Retirement Plans - Changes in Projected Benefit Obligation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 29, 2024	Dec. 31, 2023	Dec. 25, 2022
Pension Plan
Change in Projected Benefit Obligation
Interest cost	$ 1.5	$ 1.6	$ 1.1
Pension Plan | UNITED STATES
Change in Projected Benefit Obligation
Projected benefit obligation — beginning	30.1	30.3
Interest cost	1.5	1.6
Actuarial (gain) loss	(0.4)	1.5
Benefits paid	(3.5)	(3.3)
Curtailments	0.0	0.0
Projected benefit obligation — ending	27.7	30.1	30.3
Accumulated benefit obligation — ending	27.7	30.1
Change in Plan Assets
Fair value of plan assets — beginning	0.0	0.0
Fair value of plan assets — ending	0.0	0.0	0.0
Reconciliation of Funded Status
Projected benefit obligation	(27.7)	(30.1)	(30.3)
Fair value of plan assets	0.0	0.0	0.0
Funded status	(27.7)	(30.1)
Unrecognized prior service cost (credit)	0.0	0.0
Unrecognized net loss (earnings)	4.1	4.6
Net amount	(23.6)	(25.5)
Accrued liabilities	(2.8)	(3.0)
Other liabilities	(24.9)	(27.1)
Accumulated other comprehensive (earnings) loss	4.1	4.6
Postemployment Retirement Benefits
Change in Projected Benefit Obligation
Interest cost	1.0	1.1	0.8
Postemployment Retirement Benefits | UNITED STATES
Change in Projected Benefit Obligation
Projected benefit obligation — beginning	20.2	19.6
Interest cost	1.0	1.1
Actuarial (gain) loss	(0.9)	1.1
Benefits paid	(1.6)	(1.6)
Curtailments	0.9	0.0
Projected benefit obligation — ending	19.6	20.2	19.6
Accumulated benefit obligation — ending	19.6	20.2
Change in Plan Assets
Fair value of plan assets — beginning	0.0	0.0
Fair value of plan assets — ending	0.0	0.0	0.0
Reconciliation of Funded Status
Projected benefit obligation	(19.6)	(20.2)	(19.6)
Fair value of plan assets	0.0	0.0	$ 0.0
Funded status	(19.6)	(20.2)
Unrecognized prior service cost (credit)	(0.2)	(0.6)
Unrecognized net loss (earnings)	(2.5)	(2.6)
Net amount	(22.3)	(23.4)
Accrued liabilities	(1.6)	(1.5)
Other liabilities	(18.0)	(18.7)
Accumulated other comprehensive (earnings) loss	$ (2.7)	$ (3.2)