Stockholders' Equity (Schedule of Components of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 29, 2015	Nov. 23, 2014	Nov. 29, 2015	Nov. 23, 2014
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ (85.2)	$ (102.5)	$ (86.6)	$ (128.1)
Gain (loss)	(2.0)	16.9	0.8	13.5
Reclassification realized in net earnings	22.2	5.8	20.8	34.8
Ending Balance	(65.0)	(79.8)	(65.0)	(79.8)
Foreign Currency Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(0.9)	(3.2)	(1.7)	(4.7)
Gain (loss)	0.1	(0.5)	0.9	(1.8)
Reclassification realized in net earnings	0.0	4.5	0.0	7.3
Ending Balance	(0.8)	0.8	(0.8)	0.8
Unrealized Gains (Losses) on Marketable Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	0.1	0.0	0.1	0.1
Gain (loss)	0.0	0.1	0.0	0.0
Reclassification realized in net earnings	0.0	0.0	0.0	0.0
Ending Balance	0.1	0.1	0.1	0.1
Unrealized Gains (Losses) on Derivatives
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(18.4)	(26.5)	(19.1)	(50.4)
Gain (loss)	(2.1)	2.7	(0.1)	0.7
Reclassification realized in net earnings	22.3	0.8	21.0	26.7
Ending Balance	1.8	(23.0)	1.8	(23.0)
Benefit Plan Funding Position
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(66.0)	(72.8)	(65.9)	(73.1)
Gain (loss)	0.0	14.6	0.0	14.6
Reclassification realized in net earnings	(0.1)	0.5	(0.2)	0.8
Ending Balance	$ (66.1)	$ (57.7)	$ (66.1)	$ (57.7)