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Employee Benefit Plans (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 22, 2014
Mar. 23, 2013
Dec. 28, 2013
Dec. 29, 2012
Dec. 31, 2011
Compensation and Retirement Disclosure [Abstract]          
Net actuarial pension loss to be recognized as a component of net periodic benefit cost     $ 43.0    
Prior service cost to be recognized as a component of net periodic benefit cost     9.6    
Pending transactions not included in fair value measurements     37.2 19.6  
Contributions to pension and post-retirement benefit plans (5.1) (23.3) (56.3) (110.3) (151.2)
Amounts that are expected to be recognized as net periodic benefit cost     13.1    
Estimated plan contributions for remainder of the year $ 8