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 |
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| 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 Capitalized Contract Cost No definition available.
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- Definition Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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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. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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