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Property, Plant, and Equipment (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Property, Plant, and Equipment      
Gross property, plant and equipment $ 2,606.3 $ 2,384.0  
Accumulated depreciation 741.9 601.1  
Property, plant, and equipment, net of accumulated depreciation 1,864.4 1,782.9  
Capitalized interest 3.6 10.8 3.9
Original carrying value of assets under capital lease obligations 24.8 25.1  
Land and improvements
      
Property, Plant, and Equipment      
Gross property, plant and equipment 36.1 31.0  
Buildings
      
Property, Plant, and Equipment      
Gross property, plant and equipment 42.6 40.6  
Machinery and equipment
      
Property, Plant, and Equipment      
Gross property, plant and equipment 2,312.5 2,089.5  
Automotive equipment
      
Property, Plant, and Equipment      
Gross property, plant and equipment 19.2 15.0  
Furniture and fixtures
      
Property, Plant, and Equipment      
Gross property, plant and equipment 18.3 13.7  
Leasehold improvements
      
Property, Plant, and Equipment      
Gross property, plant and equipment 2.5 2.5  
Aircraft
      
Property, Plant, and Equipment      
Gross property, plant and equipment 2.3 0  
Railcars
      
Property, Plant, and Equipment      
Gross property, plant and equipment 7.9 2.5  
Construction in progress
      
Property, Plant, and Equipment      
Gross property, plant and equipment $ 164.9 $ 189.2