Retirement Benefits - Schedule of Changes to Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2025	Dec. 29, 2024	Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]
Amortization of net actuarial loss	$ 5.1	$ 5.2	$ 6.0
Amortization of prior service cost (credit)	(0.5)	(0.5)	(0.6)
Settlement loss	0.0	0.0	1.1
Remeasurements	(6.7)	(2.2)	(3.8)
Pension Benefits
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]
Beginning of year accumulated other comprehensive loss	(7.1)	(7.4)
Amortization of net actuarial loss	0.0	0.0
Amortization of prior service cost (credit)	0.4	0.3
Settlement loss	0.0	0.0
Remeasurements	0.0	0.0
End of year accumulated other comprehensive loss	(6.7)	(7.1)	(7.4)
Net change in accumulated other comprehensive loss	0.4	0.3
Other Postretirement Benefits
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]
Beginning of year accumulated other comprehensive loss	(52.3)	(54.5)
Amortization of net actuarial loss	5.1	5.2
Amortization of prior service cost (credit)	(0.9)	(0.8)
Settlement loss	0.0	0.0
Remeasurements	(6.7)	(2.2)
End of year accumulated other comprehensive loss	(54.8)	(52.3)	$ (54.5)
Net change in accumulated other comprehensive loss	$ (2.5)	$ 2.2