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v3.19.1

Service Revenue (Summary of Changes in Deferred Costs to Obtain and Fulfill Contracts) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 28, 2019 | Feb. 28, 2019 | Feb. 28, 2018 | [2]
Capitalized Contract Cost [Line Items] |  |  |  |
Amortization | [1] |  | $ 134.8 | $ 130.5
Costs To Obtain A Contract [Member] |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |
Beginning balance |  | $ 447.3 | 455.0 |
Capitalization of costs |  | 47.9 | 118.2 |
Amortization |  | (39.6) | (117.6) |
Ending balance |  | 455.6 | 455.6 |
Costs To Fulfill A Contract [Member] |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |
Beginning balance |  | 65.8 | 65.4 |
Capitalization of costs |  | 5.9 | 17.8 |
Amortization |  | (5.7) | (17.2) |
Ending balance |  | $ 66.0 | $ 66.0 |
[1] | Amounts have been adjusted to reflect the 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)."
[2] | Amounts have been adjusted to reflect the adoption of ASC Topic 606.

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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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