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Debt (Details) - Schedule of Maturities of Long-term Debt - USD ($)
$ in Millions
Nov. 30, 2015
May. 31, 2015
Nov. 30, 2014
Long-term Debt, Rolling Maturity [Abstract]      
2016 $ 12.0    
2017 0.0    
2018 0.0    
2019 0.0    
2020 and thereafter 0.0    
Total Debt $ 12.0 $ 6.0 $ 104.2