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Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions | 12 Months Ended
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May 31, 2020 | May 31, 2019 | May 31, 2018
Allowance for Doubtful Accounts [Member] |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |
Balance as of beginning of fiscal year |  | $ 7.5 | $ 7.0 | $ 6.0
Additions charged to expenses |  | 7.8 | 3.3 | 3.6
Additions to/(deductions from) other accounts | [1] | 3.0 | 0.7 |
Costs and deductions | [2] | 5.8 | 3.5 | 2.6
Balance as of end of fiscal year |  | 12.5 | 7.5 | 7.0
Reserve for Client Fund Losses [Member] |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |
Balance as of beginning of fiscal year |  | 2.7 | 2.4 | 3.0
Additions charged to expenses |  | 5.2 | 3.7 | 3.1
Additions to/(deductions from) other accounts | [1] | (3.0) |  |
Costs and deductions | [2] | 4.9 | 3.4 | 3.7
Balance as of end of fiscal year |  |  | $ 2.7 | $ 2.4
[1] | Amounts related to business acquisitions in fiscal 2019 and the reclassification of the reserve for client fund losses in fiscal 2020.
[2] | Uncollectible amounts written off, net of recoveries, and other adjustments.

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Amount of increase in valuation and qualifying accounts and reserves from charge to cost and expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Amount of increase in valuation and qualifying accounts and reserves from charge to accounts other than cost and expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Amount of decrease in valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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