Quarterly report [Sections 13 or 15(d)]

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

v3.25.1
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, 2025
Feb. 29, 2024
Feb. 28, 2025
Feb. 29, 2024
Revenue from Contract with Customer [Abstract]        
Balance, beginning of period $ 74.0 $ 69.8 $ 74.9 $ 62.0
Deferral of revenue 11.5 12.4 29.1 36.3
Recognition of unearned revenue (9.9) (8.9) (28.4) (25.0)
Balance, end of period $ 75.6 $ 73.3 $ 75.6 $ 73.3