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Joint Ventures and Noncontrolling Interests (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Mar. 30, 2020
Dec. 31, 2019
Joint Ventures and Noncontrolling Interests            
Equity   $ 7,095.9 $ 6,093.7 $ 5,122.7   $ 5,214.1
Feralloy Processing Company            
Joint Ventures and Noncontrolling Interests            
Equity $ (5.5)          
Payments for acquired equity interest 8.0          
Carrying value of noncontrolling interest 1.1          
Increase to additional paid in capital for the direct tax effects resulting from the transaction $ 1.4          
Ownership percentage acquired 49.00%          
Ownership percentage in consolidated investments other than equity method investment 100.00%       51.00%  
Indiana Pickling & Processing Company            
Joint Ventures and Noncontrolling Interests            
Ownership percentage in consolidated investments other than equity method investment   56.00%        
Valex Corp. | South Korea            
Joint Ventures and Noncontrolling Interests            
Ownership percentage in consolidated investments other than equity method investment   96.00%        
Minimum            
Joint Ventures and Noncontrolling Interests            
Ownership percentage of investee for accounting under the equity method of accounting   20.00%        
Percentage of ownership for consolidation of financial statements   50.00%        
Maximum            
Joint Ventures and Noncontrolling Interests            
Ownership percentage of investee for accounting under the equity method of accounting   50.00%