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Stock-Based Compensation Stock-Based Compensaiton - Summary of Unvested RSU Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Dec. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common Stock, Capital Shares Reserved for Future Issuance 12,800   12,800    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost $ 6.7 $ 3.3 $ 12.1 $ 6.1  
Employee Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options 41.3   41.3    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost $ 3.4 2.5 $ 6.8 5.5  
Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 2,707   2,707   2,708
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 95.54   $ 95.54   $ 95.51
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options $ 0.6   $ 0.6    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     7    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms     10 months 25 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 99.05    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period     0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value     $ 0.00    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expired in Period     0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expired, Weighed Average Grant Date Fair Value     $ 0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercised in Period     (8)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value     $ 88.40    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost $ 0.2 0.1 $ 0.4 0.2  
Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 313   313   233
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 88.34   $ 88.34   $ 90.70
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options $ 29.2   $ 29.2    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     197    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms     2 years 7 months 6 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 86.95    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period     (86)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value     $ 90.71    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expired in Period     0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expired, Weighed Average Grant Date Fair Value     $ 0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period     (31)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value     $ 90.70    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost $ 3.2 $ 0.6 $ 4.9 $ 0.6  
Chief Executive Officer [Member] | Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   2,700 2,700