Retirement and Postemployment Benefits - Components of Net Periodic Benefit Expense (Income) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Feb. 22, 2026	Nov. 23, 2025	Feb. 23, 2025	Feb. 22, 2026	Feb. 23, 2025
Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 10.6		$ 12.9	$ 31.5	$ 38.8
Interest cost	72.8		76.6	218.5	230.0
Expected return on plan assets	(101.3)		(104.9)	(303.9)	(314.9)
Amortization of losses (gains)	26.2		25.0	78.7	75.0
Amortization of prior service costs (credits)	0.3		0.3	0.9	1.0
Other adjustments	0.0		0.0	0.0	0.0
Curtailment loss (gain)		$ 6.7		6.7	0.0
Net expense (income)	8.6		9.9	32.4	29.9
Other Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.6		1.0	1.8	3.2
Interest cost	4.2		5.3	12.6	15.9
Expected return on plan assets	(8.4)		(9.0)	(25.2)	(26.9)
Amortization of losses (gains)	(6.4)		(5.1)	(19.4)	(15.4)
Amortization of prior service costs (credits)	(5.3)		(5.5)	(15.9)	(16.6)
Other adjustments	0.0		0.0	0.0	0.0
Curtailment loss (gain)				(0.5)	0.0
Net expense (income)	(15.3)		(13.3)	(46.6)	(39.8)
Postemployment Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	1.8		1.8	5.2	5.3
Interest cost	0.8		1.0	2.6	3.0
Expected return on plan assets	0.0		0.0	0.0	0.0
Amortization of losses (gains)	0.1		(0.3)	0.2	0.0
Amortization of prior service costs (credits)	(0.3)		(0.3)	(0.8)	(0.8)
Other adjustments	2.0		3.0	6.1	8.1
Curtailment loss (gain)				0.0	0.0
Net expense (income)	$ 4.4		$ 5.2	$ 13.3	$ 15.6