Quarterly report pursuant to Section 13 or 15(d)

Service Revenue (Summary of Changes in Deferred Revenue Related to Material Rights Performance Obligations) (Details)

v3.23.1
Service Revenue (Summary of Changes in Deferred Revenue Related to Material Rights Performance Obligations) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 28, 2023
Feb. 28, 2022
Feb. 28, 2023
Feb. 28, 2022
Revenue from Contract with Customer [Abstract]        
Balance, beginning of period $ 55.2 $ 43.8 $ 48.9 $ 40.2
Deferral of revenue 10.9 9.1 31.0 25.4
Recognition of unearned revenue (7.6) (6.8) (21.4) (19.5)
Balance, end of period $ 58.5 $ 46.1 $ 58.5 $ 46.1