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Income Taxes (Details 3) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
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May 31, 2012
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May 31, 2011
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May 31, 2010
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| Reconciliation of gross unrecognized tax benefits, not including interest or potential offsetting effects | |||
| Balance as of beginning of fiscal year | $ 41.2 | $ 35.8 | $ 35.8 |
| Additions for tax positions of the current year | 0.4 | 6.0 | 0.5 |
| Additions for tax positions of prior years | 1.3 | 0.1 | |
| Reductions for tax positions of prior years | (0.1) | (0.1) | |
| Settlements with tax authorities | (0.7) | ||
| Expiration of the statute of limitations | (0.4) | (0.6) | (0.5) |
| Balance as of end of fiscal year | $ 41.7 | $ 41.2 | $ 35.8 |
| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The gross amount of decreases in unrecognized tax benefits resulting from settlements with taxing authorities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The gross amount of decreases in unrecognized tax benefits resulting from lapses of the applicable statutes of limitations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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