Stockholders' Equity (Schedule of accumulated other income income (loss)) (Details) (USD $) In Millions, unless otherwise specified	Feb. 24, 2013	May 27, 2012
Accumulated Other Comprehensive Loss Net Of Tax [Abstract]
Foreign currency translation adjustments	$ 379.8	$ 282.9
Unrealized gain (loss) from:
Securities	2.4	1.8
Hedge derivatives	(47.2)	(75.3)
Pension, other postretirement, and postemployment benefits:
Net actuarial gain (loss)	(1,874.0)	(1,945.9)
Prior service costs	(5.0)	(7.2)
Accumulated other comprehensive loss	$ (1,544.0)	$ (1,743.7)