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Taxes (Details) - Schedule of unrecognized tax benefits - USD ($) $ in Millions | 12 Months Ended
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May 31, 2019 | May 31, 2018 | May 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Gross unrecognized benefits, Beginning of period | $ 10.1 | $ 14.1 | $ 17.9
Decreases related to prior year tax positions | (1.1) | (2.6) | (6.3)
Increase related to prior year tax positions | 0.2 | 0.4 | 0.1
Increases related to current year tax positions | 0.7 | 0.5 | 3.0
Settlements during the period | (0.2) | (1.9) | (0.6)
Lapse of statute of limitation | (0.7) | (0.4) | 0.0
Gross unrecognized benefits, End of period | $ 9.0 | $ 10.1 | $ 14.1

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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=84176650&loc=SL37586934-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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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