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Income Taxes (Reconciliation of Gross Unrecognized Tax Benefits, Not Including Interest or Other Potential Offsetting Effects) (Details) - USD ($) $ in Millions | 12 Months Ended
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May 31, 2017 | May 31, 2016 | May 31, 2015
Income Taxes [Abstract] |  |  |
Balance as of beginning of fiscal year | $ 64.7 | $ 39.9 | $ 40.0
Additions for tax positions of the current year | 8.2 | 7.3 | 6.7
Additions for tax positions of prior years | 4.8 | 20.7 | 0.8
Reductions for tax positions of prior years | (2.5) | (0.1) | (0.4)
Settlements with tax authorities | (29.5) | (2.2) | (1.2)
Expiration of the statute of limitations | (2.0) | (0.9) | (6.0)
Balance as of end of fiscal year | $ 43.7 | $ 64.7 | $ 39.9

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- Definition Amount of unrecognized tax benefits. + 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) -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 Reference 2: 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 + 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=65882285&loc=SL6600010-109319 + Details
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