Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 28, 2025	Dec. 29, 2024	Dec. 31, 2023
Deferred tax assets:
Loss and credit carryforwards	$ 451.5	$ 426.6
Depreciation and amortization of long-lived assets	186.1	183.1
Other compensation	46.4	51.9
Accounts receivable	32.2	31.0
Accrued expenses	16.9	18.8
Inventories	13.8	17.4
Royalty expense	10.1	3.8
Operating leases	9.8	7.2
Pension	7.3	7.3
Postretirement benefits	5.8	5.7
Interest rate hedge	4.2	4.4
Tax sharing agreement	0.5	0.3
Deferred revenue	0.0	0.3
Capitalized research and experimentation	0.0	116.5
Interest expense limitation	0.0	15.6
Other	3.1	0.8
Deferred tax assets, gross	787.7	890.7
Deferred tax liabilities:
Depreciation and amortization of long-lived assets	76.5	94.8
Capitalized research and experimentation	33.4	0.0
Operating leases	6.4	4.9
Prepaid expenses	5.5	4.1
Equity method investment	0.0	1.9
Other	12.0	14.6
Deferred tax liabilities, gross	133.8	120.3
Valuation allowance	(426.4)	(412.5)	$ (432.0)
Deferred income taxes, net	$ 227.5	$ 357.9