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Shareholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
Dec. 28, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Treasury stock, shares acquired (shares) 576,804   180,000  
Treasury stock acquired (usd per share) $ 78.12   $ 66.56  
Repurchase of common stock $ 45.1 $ 0.0 $ 12.0  
Number of shares approved to be repurchased (shares) 3,000,000.0      
Remaining number of shares authorized to be repurchased (shares) 1,700,000      
Share-based compensation expense $ 13.6 13.3 13.9  
Income tax benefit recognized for share-based compensation 5.2 5.1 5.3  
Fair value of shares and options vested 11.9 $ 11.3 $ 10.9  
Unrecognized compensation cost related to share-based compensation $ 24.8      
Share-based compensation expected to recognize over a weighted average period, years 2 years 18 days      
Options and SAR's        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated share-based compensation expense $ 4.1      
Compensation costs not yet recognized $ 10.1      
Share-based compensation expected to recognize over a weighted average period, years 3 years 3 months 12 days      
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated share-based compensation expense $ 1.1      
Compensation costs not yet recognized $ 0.4      
Share-based compensation expected to recognize over a weighted average period, years 5 months 2 days      
Award vesting period 1 year      
Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated share-based compensation expense $ 6.2      
Compensation costs not yet recognized $ 8.8      
Share-based compensation expected to recognize over a weighted average period, years 1 year 7 months 30 days      
Performance Share Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated share-based compensation expense $ 2.2      
Compensation costs not yet recognized $ 5.5      
Share-based compensation expected to recognize over a weighted average period, years 2 years 3 days      
Performance award performance period 3 years      
Award vesting period 3 years      
Performance Share Units | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Potential payout as a percentage of target 0.00%      
Performance Share Units | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Potential payout as a percentage of target 200.00%      
Common Stock | 2013 Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Authorized shares of common stock (in shares)       3,500,000.0
Share available for future grant or payment under the various plans (in shares) 1,000,000