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Employee Benefit Plans (Details) - Schedule Of Amounts Recognized In Balance Sheet - USD ($)
$ in Millions
May. 31, 2015
May. 31, 2014
Pension Plans [Member]    
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]    
Non-current assets $ 13.3 $ 19.4
Current liabilities 0.0 0.0
Non-current liabilities (12.6) (11.4)
Net funded balance 0.7 8.0
Other Postretirement Benefits [Member]    
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]    
Non-current assets 0.0 0.0
Current liabilities (2.6) (2.6)
Non-current liabilities (33.7) (30.8)
Net funded balance $ (36.3) $ (33.4)