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TREASURY STOCK - Narrative (Details) - USD ($)
$ / shares in Units, shares in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Feb. 05, 2020
Jun. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 07, 2020
Equity, Class of Treasury Stock [Line Items]                    
Treasury stock (in shares) 4.9 4.9         4.9   4.9  
Treasury stock $ 234,500,000 $ 235,100,000         $ 234,500,000   $ 235,100,000  
Treasury stock, average cost per share (in dollars per share) $ 47.86 $ 47.86                
Stock repurchase program, authorized amount (up to)                   $ 225,000,000.0
Remaining amount under share repurchase $ 225,000,000.0           225,000,000.0      
Stock repurchased during period (in shares)     1.3 0.6         2.1  
Net proceeds from offering of convertible senior notes             $ 0 $ 575,000,000    
Accelerated share repurchase program, payment     $ 92,400,000              
Accelerated share repurchases, remaining share repurchases expected to be completed, value     $ 100,000,000.0              
Accelerated shares repurchased, amount         $ 0 $ 92,368,000        
Accelerated share repurchases, percentage of expected total repurchased     80.00%              
Convertible Debt                    
Equity, Class of Treasury Stock [Line Items]                    
Net proceeds from offering of convertible senior notes                 $ 100,000,000.0  
Convertible Debt | Certain Purchasers                    
Equity, Class of Treasury Stock [Line Items]                    
Net proceeds from offering of convertible senior notes                 $ 7,600,000