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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, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Accrual for Environmental Loss Contingencies [Roll Forward]          
Environmental reserves, long-term $ 522.9   $ 522.9   $ 521.3
Recorded Recoveries [Roll Forward]          
Environmental recoveries, beginning     3.8    
Increase (Decrease) in recoveries     0.3    
Cash received     (0.4)    
Environmental recoveries, ending 3.7   3.7    
Environmental charges, net 7.4 $ 5.7 10.9 $ 9.0  
Environmental provision, net 11.5 9.1 17.5 14.6  
Continuing Operations          
Recorded Recoveries [Roll Forward]          
Environmental charges, net 7.4 5.7 10.9 9.0  
Discontinued Operations          
Recorded Recoveries [Roll Forward]          
Environmental charges, net 4.1 3.4 6.6 5.6  
Environmental provisions, net - recorded to assets          
Recorded Recoveries [Roll Forward]          
Environmental provision, net (0.2) 0.1 (0.3) (0.3)  
Environmental provisions, net - recorded to liabilities          
Recorded Recoveries [Roll Forward]          
Environmental provision, net 11.7 $ 9.0 17.8 $ 14.9  
Gross          
Accrual for Environmental Loss Contingencies [Roll Forward]          
Total environmental reserves at December 31, 2024     623.2    
Provision (Benefit)     18.3    
(Spending) Recoveries     (32.0)    
Foreign currency translation adjustments     14.3    
Net change     0.6    
Total environmental reserves at June 30, 2025 623.8   623.8    
Environmental reserves, current 92.9   92.9    
Environmental reserves, long-term 530.9   530.9    
Total environmental reserves at June 30, 2025 623.8   623.8   623.2
Recoveries          
Accrual for Environmental Loss Contingencies [Roll Forward]          
Total environmental reserves at December 31, 2024     10.1    
Provision (Benefit)     (0.7)    
(Spending) Recoveries     1.6    
Foreign currency translation adjustments     0.0    
Net change     0.9    
Total environmental reserves at June 30, 2025 9.2   9.2    
Environmental reserves, current 1.2   1.2    
Environmental reserves, long-term 8.0   8.0    
Total environmental reserves at June 30, 2025 9.2   9.2   10.1
Net          
Accrual for Environmental Loss Contingencies [Roll Forward]          
Total environmental reserves at December 31, 2024     613.1    
Provision (Benefit)     17.6    
(Spending) Recoveries     (30.4)    
Foreign currency translation adjustments     14.3    
Net change     1.5    
Total environmental reserves at June 30, 2025 614.6   614.6    
Environmental reserves, current 91.7   91.7    
Environmental reserves, long-term 522.9   522.9    
Total environmental reserves at June 30, 2025 $ 614.6   $ 614.6   $ 613.1