Retirement Benefits - Schedule of Actuarial Effects of Changes in Discount Rates (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Aug. 31, 2023	Dec. 28, 2025	Dec. 29, 2024
Pension Benefits
Change in plan assets:
Fair value of plan assets at beginning of fiscal year		$ 279.8	$ 289.1
Actual returns on plan assets and plan expenses		14.8	(9.1)
Employer contributions	$ 222.0	5.1	3.3
Benefits paid		(12.8)	(3.5)
Fair value of plan assets at end of fiscal year		286.9	279.8
Other Postretirement Benefits
Change in plan assets:
Fair value of plan assets at beginning of fiscal year		0.0	0.0
Actual returns on plan assets and plan expenses		0.0	0.0
Employer contributions		0.0	0.0
Benefits paid		0.0	0.0
Fair value of plan assets at end of fiscal year		$ 0.0	$ 0.0