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Pension and Other Postretirement Plans - Schedule of Level 3 Plan Assets (Details) - Pension Benefits - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 25, 2022
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Beginning balance $ 119.4 $ 166.2
Ending balance 131.1 119.4
Fair Value, Recurring    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Beginning balance 119.4  
Ending balance 131.1 119.4
Group Annuity | Fair Value, Inputs, Level 3 | Fair Value, Recurring    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Beginning balance 0.0 4.8
Assets liquidated 0.0 (4.8)
Ending balance $ 0.0 $ 0.0