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Environmental Obligations - Environmental Reserve Rollforward and Recoveries and Reserves (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Accrual for Environmental Loss Contingencies [Roll Forward]          
Environmental reserves, long-term $ 416.0   $ 416.0   $ 439.1
Recorded Recoveries [Roll Forward]          
Environmental charges, net 4.5 $ 3.4 14.3 $ 1.0  
Environmental provision, net 6.7 7.2 34.9 8.4  
Continuing Operations          
Recorded Recoveries [Roll Forward]          
Environmental charges, net 4.5 3.4 14.3 1.0  
Discontinued Operations          
Recorded Recoveries [Roll Forward]          
Environmental charges, net 2.2 3.8 20.6 7.4  
Discontinued Foreign Operations          
Recorded Recoveries [Roll Forward]          
Environmental charges, net 11.7   11.7    
Other Assets Including Long-term Receivables, Net          
Recorded Recoveries [Roll Forward]          
Environmental recoveries, beginning     6.4    
Increase (Decrease) in recoveries     0.8    
Cash received     (3.3)    
Environmental recoveries, ending 3.9   3.9    
Other Liabilities          
Recorded Recoveries [Roll Forward]          
Environmental remediation provision, net 7.6 7.3 35.8 10.4  
Other Assets          
Recorded Recoveries [Roll Forward]          
Environmental remediation provision, net (0.9) $ (0.1) (0.9) $ (2.0)  
Gross          
Accrual for Environmental Loss Contingencies [Roll Forward]          
Total environmental reserves at December 31, 2022     543.1    
Provision (Benefit)     36.4    
(Spending) Recoveries     (61.4)    
Foreign currency translation adjustments     (1.0)    
Net change     (26.0)    
Total environmental reserves at September 30, 2023 517.1   517.1    
Environmental reserves, current 88.3   88.3    
Environmental reserves, long-term 428.8   428.8    
Total environmental reserves at September 30, 2023 517.1   517.1   543.1
Recoveries          
Accrual for Environmental Loss Contingencies [Roll Forward]          
Total environmental reserves at December 31, 2022     13.9    
Provision (Benefit)     (0.6)    
(Spending) Recoveries     1.0    
Foreign currency translation adjustments     0.0    
Net change     0.4    
Total environmental reserves at September 30, 2023 13.5   13.5    
Environmental reserves, current 0.7   0.7    
Environmental reserves, long-term 12.8   12.8    
Total environmental reserves at September 30, 2023 13.5   13.5   13.9
Net          
Accrual for Environmental Loss Contingencies [Roll Forward]          
Total environmental reserves at December 31, 2022     529.2    
Provision (Benefit)     35.8    
(Spending) Recoveries     (60.4)    
Foreign currency translation adjustments     (1.0)    
Net change     (25.6)    
Total environmental reserves at September 30, 2023 503.6   503.6    
Environmental reserves, current 87.6   87.6    
Environmental reserves, long-term 416.0   416.0    
Total environmental reserves at September 30, 2023 $ 503.6   $ 503.6   $ 529.2