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Environmental Obligations - Recoveries and Reserves (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Recorded Recoveries [Roll Forward]          
Beginning balance $ 37.3 $ 37.3 $ 38.4    
Increase (Decrease) in Recoveries   (0.9) 2.9    
Cash Received   (21.7) (4.3)    
Other     0.3    
Ending balance   14.7 37.3 $ 38.4  
Litigation settlement 20.0        
Accrual for Environmental Loss Contingencies, Balance Sheet Classification [Abstract]          
Environmental reserves, current, net of recoveries   120.9 115.3    
Environmental reserves, long-term continuing and discontinued, net of recoveries   443.5 470.5    
Total environmental reserves, net of recoveries   564.4 585.8 521.5 $ 411.8
Net Environmental Provisions [Abstract]          
Continuing operations   24.9 108.7 21.7  
Discontinued operations   30.1 29.8 153.9  
Net environmental provision   55.0 138.5 175.6  
Net Environmental Provisions, Assets and Liabilities [Abstract]          
Environmental reserves   53.2 138.8 178.2  
Other assets   1.8 (0.3) (2.6)  
Net environmental provision   55.0 138.5 175.6  
Other Assets Including Long-term Receivables, Net          
Recorded Recoveries [Roll Forward]          
Beginning balance 10.0 10.0 7.9    
Increase (Decrease) in Recoveries   0.9 2.6    
Cash Received   (0.6) (0.5)    
Other     0.0    
Ending balance   10.3 10.0 7.9  
Other assets          
Recorded Recoveries [Roll Forward]          
Beginning balance $ 27.3 27.3 30.5    
Increase (Decrease) in Recoveries   (1.8) 0.3    
Cash Received   (21.1) (3.8)    
Other     0.3    
Ending balance   $ 4.4 $ 27.3 $ 30.5