Income Taxes (Details 2) (USD $) In Millions, unless otherwise specified	Jan. 01, 2012	Jan. 02, 2011
Current
Accrued liabilities	$ 11.8	$ 11.0
Inventory valuation	11.1	8.8
Accrued vacation	10.4	10.2
Deferred compensation and other benefits plans	1.0	0.9
Intangible amortization	3.0	0.9
Long-term
Postretirement benefits other than pensions	6.4	7.2
Accrued liabilities	18.3	8.9
Deferred compensation and other benefit plans	16.0	29.5
Tax credit and NOL carryforward amounts	28.2	1.5
Total deferred income tax assets	106.2	78.9
Current
Other items	2.2	3.4
Long-term
Property, plant and equipment differences	24.3	16.3
Intangible amortization	57.0	34.0
Other items	0.7	3.0
Total deferred income tax liabilities	84.2	56.7
Net deferred income tax assets	$ 22.0	$ 22.2