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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, 2018 | Nov. 30, 2018
Costs To Obtain A Contract [Member] |  |
Capitalized Contract Cost [Line Items] |  |
Beginning balance | $ 448.5 | $ 455.0
Capitalization of costs | 37.9 | 70.3
Amortization | (39.1) | (78.0)
Ending balance | 447.3 | 447.3
Costs To Fulfill A Contract [Member] |  |
Capitalized Contract Cost [Line Items] |  |
Beginning balance | 65.7 | 65.4
Capitalization of costs | 5.9 | 11.9
Amortization | (5.8) | (11.5)
Ending balance | $ 65.8 | $ 65.8

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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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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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