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Revenue Recognition (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 28, 2019
Feb. 28, 2018
Feb. 28, 2019
Feb. 28, 2018
Revenue Recognition        
Favorable cumulative catch-up adjustments $ 0.8 $ 8.3 $ 4.6 $ 9.3
Unfavorable cumulative catch-up adjustments   6.5 0.5 7.1
Net cumulative catch-up adjustments $ 0.8 $ 1.8 $ 4.1 $ 2.2
Incremental costs of obtaining a contract     true  
Remaining performance obligations     true