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Pension and Other Postretirement Plans - Schedule of Plan Assets By Category (Details) - Pension Benefits - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 25, 2022 | Dec. 26, 2021
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets, amount | $ 131.1 | $ 119.4 | $ 166.2
Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets, amount | 131.1 | 119.4 |
Group Annuity | Fair Value, Recurring | Fair Value, Inputs, Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets, amount | 0.0 | 0.0 | $ 4.8
Cash and cash equivalents | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets, amount | 23.2 | 5.4 |
Equity | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets, amount | 28.5 | 31.0 |
Fixed income | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets, amount | 73.6 | 76.6 |
Multi-strategy hedge funds | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets, amount | 3.0 | 3.4 |
Real estate | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets, amount | $ 2.8 | $ 3.0 |

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