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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, 2021 | Feb. 29, 2020 | Feb. 28, 2021 | Feb. 29, 2020
Capitalized Contract Cost [Line Items] |  |  |  |
Amortization |  |  | $ 143.0 | $ 139.1
Costs To Obtain Contracts [Member] |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |
Balance, beginning of period | $ 468.1 | $ 456.9 | 473.6 | 464.3
Capitalization of costs | 49.9 | 49.4 | 127.5 | 122.7
Amortization | (41.9) | (40.7) | (125.0) | (121.4)
Balance, end of period | 476.1 | 465.6 | 476.1 | 465.6
Costs To Fulfill Contracts [Member] |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |
Balance, beginning of period | 67.4 | 66.4 | 67.3 | 66.1
Capitalization of costs | 7.2 | 6.7 | 19.3 | 18.7
Amortization | (6.0) | (6.0) | (18.0) | (17.7)
Balance, end of period | $ 68.6 | $ 67.1 | $ 68.6 | $ 67.1

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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=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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