Property, Plant and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 1,302.2	$ 1,177.6
Less: accumulated depreciation	(797.9)	(718.6)
Net property, plant and equipment	504.3	459.0
Depreciation expense	67.0	54.2	$ 48.6
Loss from disposition of property, plant and equipment	(0.7)	(0.4)	$ (0.4)
Land [Member]
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	22.6	18.9
Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 295.6	255.6
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	$ 840.8	755.5
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	$ 93.0	92.5
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	$ 50.2	$ 55.1