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Goodwill and Other Intangibles (Details) - Schedule of other intangible assets subject to amortization - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Feb. 29, 2016
Feb. 28, 2015
May. 31, 2015
May. 31, 2014
Intangible Assets, Net (Excluding Goodwill) [Abstract]        
Accumulated amortization $ 19.0 $ 16.8 $ 17.3  
Finite-lived Intangible Assets [Roll Forward]        
Begining balance 4.7 5.8 5.8  
Additions 2.4 0.8 0.8  
Amortization expense (1.7) (1.4) (1.9)  
Foreign currency translation (0.1) 0.0   $ 0.0
Total other intangibles subject to amortization, net of accumulated amortization of $17.8, $17.3 and $15.8, respectively 5.3 5.2 4.7  
Total other intangibles not subject to amortization 2.1 2.1 2.1  
Total other intangibles $ 7.4 $ 7.3 $ 6.8