Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Amortized intangible assets [Abstract]
Gross Carrying Value	$ 13.1	$ 10.4
Accumulated Amortization	(4.8)	(4.6)
Net Intangible Assets	8.3	5.8
Amortization expense	0.7	0.6	0.7
Future amortization expense for intangible assets [Abstract]
2014	0.8
2015	1.1
2016	1.2
2017	1.2
2018	1.2
2019 & Beyond	2.8
Tradenames [Member]
Amortized intangible assets [Abstract]
Gross Carrying Value	9.6	10.4
Accumulated Amortization	(4.7)	(4.6)
Net Intangible Assets	4.9	5.8
Acquired technology [Member]
Amortized intangible assets [Abstract]
Gross Carrying Value	3.5	0
Accumulated Amortization	(0.1)	0
Net Intangible Assets	$ 3.4	$ 0