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v3.25.2

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
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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