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Employee Benefit Plans (Details) - Schedule of changes in fair value level 3 assets - USD ($)
$ in Millions
12 Months Ended
May. 31, 2015
May. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance $ 6.2 $ 6.1
Actual Return on Plan Assets:    
Relating to assets still held at year-end 0.7 (0.1)
Relating to assets sold during the year 0.0 0.0
Purchases, sales and settlements, net (0.3) (0.3)
Transfers in and/or out of Level 3 0.0 0.0
Foreign currency translation (0.5) 0.5
Ending Balance $ 6.1 $ 6.2