Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 29, 2024	Dec. 31, 2023
Deferred tax assets:
Accounts receivable	$ 31.0	$ 31.8
Inventories	17.4	33.2
Loss and credit carryforwards	426.6	461.9
Operating leases	7.2	3.5
Operating expenses	30.6	19.1
Pension	7.3	6.9
Other compensation	51.9	46.4
Postretirement benefits	5.7	5.9
Interest rate hedge	4.4	4.8
Tax sharing agreement	0.3	0.3
Deferred revenue	0.3	0.4
Capitalized research and experimentation	116.5	100.6
Depreciation and amortization of long-lived assets	174.2	192.0
Interest expense limitation	15.6	28.7
Other	1.7	3.7
Gross deferred tax assets	890.7	939.2
Deferred tax liabilities:
Depreciation and amortization of long-lived assets	94.8	108.0
Equity method investment	1.9	19.0
Operating leases	4.9	1.1
Prepaid expenses	4.1	4.0
Other	14.6	22.8
Gross deferred tax liabilities	120.3	154.9
Valuation allowance	(412.5)	(432.0)
Net deferred income taxes	$ 357.9	$ 352.3