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Environmental Obligations - Environmental Reserve Rollforward and Recoveries and Reserves (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Accrual for Environmental Loss Contingencies [Roll Forward]      
Environmental reserves, long-term $ 393.6   $ 415.9
Recorded Recoveries [Roll Forward]      
Environmental charges, net (3.3) $ (4.1)  
Environmental provision, net (0.6) (1.0)  
Continuing Operations      
Recorded Recoveries [Roll Forward]      
Environmental charges, net (3.3) (4.1)  
Discontinued Operations      
Recorded Recoveries [Roll Forward]      
Environmental charges, net 2.7 3.1  
Other Assets Including Long-term Receivables, Net      
Recorded Recoveries [Roll Forward]      
Environmental recoveries, beginning 4.5    
Increase (Decrease) in recoveries 0.1    
Cash received 0.0    
Environmental recoveries, ending 4.6    
Other Liabilities      
Recorded Recoveries [Roll Forward]      
Environmental remediation provision, net (0.5) (0.9)  
Other Assets      
Recorded Recoveries [Roll Forward]      
Environmental remediation provision, net (0.1) $ (0.1)  
Gross      
Accrual for Environmental Loss Contingencies [Roll Forward]      
Total environmental reserves at December 31, 2021 514.6    
Provision (Benefit) (0.1)    
(Spending) Recoveries (7.9)    
Foreign currency translation adjustments (2.0)    
Net change (10.0)    
Total environmental reserves at March 31, 2022 504.6    
Environmental reserves, current 100.1    
Environmental reserves, long-term 404.5    
Total environmental reserves at March 31, 2022 504.6   514.6
Recoveries      
Accrual for Environmental Loss Contingencies [Roll Forward]      
Total environmental reserves at December 31, 2021 11.4    
Provision (Benefit) (0.4)    
(Spending) Recoveries 0.0    
Foreign currency translation adjustments 0.0    
Net change (0.4)    
Total environmental reserves at March 31, 2022 11.8    
Environmental reserves, current 0.9    
Environmental reserves, long-term 10.9    
Total environmental reserves at March 31, 2022 11.8   11.4
Net      
Accrual for Environmental Loss Contingencies [Roll Forward]      
Total environmental reserves at December 31, 2021 503.2    
Provision (Benefit) (0.5)    
(Spending) Recoveries (7.9)    
Foreign currency translation adjustments (2.0)    
Net change (10.4)    
Total environmental reserves at March 31, 2022 492.8    
Environmental reserves, current 99.2    
Environmental reserves, long-term 393.6    
Total environmental reserves at March 31, 2022 $ 492.8   $ 503.2