Property, Plant and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 1,177.6	$ 1,043.6
Less: accumulated depreciation	(718.6)	(705.0)
Net property, plant and equipment	459.0	338.6
Depreciation expense	54.2	48.6	$ 50.0
Loss from disposition of property, plant and equipment	(0.4)	(0.4)	$ (1.1)
Land [Member]
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	18.9	7.2
Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 255.6	221.3
Buildings and Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, depreciable lives	10 years
Buildings and Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, depreciable lives	40 years
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 755.5	694.3
Machinery and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, depreciable lives	3 years
Machinery and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, depreciable lives	12 years
Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 92.5	84.1
Office Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, depreciable lives	3 years
Office Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, depreciable lives	10 years
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 55.1	$ 36.7