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SHARE-BASED COMPENSATION PLANS (Details - Cash-settled Awards - Roll forward of SARs and cash-settled RSUs (excluding stock salary) as well as the related expenses) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Change in SARs (based on target amounts) as well as the related expenses      
Restricted stock expense $ 41.6    
Total unrecognized compensation costs $ 35.0    
Maximum      
Change in SARs (based on target amounts) as well as the related expenses      
Unrecongized compensation costs, period for recognition 3 years 3 months    
Minimum      
Change in SARs (based on target amounts) as well as the related expenses      
Unrecongized compensation costs, period for recognition 10 months 17 days    
RSUs      
Change in SARs (based on target amounts) as well as the related expenses      
Unvested, beginning of year (in shares) 1,634,610 595,250 0
Granted (in shares) 399,779 1,385,929 869,241
Vested (in shares) (774,350) (342,481) (273,991)
Forfeited (in shares) (28,854) (4,088) 0
Unvested, end of year (in shares) 1,231,185 1,634,610 595,250
Unvested, beginning of year (in shares) 1,634,610 595,250 0
Granted (in shares) 399,779 1,385,929 869,241
Vested (in shares) (774,350) (342,481) (273,991)
Forfeited (in shares) (28,854) (4,088) 0
Unvested, end of year (in shares) 1,231,185 1,634,610 595,250
RSUs | Maximum      
Change in SARs (based on target amounts) as well as the related expenses      
Unrecongized compensation costs, period for recognition 3 years    
RSUs | Minimum      
Change in SARs (based on target amounts) as well as the related expenses      
Unrecongized compensation costs, period for recognition 1 year