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STOCK COMPENSATION PLANS - Additional Information (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended 19 Months Ended 54 Months Ended 72 Months Ended
Jun. 30, 2017
Jul. 31, 2014
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2012
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Restricted stock, granted in period (in shares)     1,524,383 1,756,750                
Restricted shares vested (in shares)     1,713,878 3,285,671                
Restricted shares forfeited (in shares)     30,100 57,000                
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)     486,032 1,460,251 693,942              
Payments related to tax withholding for share-based compensation     $ 8.8 $ 37.9 $ 14.7              
Compensation expense     37.1 $ 38.4 65.1              
2012 Amended and Restated Plan [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  
2012 Amended and Restated Plan [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] | Year Five [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Award vesting rights, percentage               60.00%        
2012 Amended and Restated Plan [Member] | Restricted Stock [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
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%        
The Equity Plan [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]                        
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          
Vesting period   3 years                    
Restricted shares vested (in shares)                   4,880,544    
Restricted shares forfeited (in shares)                   136,400    
Postvesting restriction period   3 years                    
Discount for postvesting restrictions   15.00%                    
Unrecognized compensation cost related to unvested restricted shares     $ 8.3           $ 8.3 $ 8.3    
Compensation cost not yet recognized period for recognition     2 years                  
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) 14,945,000                      
Restricted stock, granted in period (in shares)     1,400,000 1,700,000                
Vesting period 3 years                      
Restricted shares vested (in shares)                 231,240      
Restricted shares forfeited (in shares)                 15,000   0  
Postvesting restriction period 3 years                      
Discount for postvesting restrictions 12.50%                      
Unrecognized compensation cost related to unvested restricted shares     $ 30.7           $ 30.7 $ 30.7    
Compensation cost not yet recognized period for recognition     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%