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Revenue Recognition (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Nov. 30, 2019
Nov. 30, 2018
Nov. 30, 2019
Nov. 30, 2018
Revenue Recognition        
Favorable cumulative catch-up adjustments $ 1.9 $ 3.1 $ 1.9 $ 3.8
Unfavorable cumulative catch-up adjustments       0.5
Net favorable adjustments     $ 1.9 $ 3.3
Practical Expedient, Incremental costs of obtaining a contract     true  
Practical Expedient, Remaining performance obligations     true