Income Taxes - Deferred Income Tax Assets and Liabilities (Detail) - USD ($) $ in Millions	Dec. 30, 2016	Jan. 01, 2016
Current:
Allowances and other accrued liabilities	$ 0.0	$ (0.9)
Inventories	0.0	(14.0)
Total current deferred tax liabilities	0.0	(14.9)
Noncurrent:
Allowances and other accrued liabilities	(2.1)	0.0
Inventories	(14.8)	0.0
Property, plant and equipment	(63.9)	(64.6)
Equity in earnings of unconsolidated companies	(0.2)	(0.2)
Pension	(2.6)	(2.9)
Other noncurrent deferred tax liabilities	(8.1)	(6.4)
Total noncurrent deferred tax liabilities	(91.7)	(74.1)
Total current and noncurrent deferred tax liabilities	(91.7)	(89.0)
Current:
Net operating loss carryforwards	0.0	6.8
Allowances and other accrued assets	0.0	11.3
Inventories	0.0	5.0
Total current deferred tax assets	0.0	23.1
Valuation allowance	0.0	(11.2)
Total net current deferred tax assets	0.0	11.9
Noncurrent:
Allowances and other accrued assets	12.8	0.0
Inventories	7.1	0.0
Pension liability	22.9	21.1
Property, plant and equipment	1.6	2.0
Post-retirement benefits other than pension	1.1	0.7
Net operating loss carryforwards	225.5	209.1
Capital loss carryover	2.4	3.0
Other noncurrent assets	24.9	21.3
Total noncurrent deferred tax assets	298.3	257.2
Valuation allowance	(232.1)	(214.6)
Total net noncurrent deferred tax assets	66.2	42.6
Total deferred tax assets, net	66.2	54.5
Net deferred tax liabilities	$ (25.5)	$ (34.5)