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Environmental Obligations - Environmental Reserve Rollforward and Recoveries and Reserves (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Accrual for Environmental Loss Contingencies [Roll Forward]      
Environmental reserves, long-term $ 477.9   $ 494.7
Recorded Recoveries [Roll Forward]      
Environmental charges, net 3.3 $ 2.3  
Environmental provision, net 5.5 5.0  
Continuing Operations      
Recorded Recoveries [Roll Forward]      
Environmental charges, net 3.3 2.3  
Discontinued Operations      
Recorded Recoveries [Roll Forward]      
Environmental charges, net 2.2 2.7  
Environmental recoveries      
Recorded Recoveries [Roll Forward]      
Environmental recoveries, beginning 4.9    
Increase (Decrease) in recoveries 0.1    
Cash received (0.4)    
Environmental recoveries, ending 4.6    
Environmental provisions, net - recorded to liabilities      
Recorded Recoveries [Roll Forward]      
Environmental provision, net 5.9 5.3  
Environmental provisions, net - recorded to assets      
Recorded Recoveries [Roll Forward]      
Environmental provision, net (0.4) $ (0.3)  
Gross      
Accrual for Environmental Loss Contingencies [Roll Forward]      
Total environmental reserves at December 31, 2023 601.8    
Provision (Benefit) 6.1    
(Spending) Recoveries (21.4)    
Foreign currency translation adjustments (2.7)    
Net change (18.0)    
Total environmental reserves at March 31, 2024 583.8    
Environmental reserves, current 97.2    
Environmental reserves, long-term 486.6    
Total environmental reserves at March 31, 2024 583.8   601.8
Recoveries      
Accrual for Environmental Loss Contingencies [Roll Forward]      
Total environmental reserves at December 31, 2023 9.7    
Provision (Benefit) (0.2)    
(Spending) Recoveries 0.1    
Foreign currency translation adjustments 0.0    
Net change (0.1)    
Total environmental reserves at March 31, 2024 9.8    
Environmental reserves, current 1.1    
Environmental reserves, long-term 8.7    
Total environmental reserves at March 31, 2024 9.8   9.7
Net      
Accrual for Environmental Loss Contingencies [Roll Forward]      
Total environmental reserves at December 31, 2023 592.1    
Provision (Benefit) 5.9    
(Spending) Recoveries (21.3)    
Foreign currency translation adjustments (2.7)    
Net change (18.1)    
Total environmental reserves at March 31, 2024 574.0    
Environmental reserves, current 96.1    
Environmental reserves, long-term 477.9    
Total environmental reserves at March 31, 2024 $ 574.0   $ 592.1