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Service Revenue (Summary of Changes in Deferred Costs to Obtain and Fulfill Contracts) (Details) $ in Millions | 3 Months Ended
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Aug. 31, 2018 USD ($)
Costs To Obtain A Contract [Member] |
Capitalized Contract Cost [Line Items] |
Beginning balance | $ 455.0
Capitalization of costs | 32.4
Amortization | (38.9)
Ending balance | 448.5
Costs To Fulfill A Contract [Member] |
Capitalized Contract Cost [Line Items] |
Beginning balance | 65.4
Capitalization of costs | 6.0
Amortization | (5.7)
Ending balance | $ 65.7

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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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