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Capital Stock and Stock-Based Awards (Details) - Schedule of Intrinsic value of stock options exercised, pretax stock-based compensation cost and related tax benefits - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
May 31, 2017
May 31, 2016
May 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Total intrinsic value of stock options exercised $ 11.0 $ 14.6 $ 5.8
Stock-based compensation cost (pretax) 10.1 9.7 11.3
Tax benefits related to stock-based compensation cost $ 0.8 $ 1.8 $ 2.1
Weighted average grant date fair value per option (in Dollars per share) $ 12.70 $ 14.78 $ 11.41