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Summary of Properties and Equipment (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Abstract]    
Land $ 0.3us-gaap_Land $ 0.3us-gaap_Land
Buildings and improvements 29.1us-gaap_BuildingsAndImprovementsGross 27.0us-gaap_BuildingsAndImprovementsGross
Machinery and equipment 164.7us-gaap_MachineryAndEquipmentGross 158.2us-gaap_MachineryAndEquipmentGross
Total property and equipment, at cost 194.1us-gaap_PropertyPlantAndEquipmentGross 185.5us-gaap_PropertyPlantAndEquipmentGross
Less: Accumulated depreciation 124.6us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 121.7us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Properties and equipment, net $ 69.5us-gaap_PropertyPlantAndEquipmentNet $ 63.8us-gaap_PropertyPlantAndEquipmentNet