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Goodwill and Other Intangibles (Details) - Schedule of other intangible assets subject to amortization - USD ($)
$ in Millions
 12 Months Ended
May. 31, 2015
May. 31, 2014
May. 31, 2013
Finite-Lived Intangible Assets [Line Items]      
Amortization expense $ (1.9) $ (2.0) $ (2.1)
Total other intangibles subject to amortization 4.7 5.8  
Trademarks and other 2.1 2.2  
Total other intangibles 6.8 8.0  
Customer Lists [Member]      
Finite-Lived Intangible Assets [Line Items]      
Begining balance   5.8 $ 8.0
Additions due to acquisition 0.8 0.0  
Amortization expense (1.9) (2.0)  
Accumulated amortization 4.2 3.3  
Other Intangible Assets [Member]      
Finite-Lived Intangible Assets [Line Items]      
Other 0.0 (0.2)  
Accumulated amortization $ 13.1 $ 12.1