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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, 2015	May. 31, 2014	May. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Total intrinsic value of stock options exercised	$ 5.8	$ 4.6	$ 2.3
Stock-based compensation cost (pretax)	11.3	9.3	6.3
Tax benefits related to stock-based compensation cost	$ 2.1	$ 1.7	$ 0.8
Weighted average grant date fair value per option (in Dollars per share)	$ 11.41	$ 10.37	$ 9.77

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- Definition

The estimated fair value of stock options granted.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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