Retirement Plans (Funded Status And Amounts Recognized In Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	May 31, 2020	May 26, 2019
Defined Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Current liabilities	$ 0.0	$ 0.0
Noncurrent (assets) liabilities	5.0	3.5
Net amounts recognized	5.0	3.5
Prior service credit	0.0	0.0
Net actuarial gain (loss)	(1.6)	(100.4)
Net amounts recognized	(1.6)	(100.4)
Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Current liabilities	1.3	1.4
Noncurrent (assets) liabilities	19.6	18.4
Net amounts recognized	20.9	19.8
Prior service credit	0.2	3.8
Net actuarial gain (loss)	(8.8)	(8.7)
Net amounts recognized	$ (8.6)	$ (4.9)