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Share-based Employee Compensation (Performance Awards) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 15, 2013
Jun. 16, 2012
Jun. 15, 2013
Jun. 16, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Share-based employee compensation $ 12.2 $ 13.0 $ 25.4 $ 23.6