Investments, Long-Term Receivables and Equity Investee Transactions - Investees Accounted for using Equity Method (Details) - U.S.	Dec. 31, 2021
Chrome Deposit Corporation
Schedule of Equity Method Investments [Line Items]
Percentage of ownership in equity investees	50.00%
Daniel Ross Bridge, LLC
Schedule of Equity Method Investments [Line Items]
Percentage of ownership in equity investees	50.00%
Double G Coatings Company, Inc.
Schedule of Equity Method Investments [Line Items]
Percentage of ownership in equity investees	50.00%
Hibbing Development Company
Schedule of Equity Method Investments [Line Items]
Percentage of ownership in equity investees	24.10%
Hibbing Taconite Company(a)
Schedule of Equity Method Investments [Line Items]
Percentage of ownership in equity investees	14.70%
Patriot Premium Threading Services, LLC
Schedule of Equity Method Investments [Line Items]
Percentage of ownership in equity investees	50.00%
PRO-TEC Coating Company, LLC
Schedule of Equity Method Investments [Line Items]
Percentage of ownership in equity investees	50.00%
Strategic Investment Fund Partners II(b)
Schedule of Equity Method Investments [Line Items]
Percentage of ownership in equity investees	5.20%
Worthington Specialty Processing
Schedule of Equity Method Investments [Line Items]
Percentage of ownership in equity investees	49.00%