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Service Revenue (Summary of Changes in Deferred Costs to Obtain and Fulfill Contracts) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Aug. 31, 2024 | Aug. 31, 2023
Capitalized Contract Cost [Line Items] |  |  |
Amortization | $ 58.5 | $ 57.2 | [1]
Costs To Fulfill Contracts [Member] |  |  |
Capitalized Contract Cost [Line Items] |  |  |
Balance, beginning of period | 76.6 | 75.3 |
Capitalization of costs | 6.3 | 6.5 |
Amortization | (6.7) | (6.6) |
Balance, end of period | 76.2 | 75.2 |
Costs To Obtain Contracts [Member] |  |  |
Capitalized Contract Cost [Line Items] |  |  |
Balance, beginning of period | 609.4 | 597.5 |
Capitalization of costs | 45.3 | 55.7 |
Amortization | (51.8) | (50.6) |
Balance, end of period | $ 602.9 | $ 602.6 |
[1] | The consolidated statement of cash flows for the three months ended August 31, 2023 includes revisions to previously reported amounts related to the presentations of cash flows associated with short-term receivable purchased from the Company's clients under non-recourse arrangements, net of funding reserves. See Note A for further discussion on the revision.

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- Definition Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 340 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479483/340-40-50-3 + Details
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- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 340 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479483/340-40-50-3 + Details
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