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Pension and Other Postretirement Plans - Schedule of Level 3 Plan Assets (Details) - Pension Benefits - USD ($) $ in Millions | 12 Months Ended
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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

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