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Property, Plant and Equipment (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Property, Plant, and Equipment      
Gross property, plant and equipment $ 3,050.9   $ 3,007.1
Accumulated depreciation 1,078.5   1,040.0
Total property, plant and equipment, net 1,972.4   1,967.1
Capitalized interest 1.5 $ 0.4  
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 38.8   38.6
Buildings      
Property, Plant, and Equipment      
Gross property, plant and equipment 53.1   53.6
Machinery and equipment      
Property, Plant, and Equipment      
Gross property, plant and equipment 2,739.5   2,723.0
Automotive equipment      
Property, Plant, and Equipment      
Gross property, plant and equipment 24.7   24.8
Furniture and fixtures      
Property, Plant, and Equipment      
Gross property, plant and equipment 21.3   21.3
Leasehold improvements      
Property, Plant, and Equipment      
Gross property, plant and equipment 3.4   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 16.3   16.3
Construction in progress      
Property, Plant, and Equipment      
Gross property, plant and equipment $ 150.2   $ 122.3