Stockholders' Equity (Schedule of Components of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 25, 2018	Feb. 26, 2017	Feb. 25, 2018	Feb. 26, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			$ 2,101.7	$ 1,952.0
Reclassification of tax effect	$ (15.4)	$ 0.0	(15.4)	0.0
Ending balance	2,124.9	1,972.8	2,124.9	1,972.8
Foreign Currency Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(1.4)	(0.6)	(0.7)	(1.2)
Gain (loss)	(0.4)	(0.1)	(1.1)	0.5
Reclassification realized in net earnings	0.0	0.0	0.0	0.0
Reclassification of tax effect	0.0		0.0
Ending balance	(1.8)	(0.7)	(1.8)	(0.7)
Unrealized Gains (Losses) on Marketable Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	0.0	0.1	0.1	0.1
Gain (loss)	0.0	0.0	0.0	0.0
Reclassification realized in net earnings	0.0	0.0	(0.1)	0.0
Reclassification of tax effect	0.0		0.0
Ending balance	0.0	0.1	0.0	0.1
Unrealized Gains (Losses) on Derivatives
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	3.8	6.7	8.2	3.9
Gain (loss)	3.7	(0.7)	(0.9)	0.7
Reclassification realized in net earnings	(0.1)	0.0	0.1	1.4
Reclassification of tax effect	(0.2)		(0.2)
Ending balance	7.2	6.0	7.2	6.0
Benefit Plan Funding Position
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(70.6)	(89.5)	(70.5)	(89.8)
Gain (loss)	0.0	0.0	0.0	0.0
Reclassification realized in net earnings	0.0	0.1	(0.1)	0.4
Reclassification of tax effect	(15.2)		(15.2)
Ending balance	(85.8)	(89.4)	(85.8)	(89.4)
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(68.2)	(83.3)	(62.9)	(87.0)
Gain (loss)	3.3	(0.8)	(2.0)	1.2
Reclassification realized in net earnings	(0.1)	0.1	(0.1)	1.8
Reclassification of tax effect	(15.4)		(15.4)
Ending balance	$ (80.4)	$ (84.0)	$ (80.4)	$ (84.0)