Retirement Benefits - Schedule of Components of Net Periodic Benefit Cost (Details) $ in Millions	Dec. 28, 2025 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost (credit)	$ 0.1
Amortization of net actuarial loss	5.2
Amortization of accumulated other comprehensive loss	5.3
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost (credit)	0.4
Amortization of net actuarial loss	0.0
Amortization of accumulated other comprehensive loss	0.4
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost (credit)	(0.3)
Amortization of net actuarial loss	5.2
Amortization of accumulated other comprehensive loss	$ 4.9