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Equity - Earnings Per Share, Additional Information (Details) - shares
shares in Millions
3 Months Ended 9 Months Ended
Sep. 26, 2015
Sep. 27, 2014
Sep. 26, 2015
Sep. 27, 2014
Employee Stock Option        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share amount (in shares) 0.5 0.9 0.5 0.8
Restricted Stock and Restricted Stock Units        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share amount (in shares) 1.1 1.2 1.1 1.2