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Service Revenue (Summary of Changes in Deferred Costs to Obtain and Fulfill Contracts) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 28, 2022 | Feb. 28, 2021 | Feb. 28, 2022 | Feb. 28, 2021
Capitalized Contract Cost [Line Items] |  |  |  |
Amortization |  |  | $ 150.2 | $ 143.0
Costs To Fulfill Contracts [Member] |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |
Balance, beginning of period | $ 70.5 | $ 67.4 | 69.3 | 67.3
Capitalization of costs | 7.4 | 7.2 | 21.0 | 19.3
Amortization | (6.3) | (6.0) | (18.7) | (18.0)
Balance, end of period | 71.6 | 68.6 | 71.6 | 68.6
Costs To Obtain Contracts [Member] |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |
Balance, beginning of period | 500.5 | 468.1 | 488.2 | 473.6
Capitalization of costs | 70.1 | 49.9 | 169.1 | 127.5
Amortization | (44.8) | (41.9) | (131.5) | (125.0)
Balance, end of period | $ 525.8 | $ 476.1 | $ 525.8 | $ 476.1

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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=123353750&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=123353750&loc=SL49131252-203054 + Details
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