Retirement Benefits - Schedule of Assets (Liabilities) (Details) - USD ($) $ in Millions	Dec. 28, 2025	Dec. 29, 2024
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	$ 0.0	$ 16.6
Current liabilities	(4.8)	(5.2)
Noncurrent liabilities	(41.4)	(37.2)
Total amount recognized	(46.2)	(25.8)
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	0.0	0.0
Current liabilities	(23.7)	(24.9)
Noncurrent liabilities	(158.5)	(164.3)
Total amount recognized	$ (182.2)	$ (189.2)