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Property, Plant, and Equipment (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant, and Equipment      
Gross property, plant and equipment $ 4,002.8 $ 3,899.6  
Less: Accumulated depreciation 1,431.0 1,227.5  
Total Property, plant and equipment, net 2,571.8 2,672.1  
Capitalized interest 1.1 5.4 $ 3.7
Original carrying value of assets under capital lease obligations 24.8 24.8  
Land and improvements      
Property, Plant, and Equipment      
Gross property, plant and equipment 47.4 46.5  
Buildings      
Property, Plant, and Equipment      
Gross property, plant and equipment 83.3 64.8  
Machinery and equipment      
Property, Plant, and Equipment      
Gross property, plant and equipment 3,733.8 3,656.5  
Automotive equipment      
Property, Plant, and Equipment      
Gross property, plant and equipment 24.7 24.7  
Furniture and fixtures      
Property, Plant, and Equipment      
Gross property, plant and equipment 32.4 28.9  
Leasehold improvements      
Property, Plant, and Equipment      
Gross property, plant and equipment 4.6 3.6  
Aircraft      
Property, Plant, and Equipment      
Gross property, plant and equipment 3.6 3.6  
Railcars      
Property, Plant, and Equipment      
Gross property, plant and equipment 16.8 16.8  
Construction in progress      
Property, Plant, and Equipment      
Gross property, plant and equipment $ 56.2 $ 54.2