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Pension and Other Postretirement Plans - AOCI (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 25, 2022	Dec. 26, 2021
Change in Plan Assets
Net actuarial (losses) gains arising during period	$ (4.1)	$ (6.1)	$ 9.4
Pension Benefits
Change in Plan Assets
Beginning balance	12.8	7.2
Recognition of actuarial loss	(2.9)	(0.2)
Actuarial loss (gain)	7.9	(41.1)
Net actuarial (losses) gains arising during period	3.6	5.8
Current year net actuarial gain due to curtailment		0.0
Ending balance	13.5	12.8	7.2
Postretirement Benefits
Change in Plan Assets
Beginning balance	0.0	0.4
Recognition of actuarial loss	(0.3)	(0.4)
Actuarial loss (gain)	0.5	0.4
Net actuarial (losses) gains arising during period	0.5	0.3
Current year net actuarial gain due to curtailment		(0.3)
Ending balance	$ 0.2	$ 0.0	$ 0.4

X

- Definition

Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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Amount, before tax, of increase (decrease) to other comprehensive income from settlement and curtailment gain (loss) of defined benefit plan.

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