Stockholders' Equity (Schedule of accumulated other income income (loss)) (Details) - USD ($) $ in Millions	Feb. 25, 2018	May 28, 2017
Accumulated Other Comprehensive Loss, Net of Tax Effects [Abstract]
Foreign currency translation adjustments	$ (680.2)	$ (624.7)
Unrealized gain (loss) from:
Securities	7.3	4.6
Hedge derivatives	(11.0)	1.5
Pension, other postretirement, and postemployment benefits:
Net actuarial loss	(1,886.8)	(1,645.4)
Prior service credits	18.2	19.5
Accumulated other comprehensive loss	$ (2,552.5)	$ (2,244.5)