Service Revenue (Summary of Changes in Deferred Costs to Obtain and Fulfill Contracts) (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Aug. 31, 2025 |
Aug. 31, 2024 |
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| Capitalized Contract Cost [Line Items] | ||
| Amortization | $ 60.4 | $ 58.5 |
| Costs To Fulfill Contracts [Member] | ||
| Capitalized Contract Cost [Line Items] | ||
| Balance, beginning of period | 87.0 | 76.6 |
| Capitalization of costs | 19.6 | 6.3 |
| Amortization | (7.6) | (6.7) |
| Balance, end of period | 99.0 | 76.2 |
| Costs To Obtain Contracts [Member] | ||
| Capitalized Contract Cost [Line Items] | ||
| Balance, beginning of period | 609.0 | 609.4 |
| Capitalization of costs | 48.9 | 45.3 |
| Amortization | (52.8) | (51.8) |
| Balance, end of period | $ 605.1 | $ 602.9 |
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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. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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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