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Pension and Other Postretirement Plans - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 25, 2022 | Dec. 26, 2021
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected long-term rate of return on plan assets | 3.80% |  |
Employer contributions | $ 18.2 | $ 14.0 | $ 15.3
Fair Value Measured at Net Asset Value Per Share |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets, amount | 131.1 | 119.4 |
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, plan assets, amount | $ 131.1 | $ 119.4 | $ 166.2
Expected long-term rate of return on plan assets | 3.80% | 6.20% | 4.50%
Maximum | Equity Securities | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation | 75.00% |  |
Maximum | Fixed Income Securities | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation | 100.00% |  |
Maximum | Cash and cash equivalents | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation | 25.00% |  |
Maximum | Other Investments | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation | 20.00% |  |
Minimum | Fixed Income Securities | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation | 25.00% |  |

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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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