The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization expense expected to be recognized after the fifth fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization expense expected to be recognized during the fifth fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization expense expected to be recognized during the fourth fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization expense expected to be recognized during the third fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization expense expected to be recognized during the second fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Goodwill and Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Mar. 31, 2013
Goodwill [Roll Forward]
Goodwill, Beginning Balance			$ 28.7
Fluctuations in foreign currency			(0.1)
Goodwill, Ending Balance	28.6		28.6
Amortized intangible assets [Abstract]
Gross Carrying Value	13.4		13.4		13.1
Accumulated Amortization	(5.4)		(5.4)		(4.8)
Net Intangible Assets	8.0		8.0		8.3
Amortization Expense	0.2	0.1	0.4	0.3
Amortization expense, fiscal year maturity [Abstract]
Remainder of 2014	0.4		0.4
2015	1.1		1.1
2016	1.2		1.2
2017	1.3		1.3
2018	1.3		1.3
2019 & Beyond	2.7		2.7
Acquired technology [Member]
Amortized intangible assets [Abstract]
Gross Carrying Value	3.5		3.5		3.5
Accumulated Amortization	(0.2)		(0.2)		(0.1)
Net Intangible Assets	3.3		3.3		3.4
Tradenames [Member]
Amortized intangible assets [Abstract]
Gross Carrying Value	9.9		9.9		9.6
Accumulated Amortization	(5.2)		(5.2)		(4.7)
Net Intangible Assets	4.7		4.7		4.9
Asia [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance			0.5
Fluctuations in foreign currency			0
Goodwill, Ending Balance	0.5		0.5
South America [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance			12.2
Fluctuations in foreign currency			(1.0)
Goodwill, Ending Balance	11.2		11.2
Commercial Products [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance			16.0
Fluctuations in foreign currency			0.9
Goodwill, Ending Balance	$ 16.9		$ 16.9