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Supplemental Cash Flow Information (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
May 31, 2018
May 31, 2017
May 31, 2016
Supplemental Cash Flow Information [Abstract]      
Income taxes paid $ 319.1 $ 462.6 $ 369.9
Lease incentives received 7.7 $ 5.8 $ 4.3
Common stock issued in connection to aquisition $ 33.2