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Pension, Postretirement and Postemployment Benefits (Tables)
 12 Months Ended
Dec. 25, 2022
Retirement Benefits [Abstract]  
Summary of Changes in Projected Benefit Obligation, Plan Assets and Funded Status
Reconciliations of the beginning and ending balances for the projected benefit obligation, the fair value of plan assets and the funded status are included below for the years ended December 25, 2022 and December 26, 2021.
PensionPostretirement
(In millions)2022202120222021
Change in Projected Benefit Obligation
Projected benefit obligation — beginning$41.6 46.0 28.1 29.9 
Interest cost1.1 1.1 0.8 0.8 
Transfer in— — — — 
Actuarial (gain) loss(9.3)(1.1)(7.6)0.4 
Benefits paid(3.1)(3.1)(1.7)(1.8)
Plan amendments— — — (1.2)
Settlements paid— (1.3)— — 
Projected benefit obligation — ending$30.3 41.6 19.6 28.1 
Accumulated benefit obligation — ending$30.3 41.6 19.6 28.1 
Change in Plan Assets
Fair value of plan assets — beginning$— $— — — 
Fair value of plan assets — ending$— — — — 
Reconciliation of Funded Status
Projected benefit obligation$(30.3)(41.6)(19.6)(28.1)
Fair value of plan assets— — — — 
Funded status(30.3)(41.6)(19.6)(28.1)
Unrecognized prior service cost (credit)— — (0.9)(1.2)
Unrecognized net loss3.2 13.2 (3.8)3.9 
Net amount$(27.1)(28.4)(24.3)(25.4)
Accrued liabilities$(3.0)(3.2)(1.5)(1.6)
Other liabilities(27.3)(38.4)(18.0)(26.5)
Accumulated other comprehensive (earnings) loss3.2 13.2 (4.8)2.7 
Net amount$(27.1)(28.4)(24.3)(25.4)
Assumptions used to determine year-end pension and postretirement benefit obligations
Assumptions used to determine the year-end pension and postretirement benefit obligations are as follows:
20222021
Pension
Weighted average discount rate5.61 %2.91 %
Mortality tablePriH-2012/Scale
MP - 2021		PriH-2012/Scale
MP - 2021
Postretirement
Discount rate5.58 %3.03 %
Health care cost trend rate assumed for next year7.00 %6.00 %
Rate to which the cost trend rate is assumed to decline (ultimate trend rate)5.00 %5.00 %
Year that the rate reaches the ultimate trend20312025
Components of Net Periodic Benefit Cost
The following presents detail of the components of the net periodic benefit cost for the three years ended December 25, 2022.
(In millions)202220212020
Components of Net Periodic Cost
Pension
Service cost$— — — 
Interest cost1.1 1.1 1.5 
Expected return on assets— — — 
Amortization of actuarial loss0.8 1.0 0.7 
Curtailment/Settlement losses— 0.5 — 
Net periodic benefit cost$1.9 2.6 2.2 
Postretirement
Interest cost0.8 0.8 0.9 
Amortization of service cost(0.3)— — 
Amortization of actuarial loss0.1 — — 
Net periodic benefit cost$0.6 0.8 0.9 
Assumptions Used to Determine Net Periodic Benefit Cost of Pension Plan and Postretirement Plan
Assumptions used to determine net periodic benefit cost of the pension plan and postretirement plan for each fiscal year follow:
202220212020
Pension
Weighted average discount rate2.91 %2.51 %3.33 %
Long-term rate of return on plan assetsN/AN/AN/A
Postretirement
Discount rate3.03 %2.72 %3.46 %
Health care cost trend rate assumed for next year6.00 %6.25 %6.25 %
Rate to which the cost trend rate is assumed to decline (ultimate trend rate)5.00 %5.00 %5.00 %
Year that the rate reaches the ultimate trend rate202520252024
Schedule of Expected Benefit Payments
Expected benefit payments under the defined benefit pension plans and the postretirement benefit plan for the next five years subsequent to 2022 and in the aggregate for the following five years are as follows:
(In millions)PensionPostretirement
2023$3.1 $1.6 
20243.0 1.6 
20252.9 1.5 
20262.8 1.5 
20272.7 1.5 
2028-203212.3 6.8