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Environmental Obligations Recoveries and Reserves (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Recorded Recoveries [Roll Forward]        
Expected recoveries recorded, beginning $ 46.2 $ 38.6    
Increase (Decrease) in Recoveries (2.9) 18.4    
Cash Received (4.9) (10.8)    
Expected recoveries recorded, ending 38.4 46.2 $ 38.6  
Transfer to environmental obligations (from) asset retirement obligations   2.6    
Accrual for Environmental Loss Contingencies, Balance Sheet Classification [Abstract]        
Environmental reserves, current, net of recoveries 63.0 71.6    
Environmental reserves, long-term continuing and discontinued, net of recoveries 458.5 340.2    
Total environmental reserves, net of recoveries 521.5 411.8 360.4 $ 334.3
Net Environmental Provisions [Abstract]        
Continuing operations 21.7 16.2 36.6  
Discontinued operations 153.9 76.1 36.9  
Net environmental provision 175.6 92.3 73.5  
Net Environmental Provisions, Assets and Liabilities [Abstract]        
Environmental reserves 178.2 105.6 80.8  
Other assets (2.6) (13.3) (7.3)  
Net environmental provision 175.6 92.3 73.5  
Environmental liabilities, continuing and discontinued        
Recorded Recoveries [Roll Forward]        
Expected recoveries recorded, beginning 13.9 11.4    
Increase (Decrease) in Recoveries (5.5) 2.5    
Cash Received (0.5) 0.0    
Expected recoveries recorded, ending 7.9 13.9 11.4  
Other assets        
Recorded Recoveries [Roll Forward]        
Expected recoveries recorded, beginning 32.3 27.2    
Increase (Decrease) in Recoveries 2.6 15.9    
Cash Received (4.4) (10.8)    
Expected recoveries recorded, ending $ 30.5 $ 32.3 $ 27.2