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Summary of Significant Accounting Policies - Property, Plant and Equipment (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]      
Property, plant, and equipment, at cost $ 5,515.4us-gaap_PropertyPlantAndEquipmentGross $ 5,232.7us-gaap_PropertyPlantAndEquipmentGross  
Less accumulated depreciation (2,657.8)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (2,427.0)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment  
Property, plant, and equipment, net 2,857.6us-gaap_PropertyPlantAndEquipmentNet 2,805.7us-gaap_PropertyPlantAndEquipmentNet  
Depreciation [Abstract]      
Depreciation expense 348.2us-gaap_Depreciation 191.2us-gaap_Depreciation 166.0us-gaap_Depreciation
Incremental depreciation 42.0us-gaap_RestructuringReserveAcceleratedDepreciation    
Land and Land Improvements      
Property, Plant and Equipment [Line Items]      
Property, plant, and equipment, at cost 138.2us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandAndLandImprovementsMember
140.6us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandAndLandImprovementsMember
 
Buildings      
Property, Plant and Equipment [Line Items]      
Property, plant, and equipment, at cost 659.9us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
628.9us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
 
Machinery and Equipment      
Property, Plant and Equipment [Line Items]      
Property, plant, and equipment, at cost 4,508.0us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember
4,246.3us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember
 
Construction in Progress      
Property, Plant and Equipment [Line Items]      
Property, plant, and equipment, at cost 154.8us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
168.8us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
 
Other      
Property, Plant and Equipment [Line Items]      
Property, plant, and equipment, at cost $ 54.5us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OtherCapitalizedPropertyPlantAndEquipmentMember
$ 48.1us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OtherCapitalizedPropertyPlantAndEquipmentMember