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Long-Term Debt - Ryerson Credit Facility - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended
Nov. 05, 2020
Nov. 30, 2019
Jun. 30, 2019
Mar. 31, 2022
Dec. 31, 2021
Ryerson Credit Facility [Member]          
Debt Instrument [Line Items]          
Revolving credit facility maximum borrowing capacity $ 1,000,000,000.0        
Credit facility maturity date Nov. 05, 2025        
Outstanding borrowings       $ 294,000,000.0 $ 316,000,000.0
Letters of credit       14,000,000 14,000,000
Available credit facility       $ 691,000,000 $ 670,000,000
Line of credit facility, description of collateral       Total credit availability is limited by the amount of eligible accounts receivable, inventory, and qualified cash pledged as collateral under the agreement insofar as Ryerson is subject to a borrowing base comprised of the aggregate of these three amounts, less applicable reserves. Eligible accounts receivable, at any date of determination, is comprised of the aggregate value of all accounts directly created by a borrower in the ordinary course of business arising out of the sale of goods or the rendering of services, each of which has been invoiced, with such receivables adjusted to exclude various ineligible accounts, including, among other things, those to which a borrower (or guarantor, as applicable) does not have sole and absolute title and accounts arising out of a sale to an employee, officer, director, or affiliate of a borrower (or guarantor, as applicable). Eligible inventory, at any date of determination, is comprised of the net orderly liquidation value of all inventory owned by a borrower. Qualified cash consists of cash in an eligible deposit account that is subject to customary restrictions and liens in favor of the lenders.  
Default bear interest rate       2.00%  
Commitment fees on amounts not borrowed       0.225%  
Ryerson Credit Facility [Member] | First Interest Rate Swap [Member]          
Debt Instrument [Line Items]          
Interest rate swap agreement date     2019-06    
Hedged debt amount     $ 60,000,000    
Derivative fixed interest rate     1.729%    
Derivative maturity period     2022-06    
Ryerson Credit Facility [Member] | Second Interest Rate Swap [Member]          
Debt Instrument [Line Items]          
Interest rate swap agreement date   2019-11      
Hedged debt amount   $ 100,000,000      
Derivative fixed interest rate   1.539%      
Derivative maturity period   2022-11      
Ryerson Credit Facility [Member] | All Interest Rate Swap [Member]          
Debt Instrument [Line Items]          
Weighted average interest rate       3.00% 2.50%
Ryerson Credit Facility [Member] | Federal Funds Rate [Member]          
Debt Instrument [Line Items]          
Spread over base interest rate       0.50%  
Ryerson Credit Facility [Member] | Base Rate          
Debt Instrument [Line Items]          
Fixed floor of the base rate       1.25%  
Ryerson Credit Facility [Member] | Prime Rate and One Month LIBOR Rate [Member]          
Debt Instrument [Line Items]          
Spread over base interest rate       1.00%  
Ryerson Credit Facility [Member] | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Fixed floor of the LIBOR rate       0.25%  
Ryerson Credit Facility [Member] | 30 Day LIBOR Rate [Member]          
Debt Instrument [Line Items]          
Spread over base interest rate       1.00%  
Ryerson Credit Facility [Member] | Canadian Subsidiaries [Member] | One Month Canadian Bankers Acceptance Rate [Member]          
Debt Instrument [Line Items]          
Spread over base interest rate       1.00%  
Ryerson Credit Facility [Member] | Canadian Subsidiaries [Member] | Banker's Acceptance Rate [Member]          
Debt Instrument [Line Items]          
Fixed floor of Canadian base rate or Canadian prime rate       1.25%  
Ryerson Credit Facility [Member] | Minimum [Member] | Canadian Subsidiaries [Member] | Base Rate And Canadian Prime Rate          
Debt Instrument [Line Items]          
Fixed floor of Canadian base rate or Canadian prime rate       0.25%  
Old Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Credit facility maturity date Nov. 16, 2021        
First In Last Out Subfacility | Ryerson Credit Facility [Member]          
Debt Instrument [Line Items]          
Amount of borrow under FILO Facility $ 100,000,000        
After November 5, 2021 [Member] | Ryerson Credit Facility [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Spread over base interest rate       1.25%  
After November 5, 2021 [Member] | Ryerson Credit Facility [Member] | Minimum [Member] | Base Rate and Prime Rate [Member]          
Debt Instrument [Line Items]          
Spread over base interest rate       0.25%  
After November 5, 2021 [Member] | Ryerson Credit Facility [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Spread over base interest rate       0.50%  
After November 5, 2021 [Member] | Ryerson Credit Facility [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Spread over base interest rate       1.50%  
Until November 5, 2021 [Member] | Ryerson Credit Facility [Member] | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Spread over base interest rate       1.50%  
Until November 5, 2021 [Member] | Ryerson Credit Facility [Member] | Minimum [Member] | Base Rate And Canadian Prime Rate          
Debt Instrument [Line Items]          
Spread over base interest rate       0.50%