Income Taxes - Deferred Income Tax Assets and Liabilities (Detail) - USD ($) $ in Millions	Dec. 28, 2018	Dec. 29, 2017
Deferred tax liabilities:
Allowances and other accrued liabilities	$ 0.0	$ 0.0
Inventories	(13.7)	(15.3)
Property, plant and equipment	(70.2)	(63.2)
Equity in earnings of unconsolidated companies	(0.1)	(0.1)
Pension obligations	(2.5)	(2.1)
Other noncurrent deferred tax liabilities	(6.5)	(5.6)
Total noncurrent deferred tax liabilities	(93.0)	(86.3)
Deferred tax assets:
Allowances and other accrued assets	10.6	10.6
Inventories	5.6	5.3
Pension obligations	24.8	24.9
Property, plant and equipment	2.3	1.5
Post-retirement benefits other than pension	1.0	1.1
Net operating loss carryforwards	287.1	249.7
Capital loss carryover	1.6	2.6
Other noncurrent assets	26.9	20.5
Total noncurrent deferred tax assets	359.9	316.2
Valuation allowance	(291.8)	(257.1)
Total deferred tax assets, net	68.1	59.1
Net deferred tax liabilities	$ (24.9)	$ (27.2)