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Debt (Details) - Schedule of debt (USD $)
In Millions, unless otherwise specified
Feb. 28, 2014
May 31, 2013
Feb. 28, 2013
Debt (Details) - Schedule of debt [Line Items]      
Debt Long Term And Short Term Outstanding, Carrying Value $ 179.7 $ 2.0 $ 154.8
Debt Long Term And Short Term Outstanding, Fair Value 179.7 2.0 154.8
Less lines of credit, short-term debt and current portion of long-term debt (4.7) (2.0) (1.8)
Less lines of credit, short-term debt and current portion of long-term debt (4.7) (2.0) (1.8)
Total long-term debt 175.0 0 153.0
Total long-term debt 175.0 0 153.0
Revolving Credit Facility
     
Debt (Details) - Schedule of debt [Line Items]      
Line of Credit Facility, Amount Outstanding 175.0 0 0
Lines Of Credit Short-Term Debt And Long-Term Debt, Fair Value 175.0 0 0
Notes Due 2013 [Member]
     
Debt (Details) - Schedule of debt [Line Items]      
Debt Long Term And Short Term Outstanding, Carrying Value     153.0
Debt Long Term And Short Term Outstanding, Fair Value     153.0
Line of Credit [Member]
     
Debt (Details) - Schedule of debt [Line Items]      
Debt Long Term And Short Term Outstanding, Carrying Value 4.7 2.0 1.8
Debt Long Term And Short Term Outstanding, Fair Value $ 4.7 $ 2.0 $ 1.8