Service Revenue (Summary of Changes in Deferred Costs to Obtain and Fulfill Contracts) (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Nov. 30, 2020 |
Nov. 30, 2019 |
Nov. 30, 2020 |
Nov. 30, 2019 |
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| Capitalized Contract Cost [Line Items] | ||||
| Amortization | $ 95.1 | $ 92.4 | ||
| Costs To Obtain A Contract [Member] | ||||
| Capitalized Contract Cost [Line Items] | ||||
| Beginning balance | $ 469.4 | $ 460.0 | 473.6 | 464.3 |
| Capitalization of costs | 40.4 | 37.4 | 77.6 | 73.3 |
| Amortization | (41.7) | (40.5) | (83.1) | (80.7) |
| Ending balance | 468.1 | 456.9 | 468.1 | 456.9 |
| Costs To Fulfill A Contract [Member] | ||||
| Capitalized Contract Cost [Line Items] | ||||
| Beginning balance | 67.5 | 66.3 | 67.3 | 66.1 |
| Capitalization of costs | 6.0 | 6.0 | 12.1 | 12.0 |
| Amortization | (6.1) | (5.9) | (12.0) | (11.7) |
| Ending balance | $ 67.4 | $ 66.4 | $ 67.4 | $ 66.4 |
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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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