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Shareholders' Equity (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jul. 04, 2015
Jun. 28, 2014
Jul. 04, 2015
Jun. 28, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares approved in repurchases program (up to) 3,000,000   3,000,000  
Number of shares repurchased     0  
Number of shares available for repurchase 2,500,000   2,500,000  
Share-based compensation expense $ 4.1 $ 3.6 $ 7.1 $ 6.3
Excess income tax benefit recognized related to share-based compensation     1.2 $ 1.2
Unrecognized compensation cost related to share-based compensation $ 30.4   $ 30.4  
Weighted average period of recognition     2 years 6 months  
Number of shares available for grant 2,000,000   2,000,000  
Options and SAR's        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense     $ 2.7  
Unrecognized compensation cost related to share-based compensation $ 13.0   $ 13.0  
Weighted average period of recognition     3 years 6 months  
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     $ 0.6  
Unrecognized compensation cost related to share-based compensation 1.0   $ 1.0  
Weighted average period of recognition     10 months 24 days  
Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense     $ 3.1  
Unrecognized compensation cost related to share-based compensation 12.2   $ 12.2  
Weighted average period of recognition     2 years 2 months 12 days  
Performance Share Units (PSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense     $ 0.7  
Unrecognized compensation cost related to share-based compensation $ 4.2   $ 4.2  
Weighted average period of recognition     2 years 3 months 18 days  
Performance period     3 years  
Targeted payout     100.00%  
Minimum | Performance Share Units (PSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance target percentage, payout     0.00%  
Maximum | Performance Share Units (PSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance target percentage, payout     200.00%