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Pension and Other Postretirement Plans - Schedule of Net Periodic Costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 25, 2022
Dec. 26, 2021
Defined Benefit Plan Disclosure [Line Items]      
Recognition of actuarial losses $ 2.9 $ 0.9 $ 0.2
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0.0 0.0 0.0
Interest cost 6.5 5.1 4.7
Expected return on plan assets (7.1) (7.3) (7.5)
Recognition of actuarial losses 2.9 0.2 0.0
Settlement/Curtailment loss/(gain) 0.0 0.0 0.0
Net periodic cost (benefit) 2.3 (2.0) (2.8)
Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0.5 0.5 0.4
Interest cost 0.3 0.3 0.2
Expected return on plan assets 0.0 0.0 0.0
Recognition of actuarial losses 0.0 0.7 0.2
Settlement/Curtailment loss/(gain) 0.3 (0.3) 0.0
Net periodic cost (benefit) $ 1.1 $ 1.2 $ 0.8