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Property, Plant and Equipment (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Property, Plant, and Equipment      
Total property, plant and equipment, gross $ 3,922.2   $ 3,899.6
Accumulated depreciation 1,280.0   1,227.5
Total property, plant and equipment, net 2,642.2   2,672.1
Capitalized interest 0.3 $ 1.5  
Original carrying value of assets under capital lease obligations 24.8   24.8
Land and improvements      
Property, Plant, and Equipment      
Total property, plant and equipment, gross 46.5   46.5
Buildings      
Property, Plant, and Equipment      
Total property, plant and equipment, gross 80.9   64.8
Machinery and equipment      
Property, Plant, and Equipment      
Total property, plant and equipment, gross 3,652.5   3,656.5
Automotive equipment      
Property, Plant, and Equipment      
Total property, plant and equipment, gross 24.7   24.7
Furniture and fixtures      
Property, Plant, and Equipment      
Total property, plant and equipment, gross 29.8   28.9
Leasehold improvements      
Property, Plant, and Equipment      
Total property, plant and equipment, gross 4.7   3.6
Aircraft      
Property, Plant, and Equipment      
Total property, plant and equipment, gross 3.6   3.6
Railcars      
Property, Plant, and Equipment      
Total property, plant and equipment, gross 16.8   16.8
Construction in progress      
Property, Plant, and Equipment      
Total property, plant and equipment, gross $ 62.7   $ 54.2