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Service Revenue (Summary of Changes in Deferred Costs to Obtain and Fulfill Contracts) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2022 | Nov. 30, 2021 | Nov. 30, 2022 | Nov. 30, 2021
Capitalized Contract Cost [Line Items] |  |  |  |
Amortization |  |  | $ 107.5 | $ 99.1
Costs To Fulfill Contracts [Member] |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |
Balance, beginning of period | $ 73.4 | $ 70.2 | 72.3 | 69.3
Capitalization of costs | 7.6 | 6.5 | 15.1 | 13.6
Amortization | (6.5) | (6.2) | (12.9) | (12.4)
Balance, end of period | 74.5 | 70.5 | 74.5 | 70.5
Costs To Obtain Contracts [Member] |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |
Balance, beginning of period | 560.6 | 491.9 | 550.2 | 488.2
Capitalization of costs | 50.0 | 52.4 | 107.0 | 99.0
Amortization | (48.0) | (43.8) | (94.6) | (86.7)
Balance, end of period | $ 562.6 | $ 500.5 | $ 562.6 | $ 500.5

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126905575&loc=SL49131252-203054 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126905575&loc=SL49131252-203054 + Details
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