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Employee Benefit Plans (Accumulated Benefit Obligation in Excess of Plan Assets) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 28, 2013
Dec. 29, 2012
Compensation and Retirement Disclosure [Abstract]    
Projected benefit obligation $ 2,023.4 $ 2,635.4
Accumulated benefit obligation 1,978.3 2,554.4
Fair value of plan assets $ 1,644.2 $ 1,845.7