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Revenue Recognition (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 28, 2022
Feb. 28, 2021
Feb. 28, 2022
Feb. 28, 2021
Revenue Recognition        
Unfavorable cumulative catch-up adjustments   $ (2.1) $ (3.3) $ (2.1)
Favorable cumulative catch-up adjustments $ 2.5 4.1 10.7 6.9
Net basis   $ 2.0    
Cumulative catch-up adjustments, net     $ 7.4 $ 4.8
Practical Expedient, Incremental costs of obtaining a contract     true  
Practical Expedient, Remaining performance obligations     true