Pension, Postretirement and Postemployment Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 25, 2022	Dec. 26, 2021
Pension
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 0.0	$ 0.0	$ 0.0
Interest cost	1.6	1.1	1.1
Expected return on assets	0.0	0.0	0.0
Amortization of actuarial loss	0.0	0.8	1.0
Curtailment/Settlement losses	0.0	0.0	0.5
Net periodic benefit cost (income)	1.6	1.9	2.6
Postretirement
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest cost	1.1	0.8	0.8
Amortization of prior service cost	(0.3)	(0.3)	0.0
Amortization of actuarial loss	(0.2)	0.1	0.0
Net periodic benefit cost (income)	$ 0.6	$ 0.6	$ 0.8