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Property, Plant and Equipment (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Mar. 31, 2014
Property, plant and equipment [Abstract]    
Gross property, plant and equipment $ 1,021.2us-gaap_PropertyPlantAndEquipmentGross $ 1,078.6us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation (684.4)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (719.0)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Net property, plant and equipment $ 336.8us-gaap_PropertyPlantAndEquipmentNet $ 359.6us-gaap_PropertyPlantAndEquipmentNet