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Revenue Recognition (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Disaggregation of Revenue [Line Items]        
Net sales $ 274.2 $ 409.9 $ 981.9 $ 1,204.2
Bar        
Disaggregation of Revenue [Line Items]        
Net sales 179.7 262.2 645.0 759.0
Tube        
Disaggregation of Revenue [Line Items]        
Net sales 32.2 66.7 122.6 201.0
Value-add        
Disaggregation of Revenue [Line Items]        
Net sales 55.9 70.6 192.7 212.5
Other        
Disaggregation of Revenue [Line Items]        
Net sales 6.4 10.4 21.6 31.7
Mobile        
Disaggregation of Revenue [Line Items]        
Net sales 110.2 136.4 389.7 420.5
Industrial        
Disaggregation of Revenue [Line Items]        
Net sales 116.9 169.7 388.2 484.3
Energy        
Disaggregation of Revenue [Line Items]        
Net sales 32.6 70.1 147.5 188.0
Other        
Disaggregation of Revenue [Line Items]        
Net sales $ 14.5 $ 33.7 $ 56.5 $ 111.4