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Revenues (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Revenue Disaggregation    
Revenue $ 2,956.6 $ 2,757.1
Carbon steel    
Revenue Disaggregation    
Revenue 1,593.6 1,461.2
Aluminum    
Revenue Disaggregation    
Revenue 565.8 550.2
Stainless steel    
Revenue Disaggregation    
Revenue 406.5 403.2
Alloy    
Revenue Disaggregation    
Revenue 184.3 169.0
Toll processing and logistics    
Revenue Disaggregation    
Revenue 111.7 101.1
Other    
Revenue Disaggregation    
Revenue $ 94.7 $ 72.4