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Environmental Obligations - Recoveries and Reserves (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Recorded Recoveries [Roll Forward]          
Beginning balance $ 14.7 $ 14.7 $ 37.3    
Increase (Decrease) in Recoveries   2.6 (0.9)    
Cash Received (2)   (1.4) (21.7)    
Other     0.0    
Ending balance   15.9 14.7 $ 37.3  
Litigation settlement 20.0        
Accrual for Environmental Loss Contingencies, Balance Sheet Classification [Abstract]          
Environmental reserves, current, net of recoveries   87.3 120.9    
Environmental reserves, long-term continuing and discontinued, net of recoveries   415.9 443.5    
Total environmental reserves, net of recoveries   503.2 564.4 585.8 $ 521.5
Net Environmental Provisions [Abstract]          
Continuing operations   27.1 24.9 108.7  
Discontinued operations   37.9 30.1 29.8  
Net environmental provision   65.0 55.0 138.5  
Net Environmental Provisions, Assets and Liabilities [Abstract]          
Environmental reserves   65.8 53.2 138.8  
Other assets   (0.8) 1.8 (0.3)  
Net environmental provision   65.0 55.0 138.5  
Other Assets Including Long-term Receivables, Net          
Recorded Recoveries [Roll Forward]          
Beginning balance 10.3 10.3 10.0    
Increase (Decrease) in Recoveries   1.8 0.9    
Cash Received (2)   (0.7) (0.6)    
Other     0.0    
Ending balance   11.4 10.3 10.0  
Other assets          
Recorded Recoveries [Roll Forward]          
Beginning balance $ 4.4 4.4 27.3    
Increase (Decrease) in Recoveries   0.8 (1.8)    
Cash Received (2)   (0.7) (21.1)    
Other     0.0    
Ending balance   $ 4.5 $ 4.4 $ 27.3