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Environmental Obligations (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Dec. 31, 2018
Accrual for Environmental Loss Contingencies [Roll Forward]        
Environmental reserves, long-term     $ 435.5 $ 458.5
Environmental loss contingencies, net of expected recoveries, in excess of accrual $ 190.0      
Recorded Recoveries [Roll Forward]        
Environmental charges, net 2.6 $ 2.5    
Environmental provision, net 2.4 6.2    
Continuing Operations        
Recorded Recoveries [Roll Forward]        
Environmental charges, net 2.6 2.5    
Discontinued Operations        
Recorded Recoveries [Roll Forward]        
Environmental charges, net (0.2) 3.7    
Other Assets Including Long-term Receivables, Net        
Recorded Recoveries [Roll Forward]        
Environmental Recoveries, beginning 30.5      
Increase in recoveries 0.1      
Cash received 0.0      
Environmental Recoveries, ending 30.6      
Other Liabilities        
Recorded Recoveries [Roll Forward]        
Environmental remediation provision, net 2.5 6.2    
Other Assets        
Recorded Recoveries [Roll Forward]        
Environmental remediation provision, net (0.1) $ 0.0    
Gross        
Accrual for Environmental Loss Contingencies [Roll Forward]        
Total environmental reserves at December 31, 2018 529.4      
Provision (Benefit) 2.5      
(Spending) Recoveries (8.3)      
Foreign currency translation adjustments (0.7)      
Net change (6.5)      
Total environmental reserves at March 31, 2019 522.9      
Environmental reserves, current     80.6  
Environmental reserves, long-term     442.3  
Total environmental reserves, net of recoveries at end of period 529.4   522.9 529.4
Recoveries        
Accrual for Environmental Loss Contingencies [Roll Forward]        
Total environmental reserves at December 31, 2018 7.9      
Net change 0.0      
Total environmental reserves at March 31, 2019 7.9      
Environmental reserves, current     1.1  
Environmental reserves, long-term     6.8  
Total environmental reserves, net of recoveries at end of period 7.9   7.9 7.9
Net        
Accrual for Environmental Loss Contingencies [Roll Forward]        
Total environmental reserves at December 31, 2018 521.5      
Provision (Benefit) 2.5      
(Spending) Recoveries (8.3)      
Foreign currency translation adjustments (0.7)      
Net change (6.5)      
Total environmental reserves at March 31, 2019 515.0      
Environmental reserves, current     79.5  
Environmental reserves, long-term     435.5  
Total environmental reserves, net of recoveries at end of period $ 521.5   $ 515.0 $ 521.5