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Employee Benefit Plans (Details) - Schedule of recognized in accumulated other comprehensive loss - USD ($)
$ in Millions
May 31, 2016
May 31, 2015
Pension and post-retirement adjustments:    
Net actuarial gain (loss) $ (69.1) $ (65.7)
Net prior service credit 0.0 0.0
Net amount recognized in Accumulated other comprehensive income (loss) (69.1) (65.7)
Pension Plans [Member]    
Pension and post-retirement adjustments:    
Net actuarial gain (loss) (57.2) (54.0)
Net prior service credit 0.0 0.0
Net amount recognized in Accumulated other comprehensive income (loss) (57.2) (54.0)
Other Postretirement Benefits [Member]    
Pension and post-retirement adjustments:    
Net actuarial gain (loss) (11.9) (11.7)
Net prior service credit 0.0 0.0
Net amount recognized in Accumulated other comprehensive income (loss) $ (11.9) $ (11.7)