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Employee Benefit Plans (Details) - Schedule of recognized in accumulated other comprehensive loss (USD $)
In Millions, unless otherwise specified
May 31, 2014
May 31, 2013
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax [Abstract]    
Net actuarial gain (loss) $ (56.9) $ (75.5)
Net prior service credit 0.3 0.5
Net amount recognized in Accumulated other comprehensive income (loss) (56.6) (75.0)
Other Postretirement Benefits [Member]
   
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax [Abstract]    
Net actuarial gain (loss) (9.3) (13.4)
Net prior service credit 0.3 0.5
Net amount recognized in Accumulated other comprehensive income (loss) (9.0) (12.9)
Pension Plans [Member]
   
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax [Abstract]    
Net actuarial gain (loss) (47.6) (62.1)
Net prior service credit 0 0
Net amount recognized in Accumulated other comprehensive income (loss) $ (47.6) $ (62.1)