Retirement Benefits and Postemployment Benefits (Schedule of amounts recognized in AOCI) (Details) - USD ($) $ in Millions	May 30, 2021	May 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Net actuarial gain (loss)	$ (1,718.4)	$ (2,022.5)
Prior service (costs) credits	137.9	9.7
Amounts recorded in accumulated other comprehensive loss	(1,580.5)	(2,012.8)
Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial gain (loss)	(1,897.2)	(2,136.6)
Prior service (costs) credits	5.8	(6.0)
Amounts recorded in accumulated other comprehensive loss	(1,891.4)	(2,142.6)
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial gain (loss)	200.8	129.5
Prior service (costs) credits	133.7	21.0
Amounts recorded in accumulated other comprehensive loss	334.5	150.5
Postemployment Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial gain (loss)	(22.0)	(15.4)
Prior service (costs) credits	(1.6)	(5.3)
Amounts recorded in accumulated other comprehensive loss	$ (23.6)	$ (20.7)