Stockholders' Equity (Schedule of accumulated other income income (loss)) (Details) - USD ($) $ in Millions	Feb. 26, 2017	May 29, 2016
Accumulated Other Comprehensive Loss, Net Of Tax [Abstract]
Foreign currency translation adjustments	$ (498.2)	$ (644.2)
Unrealized gain (loss) from:
Securities	4.6	3.8
Hedge derivatives	(2.8)	(25.5)
Pension, other postretirement, and postemployment benefits:
Net actuarial loss	(1,867.7)	(1,958.2)
Prior service costs	13.7	11.9
Accumulated other comprehensive loss	$ (2,350.4)	$ (2,612.2)