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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Accrual for Environmental Loss Contingencies [Roll Forward]          
Environmental reserves, long-term $ 373.4   $ 373.4   $ 415.9
Recorded Recoveries [Roll Forward]          
Environmental charges, net 0.9 $ 3.7 (2.4) $ (0.4)  
Environmental provision, net 1.8 7.9 1.2 6.9  
Continuing Operations          
Recorded Recoveries [Roll Forward]          
Environmental charges, net 0.9 3.7 (2.4) (0.4)  
Discontinued Operations          
Recorded Recoveries [Roll Forward]          
Environmental charges, net 0.9 4.2 3.6 7.3  
Other Assets Including Long-term Receivables, Net          
Recorded Recoveries [Roll Forward]          
Environmental recoveries, beginning     4.5    
Increase (Decrease) in recoveries     1.9    
Cash received     (0.3)    
Environmental recoveries, ending 6.1   6.1    
Other Liabilities          
Recorded Recoveries [Roll Forward]          
Environmental remediation provision, net 3.7 8.4 3.1 7.5  
Other Assets          
Recorded Recoveries [Roll Forward]          
Environmental remediation provision, net (1.9) $ (0.5) (1.9) $ (0.6)  
Gross          
Accrual for Environmental Loss Contingencies [Roll Forward]          
Total environmental reserves at December 31, 2021     514.6    
Provision (Benefit)     3.7    
(Spending) Recoveries     (25.8)    
Foreign currency translation adjustments     (6.0)    
Net change     (28.1)    
Total environmental reserves at June 30, 2022 486.5   486.5    
Environmental reserves, current 102.2   102.2    
Environmental reserves, long-term 384.3   384.3    
Total environmental reserves at June 30, 2022 486.5   486.5   514.6
Recoveries          
Accrual for Environmental Loss Contingencies [Roll Forward]          
Total environmental reserves at December 31, 2021     11.4    
Provision (Benefit)     (0.6)    
(Spending) Recoveries     0.0    
Foreign currency translation adjustments     0.0    
Net change     (0.6)    
Total environmental reserves at June 30, 2022 12.0   12.0    
Environmental reserves, current 1.1   1.1    
Environmental reserves, long-term 10.9   10.9    
Total environmental reserves at June 30, 2022 12.0   12.0   11.4
Net          
Accrual for Environmental Loss Contingencies [Roll Forward]          
Total environmental reserves at December 31, 2021     503.2    
Provision (Benefit)     3.1    
(Spending) Recoveries     (25.8)    
Foreign currency translation adjustments     (6.0)    
Net change     (28.7)    
Total environmental reserves at June 30, 2022 474.5   474.5    
Environmental reserves, current 101.1   101.1    
Environmental reserves, long-term 373.4   373.4    
Total environmental reserves at June 30, 2022 $ 474.5   $ 474.5   $ 503.2