Goodwill (Details) - USD ($) $ in Millions		12 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Goodwill [Roll Forward]
Beginning balance		$ 165.1	$ 15.8
Acquired goodwill	[1]	1.3	150.6
Effect of exchange rate changes		7.4	(1.3)
Ending balance		173.8	165.1
Asia [Member]
Goodwill [Roll Forward]
Beginning balance		0.5	0.5
Acquired goodwill	[1]	0.0	0.0
Effect of exchange rate changes		0.0	0.0
Ending balance		0.5	0.5
BHVAC [Member]
Goodwill [Roll Forward]
Beginning balance		13.7	15.3
Acquired goodwill	[1]	0.0	0.0
Effect of exchange rate changes		1.3	(1.6)
Ending balance		15.0	13.7
CIS [Member]
Goodwill [Roll Forward]
Beginning balance		150.9	0.0
Acquired goodwill	[1]	1.3	150.6
Effect of exchange rate changes		6.1	0.3
Ending balance		158.3	150.9
Americas [Member]
Goodwill [Roll Forward]
Accumulated impairment losses		31.6	31.6
Europe [Member]
Goodwill [Roll Forward]
Accumulated impairment losses		$ 8.7	$ 8.7

[1] See Note 2 for additional information about the goodwill recorded as a result of the acquisition of Luvata HTS.