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, 2021
Nov. 30, 2020
Nov. 30, 2021
Nov. 30, 2020
Capitalized Contract Cost [Line Items]        
Amortization     $ 99.1 $ 95.1
Costs To Fulfill Contracts [Member]        
Capitalized Contract Cost [Line Items]        
Balance, beginning of period $ 70.2 $ 67.5 69.3 67.3
Capitalization of costs 6.5 6.0 13.6 12.1
Amortization (6.2) (6.1) (12.4) (12.0)
Balance, end of period 70.5 67.4 70.5 67.4
Costs To Obtain Contracts [Member]        
Capitalized Contract Cost [Line Items]        
Balance, beginning of period 491.9 469.4 488.2 473.6
Capitalization of costs 52.4 40.4 99.0 77.6
Amortization (43.8) (41.7) (86.7) (83.1)
Balance, end of period $ 500.5 $ 468.1 $ 500.5 $ 468.1