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Revenue Recognition (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Nov. 30, 2021
Nov. 30, 2020
Nov. 30, 2021
Nov. 30, 2020
Revenue Recognition        
Unfavorable cumulative catch-up adjustments $ (2.3)   $ (3.3)  
Favorable cumulative catch-up adjustments 8.2 $ 2.5 8.2 $ 2.8
Cumulative catch-up adjustments, net $ 5.9 $ 2.5 $ 4.9 $ 2.8
Practical Expedient, Incremental costs of obtaining a contract     true  
Practical Expedient, Remaining performance obligations     true