Stockholders' Equity (Schedule of Components of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 25, 2018	Nov. 26, 2017	Nov. 25, 2018	Nov. 26, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 2,275.2	$ 2,058.7	$ 2,194.8	$ 2,101.7
Gain (loss)	(2.1)	(2.0)	12.0	(5.3)
Reclassification realized in net earnings	(0.2)	(0.1)	(5.5)	0.0
Ending balance	2,250.3	1,976.1	2,250.3	1,976.1
Foreign Currency Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(1.2)	(1.2)	(1.6)	(0.7)
Gain (loss)	0.2	(0.2)	0.6	(0.7)
Reclassification realized in net earnings	0.0	0.0	0.0	0.0
Ending balance	(1.0)	(1.4)	(1.0)	(1.4)
Unrealized Gains (Losses) on Marketable Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	0.0	0.1	0.0	0.1
Gain (loss)	0.0	0.0	0.0	0.0
Reclassification realized in net earnings	0.0	(0.1)	0.0	(0.1)
Ending balance	0.0	0.0	0.0	0.0
Unrealized Gains (Losses) on Derivatives
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	12.0	5.6	3.4	8.2
Gain (loss)	(2.3)	(1.8)	11.4	(4.6)
Reclassification realized in net earnings	0.0	0.0	(5.1)	0.2
Ending balance	9.7	3.8	9.7	3.8
Benefit Plan Funding Position
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(87.2)	(70.6)	(87.0)	(70.5)
Gain (loss)	0.0	0.0	0.0	0.0
Reclassification realized in net earnings	(0.2)	0.0	(0.4)	(0.1)
Ending balance	(87.4)	(70.6)	(87.4)	(70.6)
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(76.4)	(66.1)	(85.2)	(62.9)
Ending balance	$ (78.7)	$ (68.2)	$ (78.7)	$ (68.2)