Retirement Plans (Changes In Benefit Obligation) (Details) - USD ($) $ in Millions	12 Months Ended
	May 27, 2018	May 28, 2017	May 29, 2016
Defined Benefit Plans
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of period	$ 252.3	$ 298.5
Service cost	0.0	0.0	$ 0.0
Interest cost	8.6	10.1	10.6
Plan settlements	0.0	(44.2)
Benefits paid	(15.6)	(10.0)
Actuarial (gain) loss	(8.1)	(2.1)
Benefit obligation at end of period	237.2	252.3	298.5
Postretirement Benefit Plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of period	20.8	19.9
Service cost	0.1	0.2	0.2
Interest cost	0.7	0.6	0.8
Plan settlements	0.0	0.0
Benefits paid	(1.2)	(1.2)
Actuarial (gain) loss	(0.5)	1.3
Benefit obligation at end of period	$ 19.9	$ 20.8	$ 19.9