Goodwill and Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Mar. 31, 2018
Goodwill [Roll Forward]
Goodwill, beginning balance			$ 173.8
Effect of exchange rate changes			(4.8)
Goodwill, ending balance	$ 169.0		169.0
Amortized intangible assets [Abstract]
Gross carrying value	145.4		145.4		$ 150.0
Accumulated amortization	(25.9)		(25.9)		(20.1)
Net intangible assets	119.5		119.5		129.9
Amortization expense	2.2	$ 2.5	6.8	$ 7.3
Estimated future amortization expense [Abstract]
Remainder of fiscal 2019	2.3		2.3
2020	9.0		9.0
2021	8.0		8.0
2022	8.0		8.0
2023	8.0		8.0
2024	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
BHVAC [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance			15.0
Effect of exchange rate changes			(1.2)
Goodwill, ending balance	13.8		13.8
CIS [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance			158.3
Effect of exchange rate changes			(3.6)
Goodwill, ending balance	154.7		154.7
Customer Relationships [Member]
Amortized intangible assets [Abstract]
Gross carrying value	62.1		62.1		64.2
Accumulated amortization	(8.3)		(8.3)		(5.7)
Net intangible assets	53.8		53.8		58.5
Trade Names [Member]
Amortized intangible assets [Abstract]
Gross carrying value	59.1		59.1		60.6
Accumulated amortization	(12.6)		(12.6)		(10.8)
Net intangible assets	46.5		46.5		49.8
Acquired Technology [Member]
Amortized intangible assets [Abstract]
Gross carrying value	24.2		24.2		25.2
Accumulated amortization	(5.0)		(5.0)		(3.6)
Net intangible assets	$ 19.2		$ 19.2		$ 21.6