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Property, Plant and Equipment (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Property, Plant, and Equipment          
Total property, plant and equipment, gross $ 3,951.7   $ 3,951.7   $ 3,899.6
Accumulated depreciation 1,330.5   1,330.5   1,227.5
Total property, plant and equipment, net 2,621.2   2,621.2   2,672.1
Capitalized interest 0.2 $ 1.9 0.5 $ 3.4  
Original carrying value of assets under capital lease obligations 24.8   24.8   24.8
Land and improvements          
Property, Plant, and Equipment          
Total property, plant and equipment, gross 46.5   46.5   46.5
Buildings          
Property, Plant, and Equipment          
Total property, plant and equipment, gross 80.9   80.9   64.8
Machinery and equipment          
Property, Plant, and Equipment          
Total property, plant and equipment, gross 3,676.7   3,676.7   3,656.5
Automotive equipment          
Property, Plant, and Equipment          
Total property, plant and equipment, gross 25.8   25.8   24.7
Furniture and fixtures          
Property, Plant, and Equipment          
Total property, plant and equipment, gross 29.8   29.8   28.9
Leasehold improvements          
Property, Plant, and Equipment          
Total property, plant and equipment, gross 4.8   4.8   3.6
Aircraft          
Property, Plant, and Equipment          
Total property, plant and equipment, gross 3.6   3.6   3.6
Railcars          
Property, Plant, and Equipment          
Total property, plant and equipment, gross 16.8   16.8   16.8
Construction in progress          
Property, Plant, and Equipment          
Total property, plant and equipment, gross $ 66.8   $ 66.8   $ 54.2