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Environmental Obligations - Recoveries and Reserves (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Recorded Recoveries [Roll Forward]        
Beginning balance $ 15.9 $ 14.7    
Increase (Decrease) in Recoveries 5.0 2.6    
Cash Received (0.6) (1.4)    
Ending balance 20.3 15.9 $ 14.7  
Accrual for Environmental Loss Contingencies [Roll Forward]        
Environmental reserves, current, net of recoveries 90.1 87.3    
Environmental reserves, long-term continuing and discontinued, net of recoveries 439.1 415.9    
Total environmental reserves, net of recoveries 529.2 503.2 564.4 $ 585.8
Net Environmental Provisions [Abstract]        
Continuing operations 34.7 27.1 24.9  
Discontinued operations 67.6 37.9 30.1  
Net environmental provision 102.3 65.0 55.0  
Net Environmental Provisions, Assets and Liabilities [Abstract]        
Environmental reserves 104.8 65.8 53.2  
Other assets (2.5) (0.8) 1.8  
Net environmental provision 102.3 65.0 55.0  
Other Assets Including Long-term Receivables, Net        
Recorded Recoveries [Roll Forward]        
Beginning balance 11.4 10.3    
Increase (Decrease) in Recoveries 2.5 1.8    
Cash Received 0.0 (0.7)    
Ending balance 13.9 11.4 10.3  
Other assets        
Recorded Recoveries [Roll Forward]        
Beginning balance 4.5 4.4    
Increase (Decrease) in Recoveries 2.5 0.8    
Cash Received (0.6) (0.7)    
Ending balance $ 6.4 $ 4.5 $ 4.4