Goodwill and Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Mar. 31, 2016
Goodwill [Roll Forward]
Goodwill, beginning balance			$ 15.8
Effect of exchange rate changes			(1.2)
Goodwill, ending balance	$ 14.6		14.6
Amortized intangible assets [Abstract]
Gross carrying value	15.5		15.5		$ 16.4
Accumulated amortization	(8.5)		(8.5)		(8.2)
Net intangible assets	7.0		7.0		8.2
Amortization expense	0.4	$ 0.4	0.8	$ 0.8
Estimated future amortization expense [Abstract]
Remainder of 2017	0.8		0.8
2018	1.5		1.5
2019	1.4		1.4
2020	1.3		1.3
2021	0.7		0.7
2022 & Beyond	1.3		1.3
Asia [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance			0.5
Effect of exchange rate changes			0.0
Goodwill, ending balance	0.5		0.5
Building HVAC [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance			15.3
Effect of exchange rate changes			(1.2)
Goodwill, ending balance	14.1		14.1
Trade Names [Member]
Amortized intangible assets [Abstract]
Gross carrying value	8.4		8.4		8.9
Accumulated amortization	(6.2)		(6.2)		(6.3)
Net intangible assets	2.2		2.2		2.6
Acquired Technology [Member]
Amortized intangible assets [Abstract]
Gross carrying value	5.3		5.3		5.5
Accumulated amortization	(1.9)		(1.9)		(1.5)
Net intangible assets	3.4		3.4		4.0
Customer Relationships [Member]
Amortized intangible assets [Abstract]
Gross carrying value	1.8		1.8		2.0
Accumulated amortization	(0.4)		(0.4)		(0.4)
Net intangible assets	$ 1.4		$ 1.4		$ 1.6