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Employee Benefit Plans (Details) - Schedule Of Amounts Recognized In Balance Sheet - USD ($)
$ in Millions
May 31, 2017
May 31, 2016
Other Postretirement Benefits [Member]    
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]    
Current assets $ 0.0 $ 0.0
Non-current assets 0.0 0.0
Current liabilities (2.1) (2.6)
Non-current liabilities (26.7) (35.7)
Net funded balance (28.8) (38.3)
U.S. [Member] | Pension Plans [Member]    
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]    
Current assets 4.7 0.0
Non-current assets 0.0 10.1
Current liabilities 0.0 0.0
Non-current liabilities 0.0 0.0
Net funded balance 4.7 10.1
U.K. [Member] | Pension Plans [Member]    
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]    
Current assets 0.0 0.0
Non-current assets 0.0 0.0
Current liabilities 0.0 0.0
Non-current liabilities (12.5) (10.7)
Net funded balance $ (12.5) $ (10.7)