Income Taxes (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 30, 2012	Jan. 01, 2012
Current:
Accrued liabilities	$ 11.8	$ 11.8
Inventory valuation	11.5	11.1
Accrued vacation	11.1	10.4
Deferred compensation and other benefits plans	1.0	1.0
Intangible amortization	5.7	3.0
Long-term:
Postretirement benefits other than pensions	5.8	6.4
Accrued liabilities	9.4	18.3
Deferred compensation and other benefit plans	37.4	16.0
Tax credit and NOL carryforward amounts	34.0	28.2
Total deferred income tax assets	127.7	106.2
Current:
Other items	1.3	2.2
Long-term:
Property, plant and equipment differences	54.6	24.3
Intangible amortization	65.3	57.0
Other items	0	0.7
Total deferred income tax liabilities	121.2	84.2
Net deferred income tax assets	$ 6.5	$ 22.0