Goodwill (Details) - USD ($) $ in Millions		12 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Goodwill [Roll Forward]
Beginning balance		$ 173.8	$ 165.1
Acquired goodwill	[1]		1.3
Effect of exchange rate changes		(5.3)	7.4
Ending balance		168.5	173.8
VTS [Member]
Goodwill [Roll Forward]
Beginning balance		0.5	0.5
Acquired goodwill	[1]		0.0
Effect of exchange rate changes		0.0	0.0
Ending balance		0.5	0.5
Accumulated impairment losses		40.3	40.3
CIS [Member]
Goodwill [Roll Forward]
Beginning balance		158.3	150.9
Acquired goodwill	[1]		1.3
Effect of exchange rate changes		(4.4)	6.1
Ending balance		153.9	158.3
BHVAC [Member]
Goodwill [Roll Forward]
Beginning balance		15.0	13.7
Acquired goodwill	[1]		0.0
Effect of exchange rate changes		(0.9)	1.3
Ending balance		$ 14.1	$ 15.0

[1] Represents measurement-period adjustments related to the Company's acquisition of Luvata HTS. See Note 2 for additional information about this acquisition.