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STOCK COMPENSATION PLANS - Additional Information (Details) - USD ($)
$ in Millions
1 Months Ended 7 Months Ended 12 Months Ended 42 Months Ended
Jun. 30, 2017
Jul. 31, 2014
Jun. 30, 2012
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2012
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Defined contribution plan, maximum employee contribution percentage         75.00%          
Defined contribution plan, matching contributions         $ 0.3 $ 0.3 $ 0.3      
Restricted Stock [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Restricted stock, granted in period (in shares)         1,756,750 1,006,750        
Restricted shares vested (in shares)         3,285,671 1,526,731        
Restricted shares forfeited (in shares)         57,000 31,900        
Shares withheld for tax withholding for share-based compensation (in shares)         1,460,251 693,942 435,415      
Payments related to tax withholding for share-based compensation         $ 37.9 $ 14.7 $ 11.4      
Compensation expense         38.4 65.1 $ 30.8      
2012 Amended and Restated Plan [Member] | Restricted Stock [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares authorized (in shares)     3,200,000.0              
Restricted stock, granted in period (in shares)                 3,200,000  
Vesting period     5 years              
Restricted shares vested (in shares)       3,015,252            
Restricted shares forfeited (in shares)       137,248            
Compensation expense           $ 26.5        
Percent of compensation expense           60.00%        
2012 Amended and Restated Plan [Member] | Restricted Stock [Member] | Year One [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting rights, percentage     10.00%              
2012 Amended and Restated Plan [Member] | Restricted Stock [Member] | Year Two [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting rights, percentage     10.00%              
2012 Amended and Restated Plan [Member] | Restricted Stock [Member] | Year Three [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting rights, percentage     10.00%              
2012 Amended and Restated Plan [Member] | Restricted Stock [Member] | Year Four [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting rights, percentage     10.00%              
2012 Amended and Restated Plan [Member] | Restricted Stock [Member] | Year Five [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting rights, percentage     60.00%              
The Equity Plan [Member] | Restricted Stock [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Restricted stock, granted in period (in shares)                 5,000  
2014 Amended and Restated Plan [Member] | Restricted Stock [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares authorized (in shares)   6,000,000                
Restricted stock, granted in period (in shares)           1,000,000 1,700,000 3,300,000    
Restricted shares vested (in shares)                   3,397,906
Restricted shares forfeited (in shares)                   121,300
Postvesting restriction period   3 years                
Discount for postvesting restrictions   15.00%                
Unrecognized compensation cost related to unvested restricted shares       $ 33.8 $ 33.8         $ 33.8
Compensation cost not yet recognized period for recognition         3 years          
2014 Amended and Restated Plan [Member] | Performance Shares [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period   3 years                
2014 Amended and Restated Plan [Member] | Minimum [Member] | Restricted Stock [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period   3 years                
2014 Amended and Restated Plan [Member] | Maximum [Member] | Restricted Stock [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) 14,945,000                  
Restricted stock, granted in period (in shares)       1,700,000            
Vesting period 3 years                  
Restricted shares vested (in shares)       0            
Restricted shares forfeited (in shares)       0            
Postvesting restriction period 3 years                  
Discount for postvesting restrictions 12.50%                  
Unrecognized compensation cost related to unvested restricted shares       $ 22.1 $ 22.1         $ 22.1
Compensation cost not yet recognized period for recognition         3 years          
2017 Amended and Restated Plan [Member] | Performance Shares [Member] | Share-Based Compensation Award, 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%