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Property, Plant, and Equipment (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Property, Plant, and Equipment
Gross property, plant and equipment	$ 2,839.6us-gaap_PropertyPlantAndEquipmentGross		$ 2,803.2us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation	928.0us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment		887.2us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Total property, plant and equipment, net	1,911.6us-gaap_PropertyPlantAndEquipmentNet		1,916.0us-gaap_PropertyPlantAndEquipmentNet
Capitalized interest	0.4us-gaap_InterestPaidCapitalized	2.3us-gaap_InterestPaidCapitalized
Original carrying value of assets under capital lease obligations	24.8us-gaap_CapitalLeasedAssetsGross		24.8us-gaap_CapitalLeasedAssetsGross
Land and improvements
Property, Plant, and Equipment
Gross property, plant and equipment	37.7us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandAndLandImprovementsMember		37.4us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandAndLandImprovementsMember
Buildings
Property, Plant, and Equipment
Gross property, plant and equipment	51.4us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingMember		50.4us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingMember
Machinery and equipment
Property, Plant, and Equipment
Gross property, plant and equipment	2,606.7us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MachineryAndEquipmentMember		2,581.2us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MachineryAndEquipmentMember
Automotive equipment
Property, Plant, and Equipment
Gross property, plant and equipment	22.5us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_TransportationEquipmentMember		22.1us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_TransportationEquipmentMember
Furniture and fixtures
Property, Plant, and Equipment
Gross property, plant and equipment	19.1us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember		19.0us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember
Leasehold improvements
Property, Plant, and Equipment
Gross property, plant and equipment	3.4us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember		3.4us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember
Aircraft
Property, Plant, and Equipment
Gross property, plant and equipment	3.7us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_AirTransportationEquipmentMember		3.7us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_AirTransportationEquipmentMember
Railcars
Property, Plant, and Equipment
Gross property, plant and equipment	14.5us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_RailroadTransportationEquipmentMember		14.5us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_RailroadTransportationEquipmentMember
Construction in progress
Property, Plant, and Equipment
Gross property, plant and equipment	$ 80.6us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember		$ 71.5us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

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-Publisher SEC

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- Definition

Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Topic 360

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-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229



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