Quarterly report pursuant to Section 13 or 15(d)

Service Revenue (Summary of Changes in Deferred Costs to Obtain and Fulfill Contracts) (Details)

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Service Revenue (Summary of Changes in Deferred Costs to Obtain and Fulfill Contracts) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Nov. 30, 2022
Nov. 30, 2021
Nov. 30, 2022
Nov. 30, 2021
Capitalized Contract Cost [Line Items]        
Amortization     $ 107.5 $ 99.1
Costs To Fulfill Contracts [Member]        
Capitalized Contract Cost [Line Items]        
Balance, beginning of period $ 73.4 $ 70.2 72.3 69.3
Capitalization of costs 7.6 6.5 15.1 13.6
Amortization (6.5) (6.2) (12.9) (12.4)
Balance, end of period 74.5 70.5 74.5 70.5
Costs To Obtain Contracts [Member]        
Capitalized Contract Cost [Line Items]        
Balance, beginning of period 560.6 491.9 550.2 488.2
Capitalization of costs 50.0 52.4 107.0 99.0
Amortization (48.0) (43.8) (94.6) (86.7)
Balance, end of period $ 562.6 $ 500.5 $ 562.6 $ 500.5