Goodwill and Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Mar. 31, 2015
Goodwill [Roll Forward]
Goodwill, beginning balance			$ 16.2
Effect of exchange rate changes			0.3
Goodwill, ending balance	$ 16.5		16.5
Amortized intangible assets [Abstract]
Gross Carrying Value	16.9		16.9		$ 16.8
Accumulated Amortization	(7.7)		(7.7)		(6.9)
Net Intangible Assets	9.2		9.2		9.9
Amortization expense	0.4	$ 0.4	0.8	$ 0.8
Estimated future amortization expense [Abstract]
Remainder of 2016	0.8		0.8
2017	1.6		1.6
2018	1.6		1.6
2019	1.5		1.5
2020	1.4		1.4
2021 & Beyond	2.3		2.3
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			15.7
Effect of exchange rate changes			0.3
Goodwill, ending balance	16.0		16.0
Trade Names [Member]
Amortized intangible assets [Abstract]
Gross Carrying Value	9.2		9.2		9.1
Accumulated Amortization	(6.2)		(6.2)		(5.8)
Net Intangible Assets	3.0		3.0		3.3
Acquired Technology [Member]
Amortized intangible assets [Abstract]
Gross Carrying Value	5.6		5.6		5.6
Accumulated Amortization	(1.2)		(1.2)		(0.9)
Net Intangible Assets	4.4		4.4		4.7
Customer Relationships [Member]
Amortized intangible assets [Abstract]
Gross Carrying Value	2.1		2.1		2.1
Accumulated Amortization	(0.3)		(0.3)		(0.2)
Net Intangible Assets	$ 1.8		$ 1.8		$ 1.9