Retirement Plans (Change In Plan Assets) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	May 27, 2018	May 26, 2019	May 27, 2018	May 28, 2017
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value at beginning of period		$ 253.8
Employer contributions	$ 60.4
Fair value at end of period	253.8	248.5	$ 253.8
Defined Benefit Plans
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value at beginning of period		253.8	207.7
Actual return on plan assets		12.1	0.9
Employer contributions		0.4	60.8	$ 0.4
Benefits paid		(17.8)	(15.6)
Fair value at end of period	253.8	248.5	253.8	207.7
Postretirement Benefit Plan
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value at beginning of period		0.0	0.0
Actual return on plan assets		0.0	0.0
Employer contributions		1.3	1.2	1.2
Benefits paid		(1.3)	(1.2)
Fair value at end of period	$ 0.0	$ 0.0	$ 0.0	$ 0.0