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SHAREHOLDERS' EQUITY (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Jul. 24, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock repurchased and retired (in shares) 579,005   930,005    
Treasury stock acquired, average cost per share $ 79.60   $ 77.55    
Repurchase of common stock, amount $ 46.1   $ 72.1    
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) 800,000   800,000    
Compensation expense $ 3.8 $ 4.1 $ 7.2 $ 7.1  
Excess income tax benefit recognized related to share-based compensation 0.9 $ 1.6 1.7 $ 2.7  
Unrecognized compensation cost related to share-based compensation $ 30.0   $ 30.0    
Weighted average period of recognition     2 years 5 months    
Number of shares available for grant 2,600,000   2,600,000    
Options and SAR's          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation expense     $ 1.8    
Unrecognized compensation cost related to share-based compensation $ 11.4   $ 11.4    
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    
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation expense     $ 3.7    
Unrecognized compensation cost related to share-based compensation 10.1   $ 10.1    
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     $ 1.1    
Unrecognized compensation cost related to share-based compensation $ 7.5   $ 7.5    
Weighted average period of recognition     2 years 2 months 6 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 | Performance Share Units (PSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance target percentage, payout     200.00%    
Subsequent Event          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock repurchase program, authorized amount         $ 250.0