Retirement Benefits and Postemployment Benefits (Amounts Recognized in AOCI) (Details) - USD ($) $ in Millions	May 25, 2025	May 26, 2024
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	$ (1,726.8)	$ (1,806.3)
Prior service credits	65.9	81.7
Amounts recorded in accumulated other comprehensive loss	(1,660.9)	(1,724.6)
Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	(1,935.4)	(1,991.1)
Prior service credits	(7.5)	(9.8)
Amounts recorded in accumulated other comprehensive loss	(1,942.9)	(2,000.9)
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	212.7	190.4
Prior service credits	67.4	84.7
Amounts recorded in accumulated other comprehensive loss	280.1	275.1
Postemployment Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	(4.1)	(5.6)
Prior service credits	6.0	6.8
Amounts recorded in accumulated other comprehensive loss	$ 1.9	$ 1.2

Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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