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v3.20.4

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, 2020 | Nov. 30, 2019 | Nov. 30, 2020 | Nov. 30, 2019
Capitalized Contract Cost [Line Items] |  |  |  |
Amortization |  |  | $ 95.1 | $ 92.4
Costs To Obtain A Contract [Member] |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |
Beginning balance | $ 469.4 | $ 460.0 | 473.6 | 464.3
Capitalization of costs | 40.4 | 37.4 | 77.6 | 73.3
Amortization | (41.7) | (40.5) | (83.1) | (80.7)
Ending balance | 468.1 | 456.9 | 468.1 | 456.9
Costs To Fulfill A Contract [Member] |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |
Beginning balance | 67.5 | 66.3 | 67.3 | 66.1
Capitalization of costs | 6.0 | 6.0 | 12.1 | 12.0
Amortization | (6.1) | (5.9) | (12.0) | (11.7)
Ending balance | $ 67.4 | $ 66.4 | $ 67.4 | $ 66.4

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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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