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Share Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 30, 2013
Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense $ 3.4 $ 4.6
Stock Options [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock Options granted 493,363 544,991
Weighted average exercise price $ 103.32 $ 85.08
Weighted average fair value per option $ 29.33 $ 26.11
Remaining weighted average expense recognition period 25.7  
Remaining weighted average expense recognition period 1 year 6 months  
Restricted Stock Units (RSUs) [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock units granted 24,290 33,951
Weighted average fair value per share $ 102.99 $ 85.08
Remaining weighted average expense recognition period $ 5.2  
Remaining weighted average expense recognition period 1 year 10 months 24 days