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, 2021 |
Feb. 29, 2020 |
Feb. 28, 2021 |
Feb. 29, 2020 |
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| Capitalized Contract Cost [Line Items] | ||||
| Amortization | $ 143.0 | $ 139.1 | ||
| Costs To Obtain Contracts [Member] | ||||
| Capitalized Contract Cost [Line Items] | ||||
| Balance, beginning of period | $ 468.1 | $ 456.9 | 473.6 | 464.3 |
| Capitalization of costs | 49.9 | 49.4 | 127.5 | 122.7 |
| Amortization | (41.9) | (40.7) | (125.0) | (121.4) |
| Balance, end of period | 476.1 | 465.6 | 476.1 | 465.6 |
| Costs To Fulfill Contracts [Member] | ||||
| Capitalized Contract Cost [Line Items] | ||||
| Balance, beginning of period | 67.4 | 66.4 | 67.3 | 66.1 |
| Capitalization of costs | 7.2 | 6.7 | 19.3 | 18.7 |
| Amortization | (6.0) | (6.0) | (18.0) | (17.7) |
| Balance, end of period | $ 68.6 | $ 67.1 | $ 68.6 | $ 67.1 |
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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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