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v3.20.2

Service Revenue (Summary of Changes in Deferred Costs to Obtain and Fulfill Contracts) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May 31, 2020 | May 31, 2019 | May 31, 2018
Capitalized Contract Cost [Line Items] |  |  |
Amortization | $ 186.1 | $ 180.2 | $ 174.7
Costs To Obtain A Contract [Member] |  |  |
Capitalized Contract Cost [Line Items] |  |  |
Beginning balance | 464.3 | 455.0 |
Capitalization of costs | 171.7 | 166.5 |
Amortization | (162.4) | (157.2) |
Ending balance | 473.6 | 464.3 | 455.0
Costs To Fulfill A Contract [Member] |  |  |
Capitalized Contract Cost [Line Items] |  |  |
Beginning balance | 66.1 | 65.4 |
Capitalization of costs | 24.9 | 23.7 |
Amortization | (23.7) | (23.0) |
Ending balance | $ 67.3 | $ 66.1 | $ 65.4

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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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