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Service Revenue (Summary of Changes in Deferred Costs to Obtain and Fulfill Contracts) (Details) - USD ($)
$ in Millions
 3 Months Ended
Aug. 31, 2024
Aug. 31, 2023
Capitalized Contract Cost [Line Items]    
Amortization $ 58.5 $ 57.2 [1]
Costs To Fulfill Contracts [Member]    
Capitalized Contract Cost [Line Items]    
Balance, beginning of period 76.6 75.3
Capitalization of costs 6.3 6.5
Amortization (6.7) (6.6)
Balance, end of period 76.2 75.2
Costs To Obtain Contracts [Member]    
Capitalized Contract Cost [Line Items]    
Balance, beginning of period 609.4 597.5
Capitalization of costs 45.3 55.7
Amortization (51.8) (50.6)
Balance, end of period $ 602.9 $ 602.6
[1] The consolidated statement of cash flows for the three months ended August 31, 2023 includes revisions to previously reported amounts related to the presentations of cash flows associated with short-term receivable purchased from the Company's clients under non-recourse arrangements, net of funding reserves. See Note A for further discussion on the revision.