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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, 2025 | Feb. 29, 2024 | Feb. 28, 2025 | Feb. 29, 2024
Capitalized Contract Cost [Line Items] |  |  |  |
Amortization |  |  | $ 176.6 | $ 173.4
Costs To Fulfill Contracts [Member] |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |
Balance, beginning of period | $ 75.8 | $ 75.8 | 76.6 | 75.3
Capitalization of costs | 6.9 | 7.5 | 19.5 | 21.2
Amortization | (6.7) | (6.7) | (20.1) | (19.9)
Balance, end of period | 76.0 | 76.6 | 76.0 | 76.6
Costs To Obtain Contracts [Member] |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |
Balance, beginning of period | 600.7 | 605.0 | 609.4 | 597.5
Capitalization of costs | 59.0 | 53.7 | 154.2 | 163.1
Amortization | (52.6) | (51.6) | (156.5) | (153.5)
Balance, end of period | $ 607.1 | $ 607.1 | $ 607.1 | $ 607.1

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- Definition Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 340 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479483/340-40-50-3 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 340 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479483/340-40-50-3 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 340 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479483/340-40-50-3 + Details
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