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Long-Term Debt - Foreign Debt - Additional Information (Detail) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Debt Instrument [Line Items]    
Foreign debt $ 17.3 $ 27.0
Foreign Debt [Member]    
Debt Instrument [Line Items]    
Available credit facility 36.0 20.0
Letters of credit issued by our foreign subsidiaries 3.0 6.0
Foreign Debt [Member] | Owed to Banks [Member] | Ryerson China [Member]    
Debt Instrument [Line Items]    
Foreign debt $ 17.3 $ 27.0
Weighted average interest rate 3.50% 3.60%