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Stock Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 26, 2015
Sep. 27, 2014
Sep. 26, 2015
Sep. 27, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 21.1   $ 21.1  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition     1 year 8 months 12 days  
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Outstanding at December 27, 2014     2,192,136  
Weighted Average Exercise Price Per Share Outstanding, Beginning of Period     $ 48.95  
Granted     7,132  
Weighted Average Exercise Price Per Share Outstanding, Granted     $ 62.40  
Expired / Forfeited     (11,158)  
Weighted Average Exercise Price Per Share Outstanding, Expired/Forfeited     $ 69.28  
Exercised     (240,269)  
Weighted Average Exercise Price Per Share Outstanding, Exercised     $ 31.96  
Outstanding at September 26, 2015 1,947,841   1,947,841  
Weighted Average Exercise Price Per Share Outstanding, End of Period $ 50.96   $ 50.96  
Outstanding Shares Subject to Option, Aggregate Intrinsic Value $ 14.6   $ 14.6  
Exercisable at September 26, 2015 1,343,978   1,343,978  
Weighted Average Exercise Price Per Share Exercisable, End of Period $ 43.26   $ 43.26  
Options Exercisable at End of Period, Aggregate Intrinsic Value $ 14.6   $ 14.6  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value 4.7 $ 5.2 7.3 $ 19.1
Stock Option Expense $ 0.4 0.4 $ 1.5 1.3
Time Vested, Performance Vested and Market Vested Share Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Shares Outstanding, Beginning of Period     651,849  
Weighted Average Grant Date Fair Value, Beginning of Period     $ 59.76  
Shares Outstanding, Vested     (251,819)  
Weighted Average Grant Date Fair Value, Vested     $ 36.63  
Shares Outstanding, Forfeited     (9,213)  
Weighted Average Grant Date Fair Value, Forfeited     $ 75.12  
Shares Outstanding, End of Period 498,383   498,383  
Weighted Average Grant Date Fair Value, End of Period $ 73.12   $ 73.12  
Time, Performance and Market Vested Share Awards Expense $ 3.2 $ 2.7 $ 10.3 $ 10.2
Time Vested Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Shares Outstanding, Granted     22,339  
Weighted Average Grant Date Fair Value, Granted     $ 65.20  
Market Vested Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Shares Outstanding, Granted     23,637  
Weighted Average Grant Date Fair Value, Granted     $ 64.21  
Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Shares Outstanding, Granted     62,722  
Weighted Average Grant Date Fair Value, Granted     $ 72.61  
Shares Outstanding, Performance Share Adjustments     (1,132)  
Weighted Average Grant Date Fair Value, Performance Share Adjustments     $ 78.97