Multiemployer Pension And Postretirement Plans (Multiemplyer Pension Plans Curtailments, Settlements and Termination Benefits) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Jan. 01, 2011	Jan. 02, 2010
Multiemployer Pension Plans Defined Benefit [Member]
Multiemployer Plans [Line Items]
Defined Benefit Plan, Multiemployer Plans, Curtailments And Special Termination Benefits	$ 12	$ 5	$ 12
Defined Benefit Plan, Recognized Net (Gain) Loss Due to Settlements		3	8
Defined Benefit Plan, Contributions by Employer	12.6	11.6	11.7
Multiemployer Pension Plans Defined Benefit [Member] | Maximum [Member]
Multiemployer Plans [Line Items]
Defined Benefit Plan Obligation Cash Payable Years	20
Multiemployer Other Postretirement Benefit Plans Defined Benefit Member [Member]
Multiemployer Plans [Line Items]
Defined Benefit Plan, Contributions by Employer	$ 14.0	$ 14.0	$ 14.0