Goodwill and Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2019
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 168.5
Effect of exchange rate changes	0.0
Goodwill, ending balance	168.5
Amortized intangible assets [Abstract]
Gross carrying value	144.6		$ 144.3
Accumulated amortization	(30.2)		(28.1)
Net intangible assets	114.4		116.2
Amortization expense	2.2	$ 2.3
Estimated future amortization expense [Abstract]
Remainder of fiscal 2020	6.7
2021	8.0
2022	8.0
2023	8.0
2024	8.0
2025	8.0
VTS [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	0.5
Effect of exchange rate changes	0.0
Goodwill, ending balance	0.5
CIS [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	153.9
Effect of exchange rate changes	0.3
Goodwill, ending balance	154.2
BHVAC [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	14.1
Effect of exchange rate changes	(0.3)
Goodwill, ending balance	13.8
Customer Relationships [Member]
Amortized intangible assets [Abstract]
Gross carrying value	61.7		61.5
Accumulated amortization	(10.1)		(9.1)
Net intangible assets	51.6		52.4
Trade Names [Member]
Amortized intangible assets [Abstract]
Gross carrying value	58.9		58.9
Accumulated amortization	(14.1)		(13.5)
Net intangible assets	44.8		45.4
Acquired Technology [Member]
Amortized intangible assets [Abstract]
Gross carrying value	24.0		23.9
Accumulated amortization	(6.0)		(5.5)
Net intangible assets	$ 18.0		$ 18.4