Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Goodwill [Roll Forward]
Beginning balance	$ 168.5	$ 173.8
Impairment charge	(0.5)
Effect of exchange rate changes	(1.9)	(5.3)
Ending balance	166.1	168.5
VTS [Member]
Goodwill [Roll Forward]
Beginning balance	0.5	0.5
Impairment charge	(0.5)
Effect of exchange rate changes	0.0	0.0
Ending balance	0.0	0.5
Accumulated impairment losses	40.8	40.3
CIS [Member]
Goodwill [Roll Forward]
Beginning balance	153.9	158.3
Impairment charge	0.0
Effect of exchange rate changes	(1.3)	(4.4)
Ending balance	152.6	153.9
BHVAC [Member]
Goodwill [Roll Forward]
Beginning balance	14.1	15.0
Impairment charge	0.0
Effect of exchange rate changes	(0.6)	(0.9)
Ending balance	$ 13.5	$ 14.1