Goodwill and Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Mar. 31, 2019
Goodwill [Roll Forward]
Goodwill, beginning balance			$ 168.5
Effect of exchange rate changes			(2.4)
Goodwill, ending balance	$ 166.1		166.1
Amortized intangible assets [Abstract]
Gross carrying value	142.2		142.2		$ 144.3
Accumulated amortization	(31.9)		(31.9)		(28.1)
Net intangible assets	110.3		110.3		116.2
Amortization expense	2.2	$ 2.3	4.4	$ 4.6
Estimated future amortization expense [Abstract]
Remainder of fiscal 2020	4.4		4.4
2021	8.0		8.0
2022	8.0		8.0
2023	8.0		8.0
2024	8.0		8.0
2025	8.0		8.0
VTS [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance			0.5
Effect of exchange rate changes			0.0
Goodwill, ending balance	0.5		0.5
CIS [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance			153.9
Effect of exchange rate changes			(1.7)
Goodwill, ending balance	152.2		152.2
BHVAC [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance			14.1
Effect of exchange rate changes			(0.7)
Goodwill, ending balance	13.4		13.4
Customer Relationships [Member]
Amortized intangible assets [Abstract]
Gross carrying value	60.5		60.5		61.5
Accumulated amortization	(10.7)		(10.7)		(9.1)
Net intangible assets	49.8		49.8		52.4
Trade Names [Member]
Amortized intangible assets [Abstract]
Gross carrying value	58.2		58.2		58.9
Accumulated amortization	(14.7)		(14.7)		(13.5)
Net intangible assets	43.5		43.5		45.4
Acquired Technology [Member]
Amortized intangible assets [Abstract]
Gross carrying value	23.5		23.5		23.9
Accumulated amortization	(6.5)		(6.5)		(5.5)
Net intangible assets	$ 17.0		$ 17.0		$ 18.4