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STOCK COMPENSATION PLANS - Additional Information (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended 31 Months Ended 66 Months Ended
Jun. 30, 2017
Jul. 31, 2014
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2019
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Restricted stock, granted in period (in shares)     64,458 1,524,383            
Restricted shares vested (in shares)     1,729,046 1,713,878            
Restricted shares forfeited (in shares)     0 30,100            
Restricted Stock [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Shares paid for tax withholding for share-based compensation (in shares)     764,909 486,032 1,460,251          
Payments related to tax withholding for share-based compensation     $ 16.4 $ 8.8 $ 37.9          
Compensation expense     30.2 $ 37.1 $ 38.4          
2014 Amended and Restated Plan [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares authorized (in shares)   6,000,000.0                
Restricted stock, granted in period (in shares)           1,000,000.0 1,700,000 3,300,000    
Vesting period   3 years                
Postvesting restriction period   3 years                
Discount for postvesting restrictions   15.00%                
Restricted shares vested (in shares)                   5,883,597
Restricted shares forfeited (in shares)                   136,400
Unrecognized compensation cost related to unvested restricted shares     $ 0.3           $ 0.3 $ 0.3
2014 Amended and Restated Plan [Member] | Minimum [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period   3 years                
2014 Amended and Restated Plan [Member] | Maximum [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period   5 years                
2017 Amended and Restated Plan [Member] | Performance Shares [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares authorized (in shares) 3,300,000                  
Restricted stock, granted in period (in shares)     1,900,000 1,400,000            
Vesting period 3 years                  
Postvesting restriction period 3 years                  
Discount for postvesting restrictions 12.50%                  
Restricted shares vested (in shares)                 957,233  
Restricted shares forfeited (in shares)                 15,000  
Unrecognized compensation cost related to unvested restricted shares     $ 35.0           $ 35.0 $ 35.0
Unvested shares period for recognition (in years)     3 years              
2017 Amended and Restated Plan [Member] | Performance Shares [Member] | MSCI Index Relative Performance [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting rights, percentage 100.00%                  
2017 Amended and Restated Plan [Member] | Restricted Stock, Return On Equity [Member] | Year One [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting rights, percentage 33.33%                  
2017 Amended and Restated Plan [Member] | Restricted Stock, Return On Equity [Member] | Year Two [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting rights, percentage 33.33%                  
2017 Amended and Restated Plan [Member] | Restricted Stock, Return On Equity [Member] | Year Three [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting rights, percentage 33.33%                  
2017 Amended and Restated Plan [Member] | Restricted Stock, Time-Based [Member] | Year One [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting rights, percentage 33.33%                  
2017 Amended and Restated Plan [Member] | Restricted Stock, Time-Based [Member] | Year Two [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting rights, percentage 33.33%                  
2017 Amended and Restated Plan [Member] | Restricted Stock, Time-Based [Member] | Year Three [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting rights, percentage 33.33%