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Environmental Obligations (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Dec. 31, 2017
Accrual for Environmental Loss Contingencies [Roll Forward]        
Environmental reserves, long-term     $ 337.0 $ 346.2
Environmental loss contingencies, net of expected recoveries, in excess of accrual $ 200.0      
Recorded Recoveries [Roll Forward]        
Environmental charges, net 2.6 $ 2.3    
Environmental provision, net 6.3 6.1    
Continuing Operations        
Recorded Recoveries [Roll Forward]        
Environmental charges, net 2.6 3.8    
Discontinued Operations        
Recorded Recoveries [Roll Forward]        
Environmental charges, net 3.7 2.3    
Other Assets Including Long-term Receivables, Net        
Recorded Recoveries [Roll Forward]        
Environmental Recoveries, beginning 32.3      
Increase in recoveries 0.0      
Cash received (0.8)      
Environmental Recoveries, ending 31.5      
Other Liabilities        
Recorded Recoveries [Roll Forward]        
Environmental remediation provision, net 6.3 6.1    
Other Assets        
Recorded Recoveries [Roll Forward]        
Environmental remediation provision, net 0.0 $ 0.0    
Gross        
Accrual for Environmental Loss Contingencies [Roll Forward]        
Total environmental reserves at December 31, 2017 432.1      
Provision (Benefit) 6.3      
(Spending) Recoveries (6.5)      
Foreign currency translation adjustments 2.4      
Net change 2.2      
Total environmental reserves at March 31, 2018 434.3      
Environmental reserves, current     85.0  
Environmental reserves, long-term     349.3  
Total environmental reserves, net of recoveries at end of period 432.1   434.3 432.1
Recoveries        
Accrual for Environmental Loss Contingencies [Roll Forward]        
Total environmental reserves at December 31, 2017 13.9      
Provision (Benefit) 0.0      
(Spending) Recoveries 0.0      
Foreign currency translation adjustments 0.0      
Net change 0.0      
Total environmental reserves at March 31, 2018 13.9      
Environmental reserves, current     1.6  
Environmental reserves, long-term     12.3  
Total environmental reserves, net of recoveries at end of period 13.9   13.9 13.9
Net        
Accrual for Environmental Loss Contingencies [Roll Forward]        
Total environmental reserves at December 31, 2017 418.2      
Provision (Benefit) 6.3      
(Spending) Recoveries (6.5)      
Foreign currency translation adjustments 2.4      
Net change 2.2      
Total environmental reserves at March 31, 2018 420.4      
Environmental reserves, current     83.4  
Environmental reserves, long-term     337.0  
Total environmental reserves, net of recoveries at end of period $ 418.2   $ 420.4 $ 418.2