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Goodwill and Other Intangibles (Details) - Schedule of other intangible assets subject to amortization (USD $)
In Millions, unless otherwise specified
 9 Months Ended 12 Months Ended
Feb. 28, 2014
Feb. 28, 2013
May 31, 2013
May 31, 2012
Finite-Lived Intangible Assets [Line Items]        
Total other intangibles subject to amortization $ 10.8 $ 13.0 $ 12.6  
Trademarks and other 2.0 2.0 2.0  
Total other intangibles not subject to amortization 2.0 2.0 2.0  
Total other intangibles 12.8 15.0 14.6  
Customer Lists
        
Finite-Lived Intangible Assets [Line Items]        
Begining balance     3.4 4.3
Additions due to acquisition 0 0.1 0.1  
Amortization expense (0.7) (0.7) (1.0)  
Foreign currency translation 0 0 0  
Total other intangibles subject to amortization 2.7 3.7 3.4  
Other Intangible Assets
        
Finite-Lived Intangible Assets [Line Items]        
Begining balance     9.2 10.4
Additions due to acquisition 0 0 0.2  
Amortization expense (1.1) (1.2) (1.5)  
Foreign currency translation 0 0 0  
Other 0 0.1 0.1  
Total other intangibles subject to amortization $ 8.1 $ 9.3 $ 9.2