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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

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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + 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 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(3) -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 6 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-6 + Details
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