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Property, Plant, and Equipment (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Property, Plant, and Equipment    
Gross property, plant and equipment $ 2,758.6 $ 2,606.3
Accumulated depreciation 849.0 741.9
Total property, plant and equipment, net 1,909.6 1,864.4
Land and improvements
    
Property, Plant, and Equipment    
Gross property, plant and equipment 37.2 36.1
Buildings
    
Property, Plant, and Equipment    
Gross property, plant and equipment 44.9 42.6
Machinery and equipment
    
Property, Plant, and Equipment    
Gross property, plant and equipment 2,410.3 2,312.5
Automotive equipment
    
Property, Plant, and Equipment    
Gross property, plant and equipment 20.6 19.2
Furniture and fixtures
    
Property, Plant, and Equipment    
Gross property, plant and equipment 20.0 18.3
Leasehold improvements
    
Property, Plant, and Equipment    
Gross property, plant and equipment 3.4 2.5
Aircraft
    
Property, Plant, and Equipment    
Gross property, plant and equipment 2.3 2.3
Railcars
    
Property, Plant, and Equipment    
Gross property, plant and equipment 7.9 7.9
Construction in progress
    
Property, Plant, and Equipment    
Gross property, plant and equipment $ 212.0 $ 164.9