Employee Benefit Plans and Collective Bargaining Agreements (Amounts Recognized in Accumulated Other Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	Dec. 29, 2012	Dec. 31, 2011
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	$ 872.5	$ 843.5
Prior service cost (credit)	17.3	32.3
Amounts recognized in accumulated other comprehensive income	889.8	875.8
Other Post-Retirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	25.4	24.5
Prior service cost (credit)	(3.2)	(3.5)
Amounts recognized in accumulated other comprehensive income	$ 22.2	$ 21.0