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Income Taxes (Details 3) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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May 31, 2014 | May 31, 2013 | May 31, 2012
Reconciliation of gross unrecognized tax benefits |  |  |
Balance as of beginning of fiscal year | $ 26.7 | $ 41.7 | $ 41.2
Additions for tax positions of the current year | 11.2 | 28.5 | 0.4
Additions for tax positions of prior years | 4.2 | 12.2 | 1.3
Reductions for tax positions of prior years | (1.8) | (0.5) | (0.1)
Settlements with tax authorities | 0 | (55.0) | (0.7)
Expiration of the statute of limitations | (0.3) | (0.2) | (0.4)
Balance as of end of fiscal year | $ 40.0 | $ 26.7 | $ 41.7

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- Definition Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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