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Service Revenue (Summary of Changes in Deferred Costs to Obtain and Fulfill Contracts) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Aug. 31, 2019 | Aug. 31, 2018
Capitalized Contract Cost [Line Items] |  |  |
Amortization | $ 46.0 | $ 44.6 | [1]
Costs To Obtain A Contract [Member] |  |  |
Capitalized Contract Cost [Line Items] |  |  |
Beginning balance | 464.3 | 455.0 |
Capitalization of costs | 35.9 | 32.4 |
Amortization | (40.2) | (38.9) |
Ending balance | 460.0 | 448.5 |
Costs To Fulfill A Contract [Member] |  |  |
Capitalized Contract Cost [Line Items] |  |  |
Beginning balance | 66.1 | 65.4 |
Capitalization of costs | 6.0 | 6.0 |
Amortization | (5.8) | (5.7) |
Ending balance | $ 66.3 | $ 65.7 |
[1] | Amounts have been adjusted to reflect adoption of Accounting Standards Update (“ASU”) No. 2016-18, “Statement of Cash Flows (Topic 230): Restricted Cash (a consensus of the FASB Emerging Issues Task Force).”

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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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