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Income Taxes (Details 3) (USD $) In Millions	12 Months Ended
	May 31, 2011	May 31, 2010	May 31, 2009
Gross unrecognized tax benefits, not including interest or potential offsetting effects
Balance as of beginning of fiscal year	$ 35.8	$ 35.8	$ 25.7
Additions for tax positions of the current year	6.0	0.5	10.7
Additions for tax positions of the prior years	0.1		(0.2)
Reductions for tax positions of prior years	(0.1)
Settlements with tax authorities			(0.1)
Expiration of the statute of limitations	(0.6)	(0.5)	(0.3)
Balance as of end of fiscal year	$ 41.2	$ 35.8	$ 35.8

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- Definition

The gross amount of unrecognized tax benefits (tax reductions recognized in financial reports but excluded from tax returns) pertaining to uncertain tax positions taken in tax returns as of the beginning balance sheet date, excluding amounts pertaining to examined tax returns.

+ References

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-Publisher FASB
-Name FASB Interpretation (FIN)
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The gross amount of decreases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns.

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The gross amount of decreases in unrecognized tax benefits resulting from settlements with taxing authorities.

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- Definition

The gross amount of increases in unrecognized tax benefits resulting from tax positions that have been or will be taken in the tax return for the current period, excluding amounts pertaining to examined tax returns.

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The gross amount of increases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns.

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The gross amount of decreases in unrecognized tax benefits resulting from lapses of the applicable statutes of limitations.

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