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Debt (Details) - Schedule of Maturities of Long-term Debt (USD $)
In Millions, unless otherwise specified
Feb. 28, 2014
May 31, 2013
Feb. 28, 2013
Schedule of Maturities of Long-term Debt [Abstract]      
2015 $ 4.7    
2016 0    
2017 0    
2018 175.0    
Debt Long Term And Short Term Outstanding, Carrying Value $ 179.7 $ 2.0 $ 154.8