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Retirement Benefits and Postemployment Benefits (Schedule of plans with accumulated benefit obiligations in excess of plan assets) (Details) - Defined Benefit Pension Plans [Member] - USD ($)
$ in Millions
May 30, 2021
May 31, 2020
Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets [Abstract]    
Projected benefit obligation $ 615.3 $ 3,512.9
Accumulated benefit obligation 556.2 3,200.1
Plan assets at fair value $ 26.7 $ 2,569.9