Consolidated Statements of Comprehensive Income Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
May 27, 2012	May 29, 2011	May 30, 2010
Change in fair value of marketable securities, tax	$ 0.1	$ (0.1)	$ 0
Change in fair value of derivatives, tax	27.8	4.8	2.5
Net unamortized gain (loss) arising during period, including amortization of unrecognized net actuarial loss, tax	$ 24.8	$ (9.0)	$ 9.5

Tax effect of the gross appreciation or the gross loss, net of reclassification adjustment, in the value of the total unsold available-for-sale securities at the end of an accounting period.

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Total tax effect of the change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. The change includes an entity's share of an equity investee's increase or decrease in deferred hedging gains or losses. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

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- Definition

For each annual statement of income presented, the tax effect of the net gain (loss) recognized in other comprehensive income that is a reclassification adjustment of other comprehensive income as a result of being recognized as a component of net periodic benefit cost for the period.

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