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STOCK-BASED COMPENSATION - Narrative (Details)
3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2020
USD ($)
plan
installment
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award        
Number of active stock-based compensation plans | plan   1    
Shares available for grant (in shares) | shares 15,200,000 15,200,000    
Unrecognized compensation cost, net of estimated forfeitures $ 77,200,000 $ 77,200,000    
Weighted average period over which cost is expected to be recognized (in years)   2 years 2 months 12 days    
Tax benefit recognized related to stock-based compensation   $ 24,300,000 $ 28,800,000 $ 49,500,000
Intrinsic value of stock options exercised   $ 120,900,000 $ 107,500,000 $ 151,200,000
Stock options granted in period (shares) | shares 0 0 0 0
Incremental compensation cost from modification recognized in year of modification   $ 21,100,000 $ 29,000,000.0 $ 56,900,000
Incremental compensation cost from modification recognized in future period   900,000    
Accelerated cost       3,900,000
Cash received from stock option exercises   0 573,000 4,693,000
Cash remitted in stock issuance assuming conversion   $ (2,914,000) $ (12,768,000) (25,184,000)
Assumed withholding rate (as a percent)   50.00%    
Stock options outstanding (shares) | shares 10,689,000 10,689,000 23,984,000  
2017 Plan        
Share-based Compensation Arrangement by Share-based Payment Award        
Stated term (in years)   10 years    
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting period (in years)   4 years    
Tax benefit realized from stock option exercises   $ 11,400,000 $ 27,900,000 $ 40,200,000
Stock Appreciation Rights (SARs)        
Share-based Compensation Arrangement by Share-based Payment Award        
Accelerated cost $ 6,800,000      
Stock issued assuming conversion (shares) | shares   3,400,000    
Cash remitted in stock issuance assuming conversion   $ 45,200,000    
RSUs & Subsidiary Denominated Equity Instruments        
Share-based Compensation Arrangement by Share-based Payment Award        
Stock issued assuming conversion (shares) | shares   6,000,000.0    
Cash remitted in stock issuance assuming conversion   $ 76,800,000    
RSUs        
Share-based Compensation Arrangement by Share-based Payment Award        
Number of installments | installment   2    
Vesting rate (as a percent)   50.00%    
Accelerated cost $ 7,300,000      
Weighted average grant date fair value (USD per share) | $ / shares   $ 7.37 $ 13.16 $ 18.08
Equity units granted (shares) | shares   6,962,000    
Fair value of RSU's that vested during the period   $ 23,400,000 $ 16,100,000 $ 19,500,000
Vested (shares) | shares   2,128,000    
Subsidiary Denominated Equity Instruments        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting period (in years)   4 years    
MSUs        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting period (in years)   2 years    
Number of installments | installment   5    
Weighted average grant date fair value (USD per share) | $ / shares   $ 0 $ 3.67  
Equity units granted (shares) | shares   0   0
Fair value of RSU's that vested during the period   $ 5,200,000 $ 3,200,000  
Vested (shares) | shares   738,000    
PSUs        
Share-based Compensation Arrangement by Share-based Payment Award        
Weighted average grant date fair value (USD per share) | $ / shares   $ 6.92 $ 15.93  
Equity units granted (shares) | shares   1,844,000    
Vested (shares) | shares   0 0 0
Minimum | RSUs        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting period (in years)   3 years    
Minimum | PSUs        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting period (in years)   2 years    
Maximum | RSUs        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting period (in years)   4 years    
Maximum | PSUs        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting period (in years)   5 years