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Environmental Obligations (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Dec. 31, 2019
Accrual for Environmental Loss Contingencies [Roll Forward]              
Environmental reserves, long-term           $ (431.8) $ (470.5)
Environmental loss contingencies, net of expected recoveries, in excess of accrual       $ 150.0      
Recorded Recoveries [Roll Forward]              
Payment to FMC   $ 20.0          
Environmental charges, net $ 3.3   $ 5.6 9.7 $ 8.2    
Environmental provision, net 6.6   9.5 15.4 11.9    
Continuing Operations              
Recorded Recoveries [Roll Forward]              
Environmental charges, net 3.3   5.6 9.7 8.2    
Discontinued Operations              
Recorded Recoveries [Roll Forward]              
Environmental charges, net 3.3   3.9 5.7 3.7    
Other Assets Including Long-term Receivables, Net              
Recorded Recoveries [Roll Forward]              
Environmental Recoveries, beginning   27.3   27.3      
Increase (Decrease) in recoveries       (3.3)      
Cash received       (20.3)      
Environmental Recoveries, ending 3.7     3.7      
Other Liabilities              
Recorded Recoveries [Roll Forward]              
Environmental remediation provision, net 6.7   10.0 12.0 12.5    
Other Assets              
Recorded Recoveries [Roll Forward]              
Environmental remediation provision, net (0.1)   $ (0.5) 3.4 $ (0.6)    
Gross              
Accrual for Environmental Loss Contingencies [Roll Forward]              
Total environmental reserves at December 31, 2019   595.8   595.8      
Provision (Benefit)       12.6      
(Spending) Recoveries       (40.1)      
Foreign currency translation adjustments       0.5      
Net change       (27.0)      
Total environmental reserves at June 30, 2020 568.8     568.8      
Environmental reserves, current           (128.4)  
Environmental reserves, long-term           (440.4)  
Accrual for Environmental Loss Contingencies 568.8 595.8   568.8   568.8 595.8
Recoveries              
Accrual for Environmental Loss Contingencies [Roll Forward]              
Total environmental reserves at December 31, 2019   10.0   10.0      
Provision (Benefit)       (0.6)      
(Spending) Recoveries       0.6      
Net change       0.0      
Total environmental reserves at June 30, 2020 10.0     10.0      
Environmental reserves, current           (1.4)  
Environmental reserves, long-term           (8.6)  
Accrual for Environmental Loss Contingencies 10.0 10.0   10.0   10.0 10.0
Net              
Accrual for Environmental Loss Contingencies [Roll Forward]              
Total environmental reserves at December 31, 2019   585.8   585.8      
Provision (Benefit)       12.0      
(Spending) Recoveries       (39.5)      
Foreign currency translation adjustments       0.5      
Net change       (27.0)      
Total environmental reserves at June 30, 2020 558.8     558.8      
Environmental reserves, current           (127.0)  
Environmental reserves, long-term           (431.8)  
Accrual for Environmental Loss Contingencies $ 558.8 $ 585.8   $ 558.8   $ 558.8 $ 585.8