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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, 2021 | May 31, 2020 | May 31, 2019
Income Taxes [Abstract] |  |  |
Balance as of beginning of fiscal year | $ 26.2 | $ 22.1 | $ 14.9
Additions for tax positions of the current year | 5.5 | 4.1 | 3.8
Additions for tax positions of prior years | 9.2 | 1.2 | 5.2
Reductions for tax positions of prior years |  | (0.6) |
Settlements with tax authorities | (15.2) |  | (1.2)
Expiration of the statute of limitations | (3.3) | (0.6) | (0.6)
Balance as of end of fiscal year | $ 22.4 | $ 26.2 | $ 22.1

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=120406818&loc=SL37586934-109318 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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