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Environmental Obligations - Recoveries and Reserves (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Recorded Recoveries [Roll Forward]                        
Beginning balance       $ 20.3       $ 15.9 $ 20.3 $ 15.9    
Increase (Decrease) in Recoveries                 (1.0) 5.0    
Cash Received                 (4.7) (0.6)    
Ending balance $ 14.6       $ 20.3       14.6 20.3 $ 15.9  
Accrual for Environmental Loss Contingencies [Roll Forward]                        
Environmental reserves, current, net of recoveries 97.4       90.1       97.4 90.1    
Environmental reserves, long-term continuing and discontinued, net of recoveries 494.7       439.1       494.7 439.1    
Total environmental reserves, net of recoveries 592.1       529.2       592.1 529.2 503.2 $ 564.4
Net Environmental Provisions [Abstract]                        
Continuing operations                 66.9 34.7 27.1  
Discontinued operations                 83.6 67.6 37.9  
Net environmental provision                 150.5 102.3 65.0  
Discontinued operations, net of income taxes 57.2 $ 8.3 $ 21.5 11.5 55.0 $ 16.2 $ 10.8 15.2 98.5 97.2 68.2  
Net Environmental Provisions, Assets and Liabilities [Abstract]                        
Environmental reserves                 152.3 104.8 65.8  
Other assets                 (1.8) (2.5) (0.8)  
Net environmental provision                 150.5 102.3 65.0  
Discontinued Foreign Environmental Liabilities                        
Net Environmental Provisions [Abstract]                        
Discontinued operations, net of income taxes                 11.7      
Environmental liabilities, continuing and discontinued                        
Recorded Recoveries [Roll Forward]                        
Beginning balance       13.9       11.4 13.9 11.4    
Increase (Decrease) in Recoveries                 (3.1) 2.5    
Cash Received                 (1.1) 0.0    
Ending balance 9.7       13.9       9.7 13.9 11.4  
Other assets                        
Recorded Recoveries [Roll Forward]                        
Beginning balance       $ 6.4       $ 4.5 6.4 4.5    
Increase (Decrease) in Recoveries                 2.1 2.5    
Cash Received                 (3.6) (0.6)    
Ending balance $ 4.9       $ 6.4       $ 4.9 $ 6.4 $ 4.5