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STOCK-BASED COMPENSATION (Details - Plan Information and P&L Impact)
$ / shares in Units, $ in Millions
6 Months Ended 12 Months Ended
Jan. 02, 2018
$ / shares
Jun. 30, 2018
Dec. 31, 2019
USD ($)
plan
$ / shares
shares
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
shares
STOCK-BASED COMPENSATION          
Number of active plans | plan     2    
Term of plan     10 years    
Income tax benefit related to non-cash compensation | $     $ 12.2 $ 11.2 $ 9.5
Excess tax benefit | $     $ 17.1 $ 77.6 $ 12.9
Equity Award Plan          
STOCK-BASED COMPENSATION          
Number of shares authorized     6,100,000    
Inducement Plan          
STOCK-BASED COMPENSATION          
Number of shares authorized     500,000    
Performance-Based Restricted Stock          
STOCK-BASED COMPENSATION          
Granted (in shares)     0   0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares     $ 0    
Time-Vested Performance Shares [Member]          
STOCK-BASED COMPENSATION          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares $ 21,900,000        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   6 months