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Shareholders' Equity (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Apr. 01, 2017
Apr. 02, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock repurchased and retired (in shares) 0  
Number of shares available for repurchase (in shares) 2,300,000  
Compensation expense $ 3.0 $ 3.3
Excess income tax benefit recognized related to share-based compensation 1.1 $ 1.3
Unrecognized compensation cost related to share-based compensation $ 20.7  
Weighted average period of recognition 1 year 9 months 18 days  
Number of shares available for grant 1,400,000  
Options and SAR's    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense $ 1.0  
Unrecognized compensation cost related to share-based compensation $ 8.9  
Weighted average period of recognition 3 years 1 month  
Award vesting period 5 years  
Award expiration period 10 years  
Restricted Stock Awards (RSAs)    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense $ 0.3  
Unrecognized compensation cost related to share-based compensation $ 0.1  
Weighted average period of recognition 1 month 6 days  
Restricted Stock Units (RSUs)    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense $ 1.3  
Unrecognized compensation cost related to share-based compensation $ 8.1  
Weighted average period of recognition 1 year 6 months 6 days  
Performance Share Units (PSUs)    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense $ 0.4  
Unrecognized compensation cost related to share-based compensation $ 3.6  
Weighted average period of recognition 1 year 10 months 12 days  
Performance period 3 years  
Minimum | Performance Share Units (PSUs)    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Performance target percentage, payout 0.00%  
Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares approved in repurchases program (in shares) 3,000,000.0  
Maximum | Performance Share Units (PSUs)    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Performance target percentage, payout 200.00%