Employee Benefit Plans and Collective Bargaining Agreements (Contribution Expense on Multi-Employer Plans) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Defined Benefit Plan Disclosure [Line Items]
Multi-employer pension plan contributions	$ 310.0	$ 312.2	$ 292.3
Multiemployer Pension Plans, United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Multi-employer pension plan contributions	261.3	262.7	245.4
Canadians Pension Plans Of US Entity Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Multi-employer pension plan contributions	$ 48.7	$ 49.5	$ 46.9