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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, 2021 | Aug. 31, 2020
Capitalized Contract Cost [Line Items] |  |
Amortization | $ 49.1 | $ 47.3
Costs To Fulfill Contracts [Member] |  |
Capitalized Contract Cost [Line Items] |  |
Balance, beginning of period | 69.3 | 67.3
Capitalization of costs | 7.1 | 6.1
Amortization | (6.2) | (5.9)
Balance, end of period | 70.2 | 67.5
Costs To Obtain Contracts [Member] |  |
Capitalized Contract Cost [Line Items] |  |
Balance, beginning of period | 488.2 | 473.6
Capitalization of costs | 46.6 | 37.2
Amortization | (42.9) | (41.4)
Balance, end of period | $ 491.9 | $ 469.4

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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 http://asc.fasb.org/extlink&oid=68051541&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 http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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