Segment and Geographic Information, Net sales by End Market (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Revenue from External Customer [Line Items]
Net sales	$ 2,103.1	$ 1,503.0	$ 1,352.5
Automotive [Member]
Revenue from External Customer [Line Items]
Net sales	526.0	461.0	396.8
Commercial Vehicle [Member]
Revenue from External Customer [Line Items]
Net sales	381.7	382.5	459.8
Off-Highway [Member]
Revenue from External Customer [Line Items]
Net sales	271.2	202.8	206.2
Other Vehicular [Member]
Revenue from External Customer [Line Items]
Net sales	61.9	55.8	57.6
Commercial & Residential Air Conditioning [Member]
Revenue from External Customer [Line Items]
Net sales	371.3	136.5	48.8
Commercial Refrigeration [Member]
Revenue from External Customer [Line Items]
Net sales	158.7	52.2	0.0
Other HVAC&R [Member]
Revenue from External Customer [Line Items]
Net sales	$ 332.3	$ 212.2	$ 183.3