net of tax: Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Foreign currency translation adjustments Other comprehensive income Comprehensive Income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Less: comprehensive (loss) income attributable to noncontrolling interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive Income attributable to The Timken Company Comprehensive Income (Loss), Net of Tax, Attributable to Parent Roll Forward consolidated restructuring accrual Restructuring Reserve [Roll Forward] Beginning Balance Expense Restructuring Charges Payments Payments for Restructuring Ending Balance Inventories Inventory Disclosure [Text Block] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Segment wise financial performance Segment Wise Financial Performance [Abstract] Segment wise financial performance. Net sales to external customers: Net Sales to External Customers [Abstract] Net sales to external customers. Net sales Segment EBIT: Segment EBIT [Abstract] Segment EBIT. Total EBIT for reportable segments Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Unallocated corporate expenses Segment Reporting Unallocated Corporate Expenses Total corporate expenses that are not attributable to one of the entity's reportable segments. Interest expense Interest Expense Investment Income, Interest Investment Income, Interest accumulated other comprehensive income components reclassification Accumulated Other Comprehensive Income Components Reclassification [Text Block] The entire disclosure for significant items reclassified out of accumulated other comprehensive income to net income in their entirety during the reporting period. Short-term debt Schedule of Short-term Debt [Table Text Block] Long-term debt Schedule of Long-term Debt Instruments [Table Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Text Block] Derivative Instruments and Hedging Activities Disclosure [Text Block] Income Statement [Abstract] Cost of products sold Gross Profit Selling, general and administrative expenses Impairment and restructuring charges Operating Income (Loss) Other (expense) income, net Income (Loss) Before Income Taxes Net Income Net Income (loss) attributable to The Timken Company Net Income per Common Share attributable to The Timken Company Common Shareholders Common Stock, Dividends, Per Share, Declared Percentage of LIFO Inventory Percentage of LIFO Inventory Percentage of FIFO Inventory Percentage of FIFO Inventory Inventory Reserve (LIFO) Inventory, LIFO Reserve Schedule of Short-term Debt [Table] Schedule of Short-term Debt [Table] Maximum [Member] Maximum [Member] Minimum [Member] Minimum [Member] Short-term Debt [Line Items] Short-term Debt [Line Items] Short-term debt Short Term Debt [Abstract] Short term debt. Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location [Table Text Block] Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Derivative Instruments, Gain (Loss) [Table Text Block] Derivative Instruments, Gain (Loss) [Table Text Block] Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Products and Services [Axis] Products and Services [Axis] Products and Services [Domain] Products and Services [Domain] Service Revenue [Member] Service Revenue [Member] Service Revenue recognized Billing Status, Type [Axis] Billing Status, Type [Axis] Receivables Billing Status [Domain] Receivables Billing Status [Domain] Unbilled Revenues [Member] Unbilled Revenues [Member] Billed Revenues [Member] Billed Revenues [Member] Initial Application Period Cumulative Effect Transition [Axis] Initial Application Period Cumulative Effect Transition [Axis] Initial Application Period Cumulative Effect Transition [Domain] Initial Application Period Cumulative Effect Transition [Domain] UNITED STATES UNITED STATES Canada Mexico and South America [Member] Canada Mexico and South America [Member] Canada Mexico and South America [Member] EMEA [Member] EMEA [Member] Asia Pacific [Member] Asia Pacific [Member] Contract with Customer, Basis of Pricing [Axis] Contract with Customer, Basis of Pricing [Axis] Contract with Customer, Basis of Pricing [Domain] Contract with Customer, Basis of Pricing [Domain] Contract with Customer, Duration [Axis] Contract with Customer, Duration [Axis] Contract with Customer, Duration [Domain] Contract with Customer, Duration [Domain] Timing of Transfer of Good or Service [Axis] Timing of Transfer of Good or Service [Axis] Timing of Transfer of Good or Service [Domain] Timing of Transfer of Good or Service [Domain] Transferred over Time [Member] Transferred over Time [Member] Contract with Customer, Sales Channel [Axis] Contract with Customer, Sales Channel [Axis] Contract with Customer, Sales Channel [Domain] Contract with Customer, Sales Channel [Domain] Sales Channel, Directly to Consumer [Member] Sales Channel, Directly to Consumer [Member] Sales Channel, Through Intermediary [Member] Sales Channel, Through Intermediary [Member] Customer [Axis] Customer [Axis] Customer [Domain] Customer [Domain] U.S. Government [Member] U.S. Government [Member] U.S. Government Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Unbilled Receivables, Current Revenues Revenues Revenue, Remaining Performance Obligation Revenue, Remaining Performance Obligation Foreign Currency Cash Flow Hedge Asset at Fair Value Foreign Currency Cash Flow Hedge Asset at Fair Value Derivative, Notional Amount Derivative, Notional Amount Foreign Currency Cash Flow Hedge Liability at Fair Value Foreign Currency Cash Flow Hedge Liability at Fair Value Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value Derivative Asset Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value Derivative Liability Unrealized Gain on Foreign Currency Derivatives, before Tax Unrealized Gain on Foreign Currency Derivatives, before Tax Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments Defined Benefit Plan, Interest Cost Defined Benefit Plan, Expected Return (Loss) on Plan Assets Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Net periodic benefit cost for the Company's retirement benefit plans