Goodwill and Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Mar. 31, 2020
Goodwill [Roll Forward]
Goodwill, beginning balance			$ 166.1
Effect of exchange rate changes			3.3
Goodwill, ending balance	$ 169.4		169.4
Intangible Assets [Abstract]
Gross carrying value	146.3		146.3		$ 142.7
Accumulated amortization	(41.7)		(41.7)		(36.4)
Net intangible assets	104.6		104.6		106.3
Amortization expense	2.1	$ 2.2	4.2	$ 4.4
Estimated Future Amortization Expense [Abstract]
Remainder of fiscal 2021	4.2		4.2
2022	8.0		8.0
2023	8.0		8.0
2024	8.0		8.0
2025	8.0		8.0
2026	8.0		8.0
CIS [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance			152.6
Effect of exchange rate changes			2.8
Goodwill, ending balance	155.4		155.4
BHVAC [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance			13.5
Effect of exchange rate changes			0.5
Goodwill, ending balance	14.0		14.0
Customer Relationships [Member]
Intangible Assets [Abstract]
Gross carrying value	62.6		62.6		60.8
Accumulated amortization	(14.9)		(14.9)		(12.6)
Net intangible assets	47.7		47.7		48.2
Trade Names [Member]
Intangible Assets [Abstract]
Gross carrying value	59.3		59.3		58.3
Accumulated amortization	(17.9)		(17.9)		(16.2)
Net intangible assets	41.4		41.4		42.1
Acquired Technology [Member]
Intangible Assets [Abstract]
Gross carrying value	24.4		24.4		23.6
Accumulated amortization	(8.9)		(8.9)		(7.6)
Net intangible assets	$ 15.5		$ 15.5		$ 16.0