Property, Plant and Equipment (Details) - USD ($) $ in Millions	Dec. 31, 2016	Mar. 31, 2016
Property, plant and equipment [Abstract]
Gross property, plant and equipment	$ 1,149.4	$ 1,043.6
Accumulated depreciation	(703.2)	(705.0)
Net property, plant and equipment	$ 446.2	$ 338.6