Retirement Plans (Changes In Benefit Obligation) (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2020	May 26, 2019	May 27, 2018
Defined Benefit Plans
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of period	$ 252.0	$ 237.2
Service cost	0.0	0.0	$ 0.0
Interest cost	3.3	9.3	8.6
Benefits paid	(272.2)	(17.8)
Actuarial (gain) loss	21.9	23.3
Benefit obligation at end of period	5.0	252.0	237.2
Postretirement Benefit Plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of period	19.8	19.9
Service cost	0.1	0.1	0.1
Interest cost	0.7	0.8	0.7
Benefits paid	(1.3)	(1.3)
Actuarial (gain) loss	1.6	0.3
Benefit obligation at end of period	$ 20.9	$ 19.8	$ 19.9