Entity Central Index Key Operating and finance Lease liabilities payments remainder of fiscal year. Operating and finance lease liabilities payments due year two. Operating and finance lease liabilities payments due year three. Operating and finance lease liabilities payments due year four. Operating and finance lease liabilities payments due year five. Operating and finance lease liabilities payments due after year five. Operating and finance lease liabilities undiscounted excess amount. Operating and finance lease liabilities. Foreign debt short term amount. Document and entity information. Document And Entity Information [Abstract] 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 Trading Symbol Trading Symbol Entity Registrant Name Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding Statement Of Income And Comprehensive Income [Abstract] Net sales Revenue From Contract With Customer Excluding Assessed Tax Cost of materials sold Cost Of Goods And Services Sold Gross profit Gross Profit Warehousing, delivery, selling, general, and administrative Selling General And Administrative Expense Restructuring and other charges Restructuring Charges Operating profit Operating Income Loss Other income and (expense), net Nonoperating Income Expense Interest and other expense on debt Interest And Debt Expense Income before income taxes Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest Provision for income taxes Income Tax Expense Benefit Net income Profit Loss Less: Net income attributable to noncontrolling interest Net Income Loss Attributable To Noncontrolling Interest Net income attributable to Ryerson Holding Corporation Net Income Loss Comprehensive income Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest Less: Comprehensive income attributable to noncontrolling interest Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest Comprehensive income attributable to Ryerson Holding Corporation Comprehensive Income Net Of Tax Basic earnings per share Earnings Per Share Basic Diluted earnings per share Earnings Per Share Diluted Asset additions under adoption of accounting principal noncash investing activities. Asset additions under financing arrangements noncash investing activities. Noncash investing activities abstract. Noncash financing activities abstract. Statement Of Cash Flows [Abstract] Operating activities: Net Cash Provided By Used In Operating Activities [Abstract] Net income Adjustments to reconcile net income to net cash provided by (used in) operating activities: Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Depreciation and amortization Depreciation And Amortization Stock-based compensation Share Based Compensation Deferred income taxes Deferred Income Tax Expense Benefit Provision for allowances, claims, and doubtful accounts Provision For Doubtful Accounts Loss on retirement of debt Gains Losses On Extinguishment Of Debt Non-cash (gain) loss from derivatives Derivative Gain Loss On Derivative Net Other items Other Noncash Income Expense Change in operating assets and liabilities: Increase Decrease In Operating Capital [Abstract] Receivables Increase Decrease In Receivables Inventories Increase Decrease In Inventories Other assets Increase Decrease In Other Operating Assets Accounts payable Increase Decrease In Accounts Payable Accrued liabilities Increase Decrease In Accrued Liabilities Accrued taxes payable/receivable Increase Decrease In Accrued Taxes Payable Deferred employee benefit costs Increase Decrease In Pension And Postretirement Obligations Net adjustments Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities Net cash provided by (used in) operating activities Net Cash Provided By Used In Operating Activities Investing activities: Net Cash Provided By Used In Investing Activities [Abstract] Capital expenditures Payments To Acquire Property Plant And Equipment Proceeds from sale of property, plant, and equipment Proceeds From Sale Of Property Plant And Equipment Net cash used in investing activities Net Cash Provided By Used In Investing Activities Financing activities: Net Cash Provided By Used In Financing Activities [Abstract] Repayment of debt Repayments Of Long Term Debt Net proceeds (repayments) of short-term borrowings Proceeds From Repayments Of Short Term Debt Maturing In Three Months Or Less Net increase (decrease) in book overdrafts Increase Decrease In Book Overdrafts Principal payments on finance lease obligations Finance Lease Principal Payments Contingent payment related to acquisitions Payment For Contingent Consideration Liability Financing Activities Net cash provided by (used in) financing activities Net Cash Provided By Used In Financing Activities Net decrease in cash, cash equivalents, and restricted cash Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect Effect of exchange rate changes on cash, cash equivalents, and restricted cash Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations Net change in cash, cash equivalents, and restricted cash Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect Cash, cash equivalents, and restricted cash—beginning of period Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations Cash, cash equivalents, and restricted cash—end of period Supplemental disclosures: Supplemental Cash Flow Information [Abstract] Cash paid during the period for: Supplemental Cash Flow Elements [Abstract] Interest paid to third parties, net Interest Paid Net Income taxes, net Income Taxes Paid Net Noncash investing activities: Noncash Investing Activities [Abstract] Asset additions under adoption of accounting principal ASC 842 Asset Additions Under Adoption Of Accounting Principal Noncash Investing Activities Asset additions under operating leases Right Of Use Asset Obtained In Exchange For Operating Lease Liability Asset additions under finance leases and sale-leasebacks Right Of Use Asset Obtained In Exchange For Finance Lease Liability Asset additions under financing arrangements Asset Additions Under Financing Arrangements Noncash Investing Activities Noncash financing activities: Noncash Financing Activities [Abstract] Short term debt converted to capital lease Debt Conversion Original Debt Amount1 Condensed Financial Information Of Parent Company Only Disclosure [Abstract] Assets Assets [Abstract] Current assets: Assets Current [Abstract] Cash and cash equivalents Cash And Cash Equivalents At Carrying Value Restricted cash Restricted Cash Current Receivables less provisions Receivables Net Current Inventories Inventory Net Prepaid expenses and other current assets Prepaid Expense And Other Assets Current Total current assets Assets Current Property, plant, and equipment, at cost Property Plant And Equipment Gross Less: Accumulated depreciation Accumulated Depreciation Depletion And Amortization Property Plant And Equipment Property, plant, and equipment, net Property Plant And Equipment Net Operating lease assets Operating Lease Right Of Use Asset Other intangible assets Finite Lived Intangible Assets Net Goodwill Goodwill Deferred charges and other assets Prepaid Expense And Other Assets Noncurrent Total assets Assets Liabilities Liabilities [Abstract] Current liabilities: Liabilities Current [Abstract] Accounts payable Accounts Payable Current Salaries, wages, and commissions Employee Related Liabilities Current Other accrued liabilities Other Accrued Liabilities Current Short-term debt Long Term Debt Current Current portion of operating lease liabilities Operating Lease Liability Current Current portion of deferred employee benefits Pension And Other Postretirement Defined Benefit Plans Current Liabilities Total current liabilities Liabilities Current Long-term debt Long Term Debt Noncurrent Deferred employee benefits Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent Noncurrent operating lease liabilities Operating Lease Liability Noncurrent Other noncurrent liabilities Other Liabilities Noncurrent Total liabilities Liabilities Commitments and contingencies Commitments And Contingencies Equity Stockholders Equity Including Portion Attributable To Noncontrolling Interest [Abstract] Ryerson Holding Corporation stockholders’ equity: Stockholders Equity [Abstract] Preferred stock, value Preferred Stock Value Common stock, value Common Stock Value Capital in excess of par value Additional Paid In Capital Common Stock Retained earnings Retained Earnings Accumulated Deficit Treasury stock at cost - Common stock, value Treasury Stock Value Accumulated other comprehensive loss Accumulated Other Comprehensive Income Loss Net Of Tax Total Ryerson Holding Corporation stockholders’ equity Stockholders Equity Noncontrolling interest Minority Interest Total equity Stockholders Equity Including Portion Attributable To Noncontrolling Interest Total liabilities and equity Liabilities And Stockholders Equity Statement Of Financial Position [Abstract] Receivables, provisions Allowance For Doubtful Accounts Receivable Current Preferred stock, par value Preferred Stock Par Or Stated Value Per Share Preferred stock, shares authorized Preferred Stock Shares Authorized Preferred stock, shares issued Preferred Stock Shares Issued Common stock, par value Common Stock Par Or Stated Value Per Share Common stock, shares authorized Common Stock Shares Authorized Common stock, shares issued Common Stock Shares Issued Treasury stock at cost - Common stock, shares Treasury Stock Shares Accounting Policies [Abstract] Financial Statements Organization Consolidation And Presentation Of Financial Statements Disclosure [Text Block] New Accounting Pronouncements And Changes In Accounting Principles [Abstract] Recent Accounting Pronouncements New Accounting Pronouncements And Changes In Accounting Principles [Text Block] Cash And Cash Equivalents [Abstract] Cash, Cash Equivalents, and Restricted Cash Cash And Cash Equivalents Disclosure [Text Block] Inventory Disclosure [Abstract] Inventories Inventory Disclosure [Text Block] Lessee, operating and financing leases. Leases [Abstract] Leases Lessee Operating And Financing Leases [Text Block] Goodwill And Intangible Assets Disclosure [Abstract] Goodwill and Other Intangible Assets Goodwill And Intangible Assets Disclosure [Text Block] Business Combinations [Abstract] Acquisitions Business Combination Disclosure [Text Block] Debt Disclosure [Abstract] Long-Term Debt Debt Disclosure [Text Block] Compensation And Retirement Disclosure [Abstract] Employee Benefits Pension And Other Postretirement Benefits Disclosure [Text Block] Commitments And Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments And Contingencies Disclosure [Text Block] Investments All Other Investments [Abstract] Derivatives and Fair Value Measurements Financial Instruments Disclosure [Text Block] Equity [Abstract] Stockholders' Equity (Deficit), Accumulated Other Comprehensive Income (Loss) and Noncontrolling Interest Stockholders Equity Note Disclosure [Text Block] Revenue Recognition [Abstract] Revenue Recognition Revenue From Contract With Customer [Text Block] Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] Earnings Per Share [Abstract] Earnings Per Share Earnings Per Share [Text Block] Recent Accounting Pronouncements New Accounting Pronouncements Policy Policy [Text Block] Reconciliation of Cash, Cash Equivalents, and Restricted Cash Schedule Of Restricted Cash And Cash Equivalents [Text Block] Schedule of Inventories Schedule Of Inventory Current Table [Text Block] Summary of location and amount of lease assets and lease liabilities reported in condensed consolidated balance sheets. Summary of Location and Amount of Lease Assets and Lease Liabilities Summary Of Location And Amount Of Lease Assets And Lease Liabilities Reported In Condensed Consolidated Balance Sheets Table [Text Block] Summary of Location and Amount of Lease Expense Lease Cost Table [Text Block] Schedule of maturity analysis of operating and finance lease liabilities. Schedule of Maturity Analysis of Lease Liabilities Schedule Of Maturity Analysis Of Operating And Finance Lease Liabilities Table [Text Block] Summary of weighted-average remaining lease term and discount rate for operating and finance leases. Schedule of Weighted-Average Remaining Lease Term and Discount Rate for Operating and Finance Leases Summary Of Weighted Average Remaining Lease Term And Discount Rate For Operating And Finance Leases Table [Text Block] Summary of other information reported in condensed consolidated statements of cash flows. Schedule of Other Information Reported in Condensed Consolidated Statement of Cash Flows Summary Of Other Information Reported In Condensed Consolidated Statements Of Cash Flows Table [Text Block] Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed Schedule Of Recognized Identified Assets Acquired And Liabilities Assumed Table [Text Block] Summary of Unaudited Pro forma Information Presents Consolidated Results of Operation Business Acquisition Pro Forma Information [Text Block] Long-Term Debt Schedule Of Debt Table [Text Block] Components of Net Periodic Benefit (Credit) Cost Schedule Of Net Benefit Costs Table [Text Block] Location and Fair Value Amount of Derivative Instruments Schedule Of Derivative Instruments In Statement Of Financial Position Fair Value [Text Block] Schedule of derivative instrument volume of activity. Volume of Company 's Activity in Derivative Instruments Schedule Of Derivative Instruments Volume Of Activity Table [Text Block] Location and Amount of Gains and Losses on Derivatives Not Designated as Hedging Instruments Reported in Condensed Consolidated Statements of Comprehensive Income Schedule Of Other Derivatives Not Designated As Hedging Instruments Statements Of Financial Performance And Financial Position Location Table [Text Block] Location and Amount of Gains and Losses on Derivatives Designated as Hedging Instruments Reported in Condensed Consolidated Statements of Comprehensive Income Schedule Of Cash Flow Hedging Instruments Statements Of Financial Performance And Financial Position Location Table [Text Block] Assets and Liabilities Measured and Recorded at Fair Value Schedule Of Fair Value Assets And Liabilities Measured On Recurring Basis Table [Text Block] Carrying and Estimated Fair Values of Financial Instruments Fair Value By Balance Sheet Grouping [Text Block] Change in Stockholders' Equity (Deficit), Accumulated Other Comprehensive Income (Loss) and Noncontrolling Interest Schedule Of Stockholders Equity Table [Text Block] Changes in Accumulated Other Comprehensive Income/(Loss) Net of Tax by Component Schedule Of Accumulated Other Comprehensive Income Loss Table [Text Block] Reclassifications Out of Accumulated Other Comprehensive Income (Loss) Reclassification Out Of Accumulated Other Comprehensive Income Table [Text Block] Summary of Disaggregated Revenue Disaggregation Of Revenue Table [Text Block] Summary of Significant Changes in Contract Assets and Contract Liabilities Balances Contract With Customer Asset And Liability Table [Text Block] Calculation of Basic and Diluted Earnings Per Share Schedule Of Earnings Per Share Basic And Diluted Table [Text Block] Parent company shares owned by affiliates. Parent company percentage owned by affiliates. Parent company shares owned by affiliates Parent Company Shares Owned By Affiliates Parent company percentage owned by affiliates Parent Company Percentage Owned By Affiliates Schedule Of Change In Accounting Estimate [Table] Schedule Of Change In Accounting Estimate [Table] Adjustments for New Accounting Pronouncements Adjustments For New Accounting Pronouncements [Axis] Type of Adoption Type Of Adoption [Member] ASU 2016-02 [Member] Accounting Standards Update201602 [Member] Recent Accounting Pronouncements [Line Items] Change In Accounting Estimate [Line Items] Operating lease liabilities Operating Lease Liability Retained earnings Total cash, cash equivalents, and restricted cash Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents In process and finished products Amount by which inventory stated at last-in first-out (LIFO) is less than (in excess of) inventory stated at current cost Inventory L I F O Reserve Inventories accounted under the LIFO method Percentage Of L I F O Inventory Consignment inventory Other Inventory Materials Supplies And Merchandise Under Consignment Operating lease expiration period. Finance lease expiration period. Lessee Lease Description [Table] Lessee Lease Description [Table] Range Range [Axis] Range Range [Member] Maximum [Member] Maximum [Member] Minimum [Member] Minimum [Member] Credit Facility Credit Facility [Axis] Credit Facility Credit Facility [Domain] Ryerson Credit Facility [Member] Revolving Credit Facility [Member] Lessee Lease Description [Line Items] Lessee Lease Description [Line Items] Noncancelable operating leases expire period Operating Lease Expiration Period Finance leases expire period Finance Lease Expiration Period Real estate leases option to renew description Lessee Operating Lease Option To Extend Real estate leases, Existence of option to extend [true false] Lessee Operating Lease Existence Of Option To Extend Real estate leases option to extend lease term Lessee Operating Lease Renewal Term Revolving credit facility maximum borrowing capacity Line Of Credit Facility Maximum Borrowing Capacity Assets lessee. Operating and finance lease right of use asset. Liabilities lessee. Assets Assets Lessee [Abstract] Finance lease assets Finance Lease Right Of Use Asset Finance lease, Right-of-use asset, Statement of financial position [Extensible List] Finance Lease Right Of Use Asset Statement Of Financial Position Extensible List Total lease assets Operating And Finance Lease Right Of Use Asset Liabilities Liabilities Lessee [Abstract] Operating lease liabilities, current Finance lease liabilities, current Finance Lease Liability Current Finance lease, Liability, Current, Statement of financial position [Extensible List] Finance Lease Liability Current Statement Of Financial Position Extensible List Operating lease liabilities, noncurrent Finance lease liabilities, noncurrent Finance Lease Liability Noncurrent Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Finance Lease Liability Noncurrent Statement Of Financial Position Extensible List Total lease liabilities Operating And Finance Lease Liabilities Property, Plant and Equipment, Type Property Plant And Equipment By Type [Axis] Property, Plant and Equipment, Type Property Plant And Equipment Type [Domain] Assets held under finance leases. Finance Lease [Member] Assets Held Under Finance Leases [Member] Accumulated amortization Income Statement Location Income Statement Location [Axis] Income Statement Location Income Statement Location [Domain] Warehousing, Delivery, Selling, General, and Administrative [Member] Selling General And Administrative Expenses [Member] Interest and debt expense. Interest and Other Expense on Debt [Member] Interest And Debt Expense [Member] Operating lease expense Operating Lease Cost Finance lease expense Finance Lease Cost [Abstract] Amortization of lease assets Finance Lease Right Of Use Asset Amortization Interest on lease liabilities Finance Lease Interest Expense Variable lease expense Variable Lease Cost Short-term lease expense Short Term Lease Cost Total lease expense Lease Cost Operating and finance lease liabilities payments due. Operating Leases Operating Lease Liabilities Payments Due [Abstract] 2019 Lessee Operating Lease Liability Payments Remainder Of Fiscal Year 2020 Lessee Operating Lease Liability Payments Due Year Two 2021 Lessee Operating Lease Liability Payments Due Year Three 2022 Lessee Operating Lease Liability Payments Due Year Four 2023 Lessee Operating Lease Liability Payments Due Year Five After 2023 Lessee Operating Lease Liability Payments Due After Year Five Total lease payments Lessee Operating Lease Liability Payments Due Less: Interest Lessee Operating Lease Liability Undiscounted Excess Amount Present value of lease liabilities Finance Leases Finance Lease Liabilities Payments Due [Abstract] 2019 Finance Lease Liability Payments Remainder Of Fiscal Year 2020 Finance Lease Liability Payments Due Year Two 2021 Finance Lease Liability Payments Due Year Three 2022 Finance Lease Liability Payments Due Year Four 2023 Finance Lease Liability Payments Due Year Five After 2023 Finance Lease Liability Payments Due After Year Five Total lease payments Finance Lease Liability Payments Due Less: Interest Finance Lease Liability Undiscounted Excess Amount Present value of lease liabilities Finance Lease Liability Operating and finance lease liabilities, payments, due. Total Operating And Finance Lease Liabilities Payments Due [Abstract] 2019 Operating And Finance Lease Liabilities Payments Remainder Of Fiscal Year 2020 Operating And Finance Lease Liabilities Payments Due Year Two 2021 Operating And Finance Lease Liabilities Payments Due Year Three 2022 Operating And Finance Lease Liabilities Payments Due Year Four 2023 Operating And Finance Lease Liabilities Payments Due Year Five After 2023 Operating And Finance Lease Liabilities Payments Due After Year Five Total lease payments Operating And Finance Lease Liabilities Payments Due Less: Interest Operating And Finance Lease Liabilities Undiscounted Excess Amount Present value of lease liabilities Lessee, operating lease option to extend lease terms that are reasonably certain of being exercised. Lessee, operating lease, lease not yet commenced, legally binding minimum lease payments. Operating leases with options to extend lease terms that are reasonably certain of being exercised Lessee Operating Lease Option To Extend Lease Terms That Are Reasonably Certain Of Being Exercised Legally binding minimum lease payments for leases signed but not yet commenced Lessee Operating Lease Lease Not Yet Commenced Legally Binding Minimum Lease Payments Operating leases, current portion Finance leases, current portion Operating leases, Weighted-average remaining lease term Operating Lease Weighted Average Remaining Lease Term1 Finance leases, Weighted-average remaining lease term Finance Lease Weighted Average Remaining Lease Term1 Operating leases, Weighted-average discount rate Operating Lease Weighted Average Discount Rate Percent Finance leases, Weighted-average discount rate Finance Lease Weighted Average Discount Rate Percent Cash flow, operating and financing activities, Lessee. Assets obtained in exchange for lease obligations. Cash paid for amounts included in the measurement of lease liabilities Cash Flow Operating And Financing Activities Lessee [Abstract] Operating cash flows from operating leases Operating Lease Payments Operating cash flows from finance leases Finance Lease Interest Payment On Liability Financing cash flows from finance leases Assets obtained in exchange for lease obligations: Assets Obtained In Exchange For Lease Obligations [Abstract] Adoption of accounting principal ASC 842 Operating leases Finance leases Impairment charge Goodwill Impairment Loss Goodwill recognized from business acquisitions Goodwill Acquired During Period Schedule Of Business Acquisitions By Acquisition [Table] Schedule Of Business Acquisitions By Acquisition [Table] Business Acquisition Business Acquisition [Axis] Business Acquisition, Acquiree Business Acquisition Acquiree [Domain] Central Steel and Wire Company. Central Steel & Wire Company [Member] Central Steel And Wire Company [Member] Finite-Lived Intangible Assets by Major Class Finite Lived Intangible Assets By Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name Finite Lived Intangible Assets Major Class Name [Domain] Trademark [Member] Trademarks [Member] Other Income and (Expense), Net [Member] Other Nonoperating Income Expense [Member] Fanello Industries. Fanello Industries [Member] Fanello Industries [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Effective date of acquisition Business Acquisition Effective Date Of Acquisition1 Description of business acquisition Business Acquisition Description Of Acquired Entity Business combination, fair value of consideration Business Combination Consideration Transferred1 Business combination recognized identifiable assets acquired and liabilities assumed salaries wages and commissions. Business combination recognized identifiable assets acquired and liabilities assumed deferred employee benefits. Cash and cash equivalents Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Cash And Equivalents Receivables, less provisions Business Combination Acquired Receivables Fair Value Inventories Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Inventory Prepaid expenses and other current assets Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Current Assets Prepaid Expense And Other Assets Property, plant, and equipment Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Property Plant And Equipment Other intangible assets Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Intangible Assets Other Than Goodwill Total identifiable assets acquired Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Assets Accounts payable Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Current Liabilities Accounts Payable Salaries, wages, and commissions Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Salaries Wages And Commissions Other accrued liabilities Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Current Liabilities Other Deferred income taxes Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deferred Tax Liabilities Deferred employee benefits Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deferred Employee Benefits Total liabilities assumed Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Liabilities Net identifiable assets acquired Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Net Bargain purchase gain Business Combination Bargain Purchase Gain Recognized Amount Total purchase price Business combination, fair value of accounts receivables acquired Business combination, accounts receivables acquired, gross Business Combination Acquired Receivables Gross Contractual Amount Business combination, accounts receivables, expected uncollectible Business Combination Acquired Receivables Estimated Uncollectible Intangibles assets recognized from business acquisitions Finitelived Intangible Assets Acquired1 Business combination, useful life of intangible assets acquired Acquired Finite Lived Intangible Assets Weighted Average Useful Life Bargain purchase gain Business combination, acquisition related fees Business Combination Acquisition Related Costs Revenue Net income Net sales Business Acquisitions Pro Forma Revenue Net income attributable to Ryerson Holding Corporation Business Acquisitions Pro Forma Net Income Loss Debt Instrument [Table] Debt Instrument [Table] Debt Instrument Debt Instrument [Axis] Debt Instrument, Name Debt Instrument Name [Domain] Two thousand twenty two senior notes. 2022 Notes [Member] Two Thousand Twenty Two Senior Notes [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Ryerson Credit Facility Line Of Credit 11.00% Senior Secured Notes due 2022 Senior Notes Foreign debt Foreign Debt Short Term Amount Other debt Other Borrowings Unamortized debt issuance costs and discounts Unamortized Debt Issuance Expense Total debt Debt Longterm And Shortterm Combined Amount Less: Other short-term debt Other Short Term Borrowings Total long-term debt Line of credit facility commitment fee percentage increase (decrease). Old revolving credit facility. Old Revolving Credit Facility [Member] Old Revolving Credit Facility [Member] Amended old credit facility. Amended Old Credit Facility [Member] Amended Old Credit Facility [Member] Legal Entity Legal Entity [Axis] Entity Entity [Domain] US subsidiaries. US Subsidiaries [Member] U S Subsidiaries [Member] Canadian subsidiaries. Canadian Subsidiaries [Member] Canadian Subsidiaries [Member] Variable Rate Variable Rate [Axis] Variable Rate Variable Rate [Domain] Federal funds rate. Federal Funds Rate [Member] Federal Funds Rate [Member] Prime rate and one month LIBOR rate. Prime Rate and One Month LIBOR Rate [Member] Prime Rate And One Month L I B O R Rate [Member] Thirty days LIBOR rate. 30 Day LIBOR Rate [Member] Thirty Days L I B O R Rate [Member] One month Canadian bankers acceptance rate. One Month Canadian Bankers Acceptance Rate [Member] One Month Canadian Bankers Acceptance Rate [Member] Base rate and Canadian prime rate. Base Rate and Canadian Prime Rate [Member] Base Rate And Canadian Prime Rate [Member] LIBOR and Banker's acceptance rate. LIBOR and Banker's Acceptance Rate [Member] Libor And Bankers Acceptance Rate [Member] Derivative Instrument Derivative Instrument Risk [Axis] Derivative Contract Derivative Contract Type [Domain] Interest Rate Swap [Member] Interest Rate Swap [Member] Credit facility maturity date Line Of Credit Facility Expiration Date1 Reduction in interest rate on outstanding borrowing Debt Instrument Interest Rate Increase Decrease Reduction in commitment fees on amounts not borrowed Line Of Credit Facility Commitment Fee Percentage Increase Decrease Outstanding borrowings Letters of credit Letters Of Credit Outstanding Amount Available credit facility Line Of Credit Facility Remaining Borrowing Capacity Line of credit facility, description of collateral Line Of Credit Facility Collateral Interest rate on overdue amounts and during default. Percentage of spread over amount available to be borrowed Debt Instrument Basis Spread On Variable Rate1 Default bear interest rate Interest Rate On Overdue Amounts And During Default Commitment fees on amounts not borrowed Line Of Credit Facility Commitment Fee Percentage Derivative maturity period. Interest rate swap agreement date Derivative Inception Dates Hedged debt amount Derivative Amount Of Hedged Item Derivative fixed interest rate Derivative Fixed Interest Rate Derivative maturity period Derivative Maturity Period Weighted average interest rate Debt Weighted Average Interest Rate Other Income and (Expense), Net [Member] Debt Instrument, Redemption, Period Debt Instrument Redemption Period [Axis] Debt Instrument, Redemption, Period Debt Instrument Redemption Period [Domain] Redeemable in twelve months beginning May 15, 2019 [Member] Debt Instrument Redemption Period Two [Member] Redeemable in twelve months beginning May 15, 2020 [Member] Debt Instrument Redemption Period Three [Member] Redeemable in twelve months beginning May 15, 2021 and thereafter [Member] Debt Instrument Redemption Period Four [Member] Redeemable before May 15, 2019 [Member] Debt Instrument Redemption Period One [Member] Consolidated Entities Consolidated Entities [Axis] Consolidated Entities Consolidated Entities [Domain] Joseph T. Ryerson [Member] Subsidiary Issuer [Member] Aggregate amount of senior notes issued Debt Instrument Face Amount Debt Instrument Percentage Debt Instrument Interest Rate Stated Percentage Principal amount of debt instrument repurchased Debt Instrument Repurchased Face Amount Debt instruments senior notes retired Early Repayment Of Senior Debt Gain (loss) on retirement of debt The portion of the notes that the Company may redeem prior to the debt instrument redemption date with net cash proceeds from certain equity offerings. Debt instrument optional redemption price percentage. Redemption price as a percentage of principal amount Debt Instrument Redemption Price Percentage Optional redemption amount prior to redemption date Optional Redemption Prior To Maturity Additional Percentage Of Principal Optional redemption price as a percentage of principal amount Debt Instrument Optional Redemption Price Percentage Dividend payment threshold of percentage of cumulative net income. Maximum percentage of dividend of cumulative net income Dividend Payment Threshold Of Percentage Of Cumulative Net Income Foreign debt. Foreign Debt [Member] Foreign Debt [Member] Owed to banks. Owed to Banks [Member] Owed To Banks [Member] Ryerson China Limited. Ryerson China [Member] Ryerson China Limited [Member] Letters of credit issued by our foreign subsidiaries Defined Benefit Plans And Other Postretirement Benefit Plans Disclosures [Table] Defined Benefit Plans And Other Postretirement Benefit Plans Disclosures [Table] Pension Benefits [Member] Retirement Plan Type [Axis] Retirement Plan Type Retirement Plan Type [Domain] Pension Benefits [Member] Pension Plans Defined Benefit [Member] Other Benefits [Member] Other Postretirement Benefit Plans Defined Benefit [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] Service cost Defined Benefit Plan Service Cost Interest cost Defined Benefit Plan Interest Cost Expected return on assets Defined Benefit Plan Expected Return On Plan Assets Recognized actuarial (gain) loss Defined Benefit Plan Actuarial Gain Loss Immediate Recognition As Component In Net Periodic Benefit Cost Credit Amortization of prior service credit Defined Benefit Plan Amortization Of Prior Service Cost Credit Net periodic benefit (credit) cost Defined Benefit Plan Net Periodic Benefit Cost Contribution to the pension plan fund Pension Contributions Anticipated minimum required pension contribution funding for the remainder of fiscal period Defined Benefit Plan Expected Future Employer Contributions Remainder Of Fiscal Year Loss contingency on remediation plan of original ROD period. Loss Contingencies [Table] Loss Contingencies [Table] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Record of decision description Loss Contingency Damages Sought Estimated present value cost for construction and recovery Loss Contingency Damages Sought Value Loss contingency on remediation plan of original ROD period Loss Contingency On Remediation Plan Of Original R O D Period Offsetting [Abstract] Fair Values Derivatives Balance Sheet Location By Derivative Contract Type By Hedging Designation [Table] Fair Values Derivatives Balance Sheet Location By Derivative Contract Type By Hedging Designation [Table] Minimum [Member] Derivatives Fair Value [Line Items] Derivatives Fair Value [Line Items] Derivative notional amount Derivative Notional Amount Fair value of interest rate swaps Interest Rate Cash Flow Hedge Derivative At Fair Value Net Hedging Designation Hedging Designation [Axis] Hedging Designation Hedging Designation [Domain] Derivatives Not Designated as Hedging Instruments under ASC 815 [Member] Nondesignated [Member] Metal commodity contracts. Metal Commodity Contracts [Member] Metal Commodity Contracts [Member] Crude Oil Contracts [Member] Energy Related Derivative [Member] Foreign Exchange Contracts [Member] Foreign Exchange Contract [Member] Balance Sheet Location Balance Sheet Location [Axis] Balance Sheet Location Balance Sheet Location [Domain] Prepaid Expenses and Other Current Assets [Member] Prepaid Expenses And Other Current Assets [Member] Other Accrued Liabilities [Member] Other Current Liabilities [Member] Derivatives designated as hedging instruments under ASC 815 [Member] Designated As Hedging Instrument [Member] Deferred charges and other assets [Member] Other Assets [Member] Other Noncurrent Liabilities [Member] Other Liabilities [Member] Asset Derivatives, Fair Value Derivative Assets Liability Derivatives, Fair Value Derivative Liabilities Nickel swap contracts. Nickel Swap Contracts [Member] Nickel Swap Contracts [Member] Hot roll coil swap contracts. Hot Roll Coil Swap Contracts [Member] Hot Roll Coil Swap Contracts [Member] Aluminum swap contracts. Aluminum Swap Contracts [Member] Aluminum Swap Contracts [Member] Iron ore swap contracts. Iron Ore Swap Contracts [Member] Iron Ore Swap Contracts [Member] Crude oil swap contracts. Crude Oil Swap Contracts [Member] Crude Oil Swap Contracts [Member] Derivative Instruments, Notional Value Derivative Nonmonetary Notional Amount Mass Derivative Instruments, Notional Value Derivative Nonmonetary Notional Amount Volume Derivative Instruments Gain Loss By Hedging Relationship By Income Statement Location By Derivative Instrument Risk [Table] Derivative Instruments Gain Loss By Hedging Relationship By Income Statement Location By Derivative Instrument Risk [Table] Cost of Materials Sold [Member] Cost Of Sales [Member] Derivative Instruments Gain Loss [Line Items] Derivative Instruments Gain Loss [Line Items] Amount of Gain/(Loss) Recognized in Income on Derivatives Interest and other expense on debt. Interest and Other Expense on Debt [Member] Interest And Other Expense On Debt [Member] Amount of Gain/(Loss) Reclassified from Accumulated Other Comprehensive Income into Income Derivative Instruments Gain Loss Reclassified From Accumulated O C I Into Income Effective Portion Net Derivative gain (loss) to be reclassified into interest income during next 12 months Interest Rate Cash Flow Hedge Gain Loss To Be Reclassified During Next12 Months Net Fair Value Disclosures [Abstract] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Measurement Frequency Fair Value By Measurement Frequency [Axis] Fair Value, Measurement Frequency Fair Value Measurement Frequency [Domain] Fair Value, Measurements, Recurring [Member] Fair Value Measurements Recurring [Member] Fair Value Hierarchy and NAV Fair Value By Fair Value Hierarchy Level [Axis] Fair Value Hierarchy and NAV Fair Value Measurements Fair Value Hierarchy [Domain] Level 1 [Member] Fair Value Inputs Level1 [Member] Level 2 [Member] Fair Value Inputs Level2 [Member] Level 3 [Member] Fair Value Inputs Level3 [Member] 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] General term for commodity and exchange contracts Derivative Term Of Contract Restricted cash fair value disclosure. Measurement Basis Fair Value By Measurement Basis [Axis] Fair Value Disclosure Item Amounts [Default] Portion At Fair Value Fair Value Disclosure [Member] Fair Value Measurement Fair Value Disclosure Item Amounts [Domain] Carrying Amount [Member] Carrying Reported Amount Fair Value Disclosure [Member] Fair Value [Member] Estimate Of Fair Value Fair Value Disclosure [Member] Cash and cash equivalents Cash And Cash Equivalents Fair Value Disclosure Restricted cash Restricted Cash Fair Value Disclosure Receivables less provisions Receivables Fair Value Disclosure Accounts payable Accounts Payable Fair Value Disclosure Long-term debt, including current portion Debt Instrument Fair Value Other comprehensive income intercompany foreign currency transaction and translation gain (loss). Statement Of Stockholders Equity [Abstract] Statement [Table] Statement [Table] Equity Components Statement Equity Components [Axis] Equity Component Equity Component [Domain] Common Stock [Member] Common Stock [Member] Treasury Stock [Member] Treasury Stock [Member] Capital in Excess of Par Value [Member] Additional Paid In Capital [Member] Retained Earnings (Accumulated Deficit) [Member] Retained Earnings [Member] Foreign Currency Translation [Member] Accumulated Translation Adjustment [Member] Benefit Plan Liabilities [Member] Accumulated Defined Benefit Plans Adjustment [Member] Cash Flow Hedge - Interest Rate Swap [Member] Accumulated Gain Loss Net Cash Flow Hedge Parent [Member] Non-controlling Interest [Member] Noncontrolling Interest [Member] ASC 842 [Member] Accumulated unrealized gains and losses on equity securities. Unrealized Gain (Loss) on Equity Securities [Member] Accumulated Unrealized Gains And Losses On Equity Securities [Member] ASU 2016-01 [Member] Accounting Standards Update201601 [Member] ASC 606 [Member] Accounting Standards Update201409 [Member] Accumulated Other Comprehensive Income (Loss) [Line Items] Statement [Line Items] Beginning Balance Beginning Balance, shares Beginning Balance Treasury Stock, shares Foreign currency translation Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax Foreign currency loss on intra-entity transactions Other Comprehensive Income Intercompany Foreign Currency Transaction And Translation Gain Loss Changes in defined benefit pension and other post-retirement benefit plans, net of tax Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax Adoption of accounting principal Cumulative Effect Of New Accounting Principle In Period Of Adoption Stock-based compensation expense Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value Stock-based compensation expense, shares Stock Issued During Period Shares Employee Stock Ownership Plan Cash flow hedge - interest rate swap, net of tax Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Portion Attributable To Parent Ending Balance Ending Balance, shares Ending Balance Treasury Stock, shares New accounting pronouncement or change in accounting principle effect of change on equity tax. Accumulated Other Comprehensive Income Loss [Table] Accumulated Other Comprehensive Income Loss [Table] ASC 606 [Member] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income Loss [Line Items] Changes in defined benefit pension and other post-retirement benefit plans, tax Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax Changes due to adoption of ASC New Accounting Pronouncement Or Change In Accounting Principle Effect Of Change On Equity Tax Changes in interest rate swap, tax Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax Parent Accumulated other comprehensive income (loss) net of tax, beginning balance Other comprehensive income (loss) before reclassifications Other Comprehensive Income Loss Before Reclassifications Net Of Tax Amounts reclassified from accumulated other comprehensive income into net income Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax Net current-period other comprehensive income (loss) Other Comprehensive Income Loss Net Of Tax Accumulated other comprehensive income (loss) net of tax, ending balance Reclassification Out Of Accumulated Other Comprehensive Income [Table] Reclassification Out Of Accumulated Other Comprehensive Income [Table] Amortization of Defined Benefit Pension and Other Post-retirement Benefit Plan Items, Actuarial Loss [Member] Accumulated Defined Benefit Plans Adjustment Net Gain Loss Including Portion Attributable To Noncontrolling Interest [Member] Amortization of Defined Benefit Pension and Other Post-retirement Benefit Plan Items, Prior Service Credits [Member] Accumulated Defined Benefit Plans Adjustment Net Prior Service Including Portion Attributable To Noncontrolling Interest [Member] Amortization of Defined Benefit Pension and Other Post-retirement Benefit Plan Items [Member] Accumulated Defined Benefit Plans Adjustment Including Portion Attributable To Noncontrolling Interest [Member] Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] Reclassifications out of AOCI Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax Tax benefit Reclassification From Aoci Current Period Tax Net of tax Realized swap interest loss Other Comprehensive Income Loss Reclassification Adjustment From A O C I On Derivatives Before Tax Tax benefit Other Comprehensive Income Loss Reclassification Adjustment From A O C I On Derivatives Tax Net of tax Other Comprehensive Income Loss Reclassification Adjustment From A O C I On Derivatives Net Of Tax Percentage of metal products sales processed. Revenue Initial Application Period Cumulative Effect Transition [Table] Revenue Initial Application Period Cumulative Effect Transition [Table] Revenue Initial Application Period Cumulative Effect Transition [Line Items] Revenue Initial Application Period Cumulative Effect Transition [Line Items] Percentage of revenue from product sales Percentage Of Metal Products Sales Processed Number of operating segments Number Of Operating Segments Number of reportable segments Number Of Reportable Segments Percentage of sales by major product lines. Schedule Of Product Information [Table] Schedule Of Product Information [Table] Product and Service Product Or Service [Axis] Product and Service Products And Services [Domain] Carbon steel flat. Carbon Steel Flat [Member] Carbon Steel Flat [Member] Carbon steel plate. Carbon Steel Plate [Member] Carbon Steel Plate [Member] Carbon steel long. Carbon Steel Long [Member] Carbon Steel Long [Member] Stainless steel flat. Stainless Steel Flat [Member] Stainless Steel Flat [Member] Stainless steel plate. Stainless Steel Plate [Member] Stainless Steel Plate [Member] Stainless steel long. Stainless Steel Long [Member] Stainless Steel Long [Member] Aluminum flat. Aluminum Flat [Member] Aluminum Flat [Member] Aluminum plate. Aluminum Plate [Member] Aluminum Plate [Member] Aluminum long. Aluminum Long [Member] Aluminum Long [Member] Others. Other [Member] Others [Member] Product Line Product Information [Line Items] Percentage of sales by major product lines Percentage Of Sales By Major Product Lines Disaggregation Of Revenue [Table] Disaggregation Of Revenue [Table] Geographical Statement Geographical [Axis] Geographical Segment Geographical [Domain] United States [Member] UNITED STATES Foreign Countries [Member] Non Us [Member] Disaggregation Of Revenue [Line Items] Disaggregation Of Revenue [Line Items] Timing of revenue recognition percentage of products with an alternative use. Timing of revenue recognition percentage of products with no alternative use.. Timing of revenue recognition percentage of products. Timing of Transfer of Good or Service Timing Of Transfer Of Good Or Service [Axis] Timing of Transfer of Good or Service Timing Of Transfer Of Good Or Service [Domain] Revenue Recognized Point In Time Transferred At Point In Time [Member] Revenue Recognized Over Time Transferred Over Time [Member] Revenue on products with an alternative use Timing Of Revenue Recognition Percentage Of Products With Alternative Use Revenue on products with no alternative use Timing Of Revenue Recognition Percentage Of Products With No Alternative Use Total Timing Of Revenue Recognition Percentage Of Products Payment terms on invoiced amounts Revenue Performance Obligation Description Of Payment Terms Accounts receivables from contracts with customers Accounts Receivable Gross Current Contract with customer, assets, contract assets for products with no alternative during period. Contract with customer, assets, changes to reserves. Revenue From Contract With Customer [Abstract] Changes in the Contract Assets Change In Contract With Customer Asset [Abstract] Beginning Balance Contract With Customer Asset Net Net contract assets added for products with no alternative during the period Contract With Customer Assets Contract Assets For Products With No Alternative During Period Changes to reserves Contract With Customer Assets Changes To Reserves Ending Balance Contract with customer liability incurred. Contract with customer liabilities contract liabilities for products with no alternative during period. Contract with customer, liability, changes to reserves. Changes in the Contract Liabilities Change In Contract With Customer Liability [Abstract] Beginning Balance Contract With Customer Liability Satisfied contract liability from beginning of the period Contract With Customer Liability Change In Timeframe Performance Obligation Satisfied Revenue Recognized Contract liability incurred during the period Contract With Customer Liability Incurred Net contract liabilities added for products with no alternative during the period Contract With Customer Liabilities Contract Liabilities For Products With No Alternative During Period Changes to reserves Contract With Customer Liability Changes To Reserves Ending Balance Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Start Date [Axis] Performance obligations on contracts have expected duration Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 Income tax. Income tax. Income Tax [Table] Income Tax [Table] Income Tax Authority Income Tax Authority [Axis] Income Tax Authority Income Tax Authority [Domain] Global intangible low-taxed income. GILTI [Member] Global Intangible Low Taxed Income [Member] Income Tax [Line Items] Income Tax [Line Items] Provision for income taxes Valuation allowance Deferred Tax Assets Valuation Allowance Numerator: Net Income Loss [Abstract] Net income attributable to Ryerson Holding Corporation Denominator: Weighted Average Number Of Shares Outstanding [Abstract] Weighted average shares outstanding Weighted Average Number Of Shares Outstanding Basic Dilutive effect of stock-based awards Incremental Common Shares Attributable To Share Based Payment Arrangements Weighted average shares outstanding adjusted for dilutive securities Weighted Average Number Of Diluted Shares Outstanding Earnings per share Earnings Per Share Basic And Diluted [Abstract] Basic Diluted