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Environmental Obligations - Environmental Reserve Rollforward and Recoveries and Reserves (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Accrual for Environmental Loss Contingencies [Roll Forward]          
Environmental reserves, long-term $ 430.6   $ 430.6   $ 439.1
Recorded Recoveries [Roll Forward]          
Environmental charges, net 7.5 $ 0.9 9.8 $ (2.4)  
Environmental provision, net 22.8 1.8 27.8 1.2  
Continuing Operations          
Recorded Recoveries [Roll Forward]          
Environmental charges, net 7.5 0.9 9.8 (2.4)  
Discontinued Operations          
Recorded Recoveries [Roll Forward]          
Environmental charges, net 15.3 0.9 18.0 3.6  
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     0.4    
Cash received     (1.1)    
Environmental recoveries, ending 5.7   5.7    
Other Liabilities          
Recorded Recoveries [Roll Forward]          
Environmental remediation provision, net 22.9 3.7 28.2 3.1  
Other Assets          
Recorded Recoveries [Roll Forward]          
Environmental remediation provision, net (0.1) $ (1.9) (0.4) $ (1.9)  
Gross          
Accrual for Environmental Loss Contingencies [Roll Forward]          
Total environmental reserves at December 31, 2022     543.1    
Provision (Benefit)     28.6    
(Spending) Recoveries     (28.4)    
Foreign currency translation adjustments     1.9    
Net change     2.1    
Total environmental reserves at June 30, 2023 545.2   545.2    
Environmental reserves, current 101.7   101.7    
Environmental reserves, long-term 443.5   443.5    
Total environmental reserves at June 30, 2023 545.2   545.2   543.1
Recoveries          
Accrual for Environmental Loss Contingencies [Roll Forward]          
Total environmental reserves at December 31, 2022     13.9    
Provision (Benefit)     (0.4)    
(Spending) Recoveries     1.1    
Foreign currency translation adjustments     0.0    
Net change     0.7    
Total environmental reserves at June 30, 2023 13.2   13.2    
Environmental reserves, current 0.3   0.3    
Environmental reserves, long-term 12.9   12.9    
Total environmental reserves at June 30, 2023 13.2   13.2   13.9
Net          
Accrual for Environmental Loss Contingencies [Roll Forward]          
Total environmental reserves at December 31, 2022     529.2    
Provision (Benefit)     28.2    
(Spending) Recoveries     (27.3)    
Foreign currency translation adjustments     1.9    
Net change     2.8    
Total environmental reserves at June 30, 2023 532.0   532.0    
Environmental reserves, current 101.4   101.4    
Environmental reserves, long-term 430.6   430.6    
Total environmental reserves at June 30, 2023 $ 532.0   $ 532.0   $ 529.2