Quarterly report pursuant to Section 13 or 15(d)

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

v3.22.2.2
Service Revenue (Summary of Changes in Deferred Costs to Obtain and Fulfill Contracts) (Details) - USD ($)
$ in Millions
3 Months Ended
Aug. 31, 2022
Aug. 31, 2021
Capitalized Contract Cost [Line Items]    
Amortization $ 53.0 $ 49.1
Costs To Fulfill Contracts [Member]    
Capitalized Contract Cost [Line Items]    
Balance, beginning of period 72.3 69.3
Capitalization of costs 7.5 7.1
Amortization (6.4) (6.2)
Balance, end of period 73.4 70.2
Costs To Obtain Contracts [Member]    
Capitalized Contract Cost [Line Items]    
Balance, beginning of period 550.2 488.2
Capitalization of costs 57.0 46.6
Amortization (46.6) (42.9)
Balance, end of period $ 560.6 $ 491.9