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Share-Based Payments Narrative (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 25, 2011
Jun. 30, 2012
years
Jun. 25, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Mark-to-market stock-based compensation (benefit) expense, before tax (in dollars) $ 0.1   $ 0.1
Total unrecognized compensation expense related to non-vested shares from share-based compensation arrangements (in dollars)   $ 32.5  
Weighted-average period over which compensation expense is expected to be recognized (in years)   1.6  
Class B common stock, non-voting
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock approved by Board of Directors and available for issuance (in shares)   8.0  
Options and Sosars [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares)   0.2  
Rsus and Dsus [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares)   0.3  
PUs [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares)   0.7  
Authorized During Most Recent Quarter [Member] | Class B common stock, non-voting
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock approved by Board of Directors and available for issuance (in shares)   5.0