Retirement Benefits - Schedule of Reconciliation of the Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2025	Dec. 29, 2024	Dec. 31, 2023
Pension Benefits
Change in benefit obligations:
Benefit obligation at beginning of fiscal year	$ 305.6	$ 298.4
Service cost	5.3	5.8	$ 6.0
Interest cost	17.4	16.4	79.7
Benefits paid	(12.8)	(3.5)
Net actuarial (gains) losses – discount rate change	(2.0)	(9.7)
– other	19.5	(1.8)
Benefit obligation at end of fiscal year	333.0	305.6	298.4
Other Postretirement Benefits
Change in benefit obligations:
Benefit obligation at beginning of fiscal year	189.2	201.6
Service cost	0.4	0.5	0.6
Interest cost	9.9	10.2	10.9
Benefits paid	(24.1)	(25.4)
Net actuarial (gains) losses – discount rate change	3.5	(2.5)
– other	3.3	4.8
Benefit obligation at end of fiscal year	$ 182.2	$ 189.2	$ 201.6