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 9 Months Ended
Feb. 28, 2022
Feb. 28, 2021
Feb. 28, 2022
Feb. 28, 2021
Capitalized Contract Cost [Line Items]        
Amortization     $ 150.2 $ 143.0
Costs To Fulfill Contracts [Member]        
Capitalized Contract Cost [Line Items]        
Balance, beginning of period $ 70.5 $ 67.4 69.3 67.3
Capitalization of costs 7.4 7.2 21.0 19.3
Amortization (6.3) (6.0) (18.7) (18.0)
Balance, end of period 71.6 68.6 71.6 68.6
Costs To Obtain Contracts [Member]        
Capitalized Contract Cost [Line Items]        
Balance, beginning of period 500.5 468.1 488.2 473.6
Capitalization of costs 70.1 49.9 169.1 127.5
Amortization (44.8) (41.9) (131.5) (125.0)
Balance, end of period $ 525.8 $ 476.1 $ 525.8 $ 476.1