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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Nov. 30, 2011	Nov. 30, 2012	Nov. 30, 2011
Condensed Consolidated Statements of Comprehensive Income
Derivative instruments unrealized losses, tax	$ (0.1)	$ (0.2)	$ (1.5)

Tax effect on the change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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