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Shareholders' Equity (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jul. 02, 2016
Jul. 04, 2015
Jul. 02, 2016
Jul. 04, 2015
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   2,300,000  
Compensation expense $ 3.8 $ 4.1 $ 7.1 $ 7.1
Excess income tax benefit recognized related to share-based compensation     (0.1) $ 1.2
Unrecognized compensation cost related to share-based compensation $ 30.9   $ 30.9  
Weighted average period of recognition     2 years 3 months  
Number of shares available for grant 1,300,000   1,300,000  
Options and SAR's        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense     $ 2.5  
Unrecognized compensation cost related to share-based compensation $ 12.0   $ 12.0  
Weighted average period of recognition     3 years 7 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     11 months 6 days  
Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense     $ 3.0  
Unrecognized compensation cost related to share-based compensation 11.9   $ 11.9  
Weighted average period of recognition     2 years 1 month 6 days  
Performance Share Units (PSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense     $ 1.0  
Unrecognized compensation cost related to share-based compensation $ 6.0   $ 6.0  
Weighted average period of recognition     2 years 4 months 12 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        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares approved in repurchases program (in shares) 3,000,000.0   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%