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Pension and Other Postretirement Plans (Tables)

12 Months Ended

Dec. 31, 2023

Retirement Benefits [Abstract]

Schedule of Accumulated and Projected Benefit Obligations

The primary factors contributing to actuarial gains and losses are changes in the discount rate used to value obligations as of the measurement date and the differences between expected and actual returns on pension plan assets.

(U.S. Dollars presented in millions)						Pension Benefits												Postretirement Benefits
Obligations and Funded Status						December 31, 2023						December 25, 2022						December 31, 2023						December 25, 2022
Change in the Projected Benefit Obligation (PBO):
Projected benefit obligation at beginning of year						$	128.9					$	173.3					$	3.2					$	3.5
Service cost						—						—						0.5						0.5
Interest cost						6.5						5.1						0.3						0.3
Actuarial loss (gain)						7.9						(41.1)						0.5						0.4
Benefits paid						(7.7)						(8.4)						(0.2)						(0.9)
Settlements/Curtailments gain						—						—						(0.2)						(0.6)
Projected benefit obligation at end of year						$	135.6					$	128.9					$	4.1					$	3.2
Accumulated benefit obligation at end of year (excludes the impact of future compensation increases)						$	135.6					$	128.9					$	2.9					$	2.3
Change in Plan Assets
Fair value of plan assets at beginning of year						$	119.4					$	166.2					$	—					$	—
Actual return on plan assets						11.3						(39.5)						—						—
Employer contributions						8.1						1.1						1.0						0.9
Benefits paid						(7.7)						(8.4)						(1.0)						(0.9)
Fair value of plan assets at end of year						$	131.1					$	119.4					$	—					$	—
Funded status (Fair value of plan assets less PBO)						$	(4.5)					$	(9.5)					$	(4.1)					$	(3.2)

Schedule of Amounts Recognized in Balance Sheet

The accumulated benefit obligation exceeds the fair value of the pension plan assets. Amounts recognized in the consolidated balance sheets consist of:

						Pension Benefits												Postretirement Benefits
(U.S. Dollars presented in millions)						December 31, 2023						December 25, 2022						December 31, 2023						December 25, 2022
Current liabilities						$	(0.1)					$	(0.1)					$	(0.6)					$	(0.4)
Noncurrent liabilities						(4.4)						(9.4)						(3.5)						(2.8)
Net amount recognized						$	(4.5)					$	(9.5)					$	(4.1)					$	(3.2)

Schedule of Amounts Recognized in Other Comprehensive Income (Loss)

The amounts in accumulated other comprehensive loss on the Consolidated Balance Sheets that have not yet been recognized as components of net periodic benefit cost were as follows:

(In U.S. Dollars in millions)						Pension Benefits						Postretirement Benefits
Net actuarial loss at December 26, 2021						$	7.2					$	0.4
Recognition of actuarial loss						(0.2)						(0.4)
Current year actuarial loss						5.8						0.3
Current year net actuarial gain due to curtailment						—						(0.3)
Net actuarial loss at December 25, 2022						$	12.8					$	—
Recognition of actuarial loss						(2.9)						(0.3)
Current year actuarial loss						3.6						0.5
Net actuarial loss at December 31, 2023						$	13.5					$	0.2

Schedule of Net Benefit Costs

Components of net periodic cost (benefit) were as follows:

Components of Net Periodic Cost (Benefit)						Pension Benefits																		Postretirement Benefits
(U.S. Dollars presented in millions)						2023						2022						2021						2023						2022						2021
Service cost						$	—					$	—					$	—					$	0.5					$	0.5					$	0.4
Interest cost						6.5						5.1						4.7						0.3						0.3						0.2
Expected return on plan assets						(7.1)						(7.3)						(7.5)						—						—						—
Recognition of actuarial losses						2.9						0.2						—						—						0.7						0.2
Settlement/Curtailment loss/(gain)						—						—						—						0.3						(0.3)						—
Net periodic cost (benefit)						$	2.3					$	(2.0)					$	(2.8)					$	1.1					$	1.2					$	0.8

Schedule of Assumptions Used to Calculate Benefit Obligation

Assumptions						Pension Benefits																		Postretirement Benefits
						2023						2022						2021						2023						2022						2021
Weighted-average assumptions used to determine benefit obligations at balance sheet date:
Discount rate						4.8		%				5.2		%				3.0		%				9.2		%				9.5		%				7.8		%
Weighted-average assumptions used to determine net cost (benefit) for years ended:
Discount rate						5.2%						3.0%						2.7%						9.4%						8.9%						7.0		%
Expected long-term rate of return on plan assets						3.8%						6.2%						4.5%						—%						—%						—%

Schedule of Allocation of Plan Assets

The fair value of the pension assets by major category of plan assets as of December 31, 2023 and December 25, 2022 were as follows:

(U.S. Dollars presented in millions)						Total as of balance sheet date
						2023						2022
Collective trusts:
Cash and cash equivalents						$	23.2					$	5.4
Equity						28.5						31.0
Fixed income						73.6						76.6
Multi-strategy hedge funds						3.0						3.4
Real estate						2.8						3.0
Total						$	131.1					$	119.4

Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets

A reconciliation of Level 3 measurements was as follows:

						Group annuity/ insurance contracts
(U.S. Dollars presented in millions)						2023						2022
Beginning of year						$	—					$	4.8
Assets liquidated						—						(4.8)
End of year						$	—					$	—

Schedule of Expected Benefit Payments

The following retirement benefit payments are expected to be paid by the respective plans:

(U.S. Dollars presented in millions)						Pension Benefits						Postretirement Benefits
2024						$	47.6					$	0.5
2025						$	7.2					$	0.5
2026						$	7.2					$	0.4
2027						$	7.2					$	0.4
2028						$	7.1					$	0.4
Years 2029-2033						$	33.7					$	2.5

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