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Environmental Obligations - Environmental Reserve Rollforward and Recoveries and Reserves (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Accrual for Environmental Loss Contingencies [Roll Forward]      
Environmental reserves, long-term $ 426.1   $ 439.1
Recorded Recoveries [Roll Forward]      
Environmental charges, net 2.3 $ (3.3)  
Environmental provision, net 5.0 (0.6)  
Continuing Operations      
Recorded Recoveries [Roll Forward]      
Environmental charges, net 2.3 (3.3)  
Discontinued Operations      
Recorded Recoveries [Roll Forward]      
Environmental charges, net 2.7 2.7  
Other Assets Including Long-term Receivables, Net      
Recorded Recoveries [Roll Forward]      
Environmental recoveries, beginning 6.4    
Increase (Decrease) in recoveries 0.3    
Cash received (1.0)    
Environmental recoveries, ending 5.7    
Other Liabilities      
Recorded Recoveries [Roll Forward]      
Environmental remediation provision, net 5.3 (0.5)  
Other Assets      
Recorded Recoveries [Roll Forward]      
Environmental remediation provision, net (0.3) $ (0.1)  
Gross      
Accrual for Environmental Loss Contingencies [Roll Forward]      
Total environmental reserves at December 31, 2022 543.1    
Provision (Benefit) 5.5    
(Spending) Recoveries (13.0)    
Foreign currency translation adjustments 1.0    
Net change (6.5)    
Total environmental reserves at March 31, 2023 536.6    
Environmental reserves, current 97.5    
Environmental reserves, long-term 439.1    
Total environmental reserves at March 31, 2023 536.6   543.1
Recoveries      
Accrual for Environmental Loss Contingencies [Roll Forward]      
Total environmental reserves at December 31, 2022 13.9    
Provision (Benefit) (0.2)    
(Spending) Recoveries 0.0    
Foreign currency translation adjustments 0.0    
Net change (0.2)    
Total environmental reserves at March 31, 2023 14.1    
Environmental reserves, current 1.1    
Environmental reserves, long-term 13.0    
Total environmental reserves at March 31, 2023 14.1   13.9
Net      
Accrual for Environmental Loss Contingencies [Roll Forward]      
Total environmental reserves at December 31, 2022 529.2    
Provision (Benefit) 5.3    
(Spending) Recoveries (13.0)    
Foreign currency translation adjustments 1.0    
Net change (6.7)    
Total environmental reserves at March 31, 2023 522.5    
Environmental reserves, current 96.4    
Environmental reserves, long-term 426.1    
Total environmental reserves at March 31, 2023 $ 522.5   $ 529.2