Stockholders' Equity (Schedule of accumulated other comprehensive loss balances, net of taxes) (Details) - USD ($) $ in Millions	May 27, 2018	May 28, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax:
Foreign currency translation adjustments	$ (701.6)	$ (624.7)
Unrealized gain (loss) from:
Securities	2.0	4.6
Hedge derivatives	(32.1)	1.5
Pension, other postretirement, and postemployment benefits:
Net actuarial gain (loss)	(1,723.6)	(1,645.4)
Prior service (costs) credits	26.3	19.5
Accumulated other comprehensive loss	$ (2,429.0)	$ (2,244.5)