Stockholders' Equity (Schedule of Components of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 23, 2020	Feb. 24, 2019	Feb. 23, 2020	Feb. 24, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 2,273.7	$ 2,250.3	$ 2,392.6	$ 2,194.8
Gain (loss)	0.2	(1.8)	(12.1)	10.2
Reclassification realized in net earnings	(0.1)	(0.5)	109.9	(6.0)
Ending balance	2,341.2	2,315.7	2,341.2	2,315.7
Foreign Currency Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	4.5	(1.0)	(1.0)	(1.6)
Gain (loss)	0.0	(0.3)	5.5	0.3
Reclassification realized in net earnings	0.0	0.0	0.0	0.0
Ending balance	4.5	(1.3)	4.5	(1.3)
Unrealized Gains (Losses) on Derivatives
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	3.4	9.7	9.0	3.4
Gain (loss)	0.2	(1.5)	(4.9)	9.9
Reclassification realized in net earnings	0.5	(0.4)	0.0	(5.5)
Ending balance	4.1	7.8	4.1	7.8
Benefit Plan Funding Position
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(8.4)	(87.4)	(106.2)	(87.0)
Gain (loss)	0.0	0.0	(12.7)	0.0
Reclassification realized in net earnings	(0.6)	(0.1)	109.9	(0.5)
Ending balance	(9.0)	(87.5)	(9.0)	(87.5)
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(0.5)	(78.7)	(98.2)	(85.2)
Ending balance	$ (0.4)	$ (81.0)	$ (0.4)	$ (81.0)