Quarterly report pursuant to Section 13 or 15(d)

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

v3.23.4
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, 2023
Nov. 30, 2022
Nov. 30, 2023
Nov. 30, 2022
Capitalized Contract Cost [Line Items]        
Amortization     $ 115.1 $ 107.5
Costs To Fulfill Contracts [Member]        
Capitalized Contract Cost [Line Items]        
Balance, beginning of period $ 75.2 $ 73.4 75.3 72.3
Capitalization of costs 7.2 7.6 13.7 15.1
Amortization (6.6) (6.5) (13.2) (12.9)
Balance, end of period 75.8 74.5 75.8 74.5
Costs To Obtain Contracts [Member]        
Capitalized Contract Cost [Line Items]        
Balance, beginning of period 602.6 560.6 597.5 550.2
Capitalization of costs 53.7 50.0 109.4 107.0
Amortization (51.3) (48.0) (101.9) (94.6)
Balance, end of period $ 605.0 $ 562.6 $ 605.0 $ 562.6