Retirement Plans (Components Of Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2020	May 26, 2019	May 27, 2018
Defined Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0.0	$ 0.0	$ 0.0
Interest cost	3.3	9.3	8.6
Expected return on plan assets	(4.0)	(11.2)	(12.0)
Amortization of unrecognized prior service cost	0.0	0.0	0.0
Recognized net actuarial loss	1.8	2.5	2.8
Pension settlement charge	145.5	0.0	0.0
Net pension and postretirement cost (benefit)	146.6	0.6	(0.6)
Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.1	0.1	0.1
Interest cost	0.7	0.8	0.7
Expected return on plan assets	0.0	0.0	0.0
Amortization of unrecognized prior service cost	(4.8)	(4.8)	(4.8)
Recognized net actuarial loss	1.5	1.5	1.7
Pension settlement charge	0.0	0.0	0.0
Net pension and postretirement cost (benefit)	$ (2.5)	$ (2.4)	$ (2.3)