Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Jan. 01, 2023
Deferred income tax assets
Net operating loss tax carryovers	$ 133.0	$ 184.1
Pensions	2.2	51.7
Postretirement benefits other than pensions	48.5	51.5
Tax credits	43.5	42.0
Research and development	20.7	7.4
Inventory valuation	1.1	0.0
Other items	107.5	95.6
Gross deferred income tax assets	356.5	432.3
Valuation allowance for deferred tax assets	(60.3)	(266.9)
Total deferred income tax assets	296.2	165.4
Deferred income tax liabilities
Bases of property, plant and equipment	124.8	122.2
Inventory valuation	0.0	17.1
Basis of amortizable intangible assets	14.9	16.4
Other items	25.5	23.0
Total deferred tax liabilities	165.2	178.7
Net deferred tax asset	$ 131.0
Net deferred tax (liability)		$ (13.3)