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Environmental Obligations (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Dec. 31, 2018
Accrual for Environmental Loss Contingencies [Roll Forward]            
Environmental reserves, long-term         $ 424.0 $ 458.5
Environmental loss contingencies, net of expected recoveries, in excess of accrual     $ 190.0      
Recorded Recoveries [Roll Forward]            
Environmental charges, net $ 5.6 $ 4.1 8.2 $ 6.6    
Environmental provision, net 9.5 6.8 11.9 13.0    
Continuing Operations            
Recorded Recoveries [Roll Forward]            
Environmental charges, net 5.6 4.1 8.2 6.6    
Discontinued Operations            
Recorded Recoveries [Roll Forward]            
Environmental charges, net 3.9 2.7 3.7 6.4    
Other Assets Including Long-term Receivables, Net            
Recorded Recoveries [Roll Forward]            
Environmental Recoveries, beginning     30.5      
Increase in recoveries     0.6      
Cash received     (1.0)      
Environmental Recoveries, ending 30.1   30.1      
Other Liabilities            
Recorded Recoveries [Roll Forward]            
Environmental remediation provision, net 10.0 6.8 12.5 13.0    
Other Assets            
Recorded Recoveries [Roll Forward]            
Environmental remediation provision, net (0.5) $ 0.0 (0.6) $ 0.0    
Gross            
Accrual for Environmental Loss Contingencies [Roll Forward]            
Total environmental reserves at December 31, 2018     529.4      
Provision (Benefit)     12.5      
(Spending) Recoveries     (19.2)      
Net change     (6.7)      
Total environmental reserves at June 30, 2019 522.7   522.7      
Environmental reserves, current         91.9  
Environmental reserves, long-term         430.8  
Total environmental reserves, net of recoveries at end of period 522.7   529.4   522.7 529.4
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 June 30, 2019 7.9   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 7.9
Net            
Accrual for Environmental Loss Contingencies [Roll Forward]            
Total environmental reserves at December 31, 2018     521.5      
Provision (Benefit)     12.5      
(Spending) Recoveries     (19.2)      
Net change     (6.7)      
Total environmental reserves at June 30, 2019 514.8   514.8      
Environmental reserves, current         90.8  
Environmental reserves, long-term         424.0  
Total environmental reserves, net of recoveries at end of period $ 514.8   $ 521.5   $ 514.8 $ 521.5