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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Accrual for Environmental Loss Contingencies [Roll Forward]          
Environmental reserves, long-term $ 413.3   $ 413.3   $ 443.5
Recorded Recoveries [Roll Forward]          
Environmental charges, net 3.7 $ 3.3 (0.4) $ 9.7  
Environmental provision, net 7.9 6.6 6.9 15.4  
Continuing Operations          
Recorded Recoveries [Roll Forward]          
Environmental charges, net 3.7 3.3 (0.4) 9.7  
Discontinued Operations          
Recorded Recoveries [Roll Forward]          
Environmental charges, net 4.2 3.3 7.3 5.7  
Other Assets Including Long-term Receivables, Net          
Recorded Recoveries [Roll Forward]          
Environmental recoveries, beginning     4.4    
Increase (Decrease) in recoveries     0.6    
Cash received     (0.1)    
Environmental recoveries, ending 4.9   4.9    
Other Liabilities          
Recorded Recoveries [Roll Forward]          
Environmental remediation provision, net 8.4 6.7 7.5 12.0  
Other Assets          
Recorded Recoveries [Roll Forward]          
Environmental remediation provision, net (0.5) $ (0.1) (0.6) $ 3.4  
Gross          
Accrual for Environmental Loss Contingencies [Roll Forward]          
Total environmental reserves at December 31, 2020     574.7    
Provision (Benefit)     7.8    
(Spending) Recoveries     (67.4)    
Foreign currency translation adjustments     (2.3)    
Net change     (61.9)    
Total environmental reserves at June 30, 2021 512.8   512.8    
Environmental reserves, current 89.9   89.9    
Environmental reserves, long-term 422.9   422.9    
Total environmental reserves at June 30, 2021 512.8   512.8   574.7
Recoveries          
Accrual for Environmental Loss Contingencies [Roll Forward]          
Total environmental reserves at December 31, 2020     10.3    
Provision (Benefit)     (0.3)    
(Spending) Recoveries     0.0    
Foreign currency translation adjustments     0.0    
Net change     (0.3)    
Total environmental reserves at June 30, 2021 10.6   10.6    
Environmental reserves, current 1.0   1.0    
Environmental reserves, long-term 9.6   9.6    
Total environmental reserves at June 30, 2021 10.6   10.6   10.3
Net          
Accrual for Environmental Loss Contingencies [Roll Forward]          
Total environmental reserves at December 31, 2020     564.4    
Provision (Benefit)     7.5    
(Spending) Recoveries     (67.4)    
Foreign currency translation adjustments     (2.3)    
Net change     (62.2)    
Total environmental reserves at June 30, 2021 502.2   502.2    
Environmental reserves, current 88.9   88.9    
Environmental reserves, long-term 413.3   413.3    
Total environmental reserves at June 30, 2021 $ 502.2   $ 502.2   $ 564.4