Quarterly report pursuant to Section 13 or 15(d)

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

v3.23.1
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, 2023
Feb. 28, 2022
Feb. 28, 2023
Feb. 28, 2022
Capitalized Contract Cost [Line Items]        
Amortization     $ 163.0 $ 150.2
Costs To Fulfill Contracts [Member]        
Capitalized Contract Cost [Line Items]        
Balance, beginning of period $ 74.5 $ 70.5 72.3 69.3
Capitalization of costs 8.3 7.4 23.4 21.0
Amortization (6.6) (6.3) (19.5) (18.7)
Balance, end of period 76.2 71.6 76.2 71.6
Costs To Obtain Contracts [Member]        
Capitalized Contract Cost [Line Items]        
Balance, beginning of period 562.6 500.5 550.2 488.2
Capitalization of costs 65.2 70.1 172.2 169.1
Amortization (48.9) (44.8) (143.5) (131.5)
Balance, end of period $ 578.9 $ 525.8 $ 578.9 $ 525.8