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Employee Benefit Plans (Details) - Schedule of accumulated benefit obligation in excess of plan assets - USD ($)
$ in Millions
May 31, 2016
May 31, 2015
Compensation and Retirement Disclosure [Abstract]    
Projected benefit obligations $ 164.8 $ 173.1
Accumulated benefit obligations 164.1 172.2
Fair value of plan assets $ 164.2 $ 173.7