Retirement Plans (Changes In Benefit Obligation) (Details) - USD ($) $ in Millions	12 Months Ended
	May 28, 2017	May 29, 2016	May 31, 2015
Defined Benefit Plans
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of period	$ 298.5	$ 288.4
Service cost	0.0	0.0	$ 1.1
Interest cost	10.1	10.6	10.0
Plan settlements	(44.2)	0.0
Benefits paid	(10.0)	(15.9)
Actuarial (gain) loss	(2.1)	15.4
Benefit obligation at end of period	252.3	298.5	288.4
Postretirement Benefit Plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of period	19.9	18.0
Service cost	0.2	0.2	0.5
Interest cost	0.6	0.8	1.0
Benefits paid	(1.2)	(1.1)
Actuarial (gain) loss	1.3	2.0
Benefit obligation at end of period	$ 20.8	$ 19.9	$ 18.0