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Treasury Stock (Details) - Schedule of repurchase of common stock - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended 23 Months Ended
May 31, 2019
May 31, 2018
May 31, 2017
May 31, 2017
Mar. 21, 2018
Jul. 22, 2015
Class of Stock [Line Items]            
Stock Repurchase Program, Increase in Authorized Amount   $ 100.0     $ 50.0 $ 50.0
Amount of stock repurchased in period $ 8.5 $ 27.2 $ 6.9 $ 47.2    
Remaining authorized repurchase amount $ 52.8          
Shares of stock repurchased (in shares) 0.2          
Average cost of stock repurchased (in Dollars per share) $ 39.42          
Common Stock [Member]            
Class of Stock [Line Items]            
Common Stock, par value per share (in Dollars per share) $ 0.01 $ 0.01