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Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Consolidated Statements of Stockholders' Equity [Abstract]
Foreign currency translation adjustment, taxes	$ (2.6)	$ 1.4	$ 4.2
Unrealized gain on available-for-sale securities, tax (benefit) provision	$ (0.2)	$ 0.6	$ 1.4

Tax effect of the adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into functional currency of the reporting entity. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

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- Definition

Tax effect on gross appreciation or the gross loss in value of the total of unsold securities during the period being reported on.

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