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Shareholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Oct. 03, 2015
Sep. 27, 2014
Oct. 03, 2015
Sep. 27, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock repurchased and retired (in shares) 180,000      
Stock repurchased and retired (in dollars per share) $ 66.56      
Stock repurchased and retired     $ 12.0  
Number of shares approved in repurchases program (in shares) 3,000,000.0   3,000,000.0  
Number of shares available for repurchase (in shares) 2,300,000   2,300,000  
Share-based compensation expense $ 3.5 $ 2.2 $ 10.6 $ 8.5
Excess income tax benefit recognized related to share-based compensation     1.3 $ 1.2
Unrecognized compensation cost related to share-based compensation $ 27.5   $ 27.5  
Weighted average period of recognition     2 years 3 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     $ 3.9  
Unrecognized compensation cost related to share-based compensation $ 12.0   $ 12.0  
Weighted average period of recognition     3 years 3 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     $ 0.8  
Unrecognized compensation cost related to share-based compensation 0.7   $ 0.7  
Weighted average period of recognition     6 months 24 days  
Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense     $ 4.6  
Unrecognized compensation cost related to share-based compensation 11.1   $ 11.1  
Weighted average period of recognition     2 years 12 days  
Performance Share Units (PSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense     $ 1.3  
Unrecognized compensation cost related to share-based compensation $ 3.7   $ 3.7  
Weighted average period of recognition     2 years 1 month 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%