v3.26.1
Long-Term Debt - Ryerson Credit Facility - Additional Information (Detail) - USD ($)
6 Months Ended
Feb. 13, 2026
Jun. 30, 2026
Feb. 14, 2026
Dec. 31, 2025
Ryerson Credit Facility [Member]        
Debt Instrument [Line Items]        
Revolving credit facility maximum borrowing capacity $ 1,300,000,000   $ 1,800,000,000  
Credit facility maturity date Feb. 13, 2031      
Outstanding borrowings   $ 962,000,000   $ 463,200,000
Letters of credit   7,000,000   1,000,000
Available credit facility   $ 668,000,000   $ 428,000,000
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 the Company 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 or guarantor 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. Eligible inventory, at any date of determination, is comprised of the net orderly liquidation value of all inventory owned by a borrower or guarantor located in the United States and Canada and certain in-transit inventory. Qualified cash consists of cash in an eligible deposit account that is subject to customary restrictions and liens in favor of the lenders.    
Debt instrument basis spread reduction rate   0.125%    
Debt instrument basis spread leverage ratio   3.5    
Default bear interest rate   2.00%    
Commitment fees on amounts not borrowed   0.20%    
Weighted average interest rate   4.90%   5.20%
Ryerson Credit Facility [Member] | Base Rate [Member]        
Debt Instrument [Line Items]        
Spread over base interest rate   0.25%    
Ryerson Credit Facility [Member] | Prime Rate [Member]        
Debt Instrument [Line Items]        
Spread over base interest rate   0.50%    
Ryerson Credit Facility [Member] | SOFR Rate [Member]        
Debt Instrument [Line Items]        
Spread over base interest rate   1.25%    
Ryerson Credit Facility [Member] | CORRA Rate [Member]        
Debt Instrument [Line Items]        
Spread over base interest rate   1.50%    
Ryerson Credit Facility [Member] | US Borrower [Member] | Federal Funds Rate [Member]        
Debt Instrument [Line Items]        
Spread over base interest rate   0.50%    
Ryerson Credit Facility [Member] | US Borrower [Member] | One-month Term SOFR Rate [Member]        
Debt Instrument [Line Items]        
Spread over base interest rate   1.00%    
Ryerson Credit Facility [Member] | US Borrower [Member] | Prime Rate [Member]        
Debt Instrument [Line Items]        
Spread over base interest rate   0.50%    
Ryerson Credit Facility [Member] | Canadian Borrower [Member] | One-month Term SOFR Rate [Member]        
Debt Instrument [Line Items]        
Spread over base interest rate   1.00%    
Old Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Credit facility maturity date Jun. 29, 2027