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Shareholders' Equity (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Oct. 01, 2016
Oct. 03, 2015
Oct. 01, 2016
Oct. 03, 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 $ 3.0 $ 3.5 $ 10.1 $ 10.6
Excess income tax benefit recognized related to share-based compensation     0.2 $ 1.3
Unrecognized compensation cost related to share-based compensation $ 27.9   $ 27.9  
Weighted average period of recognition     2 years 2 months 12 days  
Number of shares available for grant 1,400,000   1,400,000  
Options and SAR's        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense     $ 3.4  
Unrecognized compensation cost related to share-based compensation $ 11.1   $ 11.1  
Weighted average period of recognition     3 years 5 months 6 days  
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     7 months 6 days  
Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense     $ 4.2  
Unrecognized compensation cost related to share-based compensation 10.7   $ 10.7  
Weighted average period of recognition     1 year 11 months 6 days  
Performance Share Units (PSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense     $ 1.7  
Unrecognized compensation cost related to share-based compensation $ 5.4   $ 5.4  
Weighted average period of recognition     2 years 2 months 6 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%