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Property, Plant, and Equipment (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Property, Plant, and Equipment          
Gross property, plant and equipment $ 2,885.4   $ 2,885.4   $ 2,803.2
Accumulated depreciation 968.9   968.9   887.2
Total property, plant and equipment, net 1,916.5   1,916.5   1,916.0
Capitalized interest 0.8 $ 2.9 1.2 $ 5.2  
Original carrying value of assets under capital lease obligations 24.8   24.8   24.8
Land and improvements          
Property, Plant, and Equipment          
Gross property, plant and equipment 37.8   37.8   37.4
Buildings          
Property, Plant, and Equipment          
Gross property, plant and equipment 51.5   51.5   50.4
Machinery and equipment          
Property, Plant, and Equipment          
Gross property, plant and equipment 2,617.2   2,617.2   2,581.2
Automotive equipment          
Property, Plant, and Equipment          
Gross property, plant and equipment 23.4   23.4   22.1
Furniture and fixtures          
Property, Plant, and Equipment          
Gross property, plant and equipment 19.9   19.9   19.0
Leasehold improvements          
Property, Plant, and Equipment          
Gross property, plant and equipment 3.4   3.4   3.4
Aircraft          
Property, Plant, and Equipment          
Gross property, plant and equipment 3.6   3.6   3.7
Railcars          
Property, Plant, and Equipment          
Gross property, plant and equipment 14.9   14.9   14.5
Construction in progress          
Property, Plant, and Equipment          
Gross property, plant and equipment $ 113.7   $ 113.7   $ 71.5