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v3.20.1

Service Revenue (Summary of Changes in Deferred Costs to Obtain and Fulfill Contracts) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 29, 2020 | Feb. 28, 2019 | Feb. 29, 2020 | Feb. 28, 2019
Capitalized Contract Cost [Line Items] |  |  |  |
Amortization |  |  | $ 139.1 | $ 134.8
Costs To Obtain A Contract [Member] |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |
Beginning balance | $ 456.9 | $ 447.3 | 464.3 | 455.0
Capitalization of costs | 49.4 | 47.9 | 122.7 | 118.2
Amortization | (40.7) | (39.6) | (121.4) | (117.6)
Ending balance | 465.6 | 455.6 | 465.6 | 455.6
Costs To Fulfill A Contract [Member] |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |
Beginning balance | 66.4 | 65.8 | 66.1 | 65.4
Capitalization of costs | 6.7 | 5.9 | 18.7 | 17.8
Amortization | (6.0) | (5.7) | (17.7) | (17.2)
Ending balance | $ 67.1 | $ 66.0 | $ 67.1 | $ 66.0

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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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