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Accumulated Other Comprehensive Income (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
May. 31, 2015
May. 31, 2014
May. 31, 2013
AOCI Including Portion Attributable to Noncontrolling Interest [Abstract]      
Other comprehensive income, foreign currency transaction and translation adjustment, net of tax $ (28.6) $ 7.1 $ 7.2