Stockholders' Equity (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	12 Months Ended
	May 27, 2018	May 28, 2017	May 29, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	$ 2,101.7	$ 1,952.0	$ 2,333.5
Reclassification of tax effect	(15.6)	0.0	0.0
Ending Balance	2,194.8	2,101.7	1,952.0
Foreign Currency Translation Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(0.7)	(1.2)
Gain (loss)	(0.9)	0.5
Reclassification realized in net earnings	0.0	0.0
Reclassification of tax effect	0.0
Ending Balance	(1.6)	(0.7)	(1.2)
Unrealized Gains (Losses) on Marketable Securities
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	0.1	0.1
Gain (loss)	0.0	0.0
Reclassification realized in net earnings	(0.1)	0.0
Reclassification of tax effect	0.0
Ending Balance	0.0	0.1	0.1
Unrealized Gains (Losses) on Derivatives
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	8.2	3.9
Gain (loss)	(4.6)	2.9
Reclassification realized in net earnings	0.0	1.4
Reclassification of tax effect	(0.2)
Ending Balance	3.4	8.2	3.9
Benefit Plan Funding Position
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(70.5)	(89.8)
Gain (loss)	(1.0)	6.4
Reclassification realized in net earnings	(0.1)	12.9
Reclassification of tax effect	(15.4)
Ending Balance	(87.0)	(70.5)	(89.8)
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(62.9)	(87.0)	(86.6)
Gain (loss)	(6.5)	9.8
Reclassification realized in net earnings	(0.2)	14.3
Reclassification of tax effect	(15.6)
Ending Balance	$ (85.2)	$ (62.9)	$ (87.0)