Quarterly report pursuant to Section 13 or 15(d)

Service Revenue (Summary of Changes in Deferred Revenue Related to Set-Up Fees) (Details)

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Service Revenue (Summary of Changes in Deferred Revenue Related to Set-Up Fees) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 28, 2022
Feb. 28, 2021
Feb. 28, 2022
Feb. 28, 2021
Service Revenue [Abstract]        
Balance, beginning of period $ 43.8 $ 39.6 $ 40.2 $ 42.6
Deferral of revenue 9.1 6.9 25.4 16.6
Recognition of unearned revenue (6.8) (6.7) (19.5) (19.4)
Balance, end of period $ 46.1 $ 39.8 $ 46.1 $ 39.8