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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross $ 187.0us-gaap_PropertyPlantAndEquipmentGross $ 175.1us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation (106.2)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (114.7)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property, plant and equipment, Net 80.8us-gaap_PropertyPlantAndEquipmentNet 60.4us-gaap_PropertyPlantAndEquipmentNet
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 8.8us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
7.5us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
Buildings [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 20.7us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
10.8us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 151.8us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember
152.9us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember
Work in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross $ 5.7us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
$ 3.9us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember