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Derivatives and Hedging (Details) - Not Designated as Hedging Instrument - Foreign Exchange Contract - USD ($)
$ in Millions
6 Months Ended
Nov. 30, 2018
Nov. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative notional amount $ 30.0 $ 36.5
Unrealized gain (loss) $ 0.9 $ 0.3