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Environmental Obligations (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Dec. 31, 2019
Accrual for Environmental Loss Contingencies [Roll Forward]                
Environmental reserves, long-term             $ 424.4 $ 470.5
Environmental loss contingencies, net of expected recoveries, in excess of accrual         $ 160.0      
Recorded Recoveries [Roll Forward]                
Payment to FMC       $ 20.0        
Environmental charges, net   $ 4.0 $ 4.1   13.7 $ 12.3    
Environmental provision, net   14.9 12.1   30.3 24.0    
Air Deposition Area #2                
Accrual for Environmental Loss Contingencies [Roll Forward]                
Provision (Benefit) $ 6.6              
Continuing Operations                
Recorded Recoveries [Roll Forward]                
Environmental charges, net   4.0 4.1   13.7 12.3    
Discontinued Operations                
Recorded Recoveries [Roll Forward]                
Environmental charges, net   10.9 8.0   16.6 11.7    
Other Assets Including Long-term Receivables, Net                
Recorded Recoveries [Roll Forward]                
Environmental Recoveries, beginning       27.3 27.3      
Increase (Decrease) in recoveries         (2.4)      
Cash received         (20.4)      
Environmental Recoveries, ending 4.5 4.5     4.5      
Other Liabilities                
Recorded Recoveries [Roll Forward]                
Environmental remediation provision, net   15.9 12.0   27.9 24.5    
Other Assets                
Recorded Recoveries [Roll Forward]                
Environmental remediation provision, net   (1.0) $ 0.1   2.4 $ (0.5)    
Gross                
Accrual for Environmental Loss Contingencies [Roll Forward]                
Total environmental reserves at December 31, 2019       595.8 595.8      
Provision (Benefit)         28.8      
(Spending) Recoveries         (57.7)      
Foreign currency translation adjustments         3.0      
Net change         (25.9)      
Total environmental reserves at September 30, 2020 569.9 569.9     569.9      
Environmental reserves, current             136.7  
Environmental reserves, long-term             433.2  
Total environmental reserves at September 30, 2020 569.9 569.9   595.8 569.9   569.9 595.8
Recoveries                
Accrual for Environmental Loss Contingencies [Roll Forward]                
Total environmental reserves at December 31, 2019       10.0 10.0      
Provision (Benefit)         (0.9)      
(Spending) Recoveries         0.6      
Net change         (0.3)      
Total environmental reserves at September 30, 2020 10.3 10.3     10.3      
Environmental reserves, current             1.5  
Environmental reserves, long-term             8.8  
Total environmental reserves at September 30, 2020 10.3 10.3   10.0 10.3   10.3 10.0
Net                
Accrual for Environmental Loss Contingencies [Roll Forward]                
Total environmental reserves at December 31, 2019       585.8 585.8      
Provision (Benefit)         27.9      
(Spending) Recoveries         (57.1)      
Foreign currency translation adjustments         3.0      
Net change         (26.2)      
Total environmental reserves at September 30, 2020 559.6 559.6     559.6      
Environmental reserves, current             135.2  
Environmental reserves, long-term             424.4  
Total environmental reserves at September 30, 2020 $ 559.6 $ 559.6   $ 585.8 $ 559.6   $ 559.6 $ 585.8