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Environmental Obligations - Recoveries and Reserves (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Recorded Recoveries [Roll Forward]                        
Beginning balance       $ 9.7       $ 13.9 $ 9.7 $ 13.9    
Increase (Decrease) in Recoveries                 0.5 (3.1)    
Cash Received                 (0.1) (1.1)    
Ending balance $ 10.1       $ 9.7       10.1 9.7 $ 13.9  
Beginning balance       4.9       6.4 4.9 6.4    
Increase (Decrease) in Recoveries                 (0.1) 2.1    
Cash Received                 (1.0) (3.6)    
Ending balance 3.8       4.9       3.8 4.9 6.4  
Beginning balance       14.6       20.3 14.6 20.3    
Increase (Decrease) in Recoveries                 0.4 (1.0)    
Cash Received                 (1.1) (4.7)    
Ending balance 13.9       14.6       13.9 14.6 20.3  
Accrual for Environmental Loss Contingencies [Roll Forward]                        
Environmental reserves, current, net of recoveries 91.8       97.4       91.8 97.4    
Environmental reserves, long-term continuing and discontinued, net of recoveries 521.3       494.7       521.3 494.7    
Total environmental reserves, net of recoveries 613.1       592.1       613.1 592.1 529.2 $ 503.2
Net Environmental Provisions [Abstract]                        
Environmental charges, net                 74.7 66.9 34.7  
Net environmental provision                 116.2 150.5 102.3  
Discontinued operations, net of income taxes $ 45.6 $ 0.9 $ 2.8 $ 12.5 $ 57.2 $ 8.3 $ 21.5 $ 11.5 61.8 98.5 97.2  
Net Environmental Provisions, Assets and Liabilities [Abstract]                        
Environmental reserves                 116.0 152.3 104.8  
Other assets                 0.2 (1.8) (2.5)  
Net environmental provision                 116.2 150.5 102.3  
Continuing operations                        
Net Environmental Provisions [Abstract]                        
Environmental charges, net                 74.7 66.9 34.7  
Discontinued operations                        
Net Environmental Provisions [Abstract]                        
Environmental charges, net                 $ 41.5 83.6 $ 67.6  
Discontinued Foreign Environmental Liabilities                        
Net Environmental Provisions [Abstract]                        
Discontinued operations, net of income taxes                   $ 11.7