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TREASURY STOCK - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Feb. 05, 2020
Jun. 30, 2020
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Dec. 11, 2018
Equity, Class of Treasury Stock [Line Items]            
Treasury stock (in shares)     4,300,000   2,900,000  
Treasury stock     $ 202,500,000   $ 119,900,000  
Treasury stock, average cost per share (in dollars per share)     $ 47.17   $ 41.87  
Stock repurchase program, authorized amount (up to)           $ 225,000,000.0
Stock repurchased during period (in shares) 1,300,000   1,400,000      
Net proceeds from offering of convertible senior notes     $ 575,000,000 $ 0    
Accelerated share repurchase program, payment $ 92,400,000          
Accelerated shares repurchased, amount $ 100,000,000.0   92,368,000      
Accelerated share repurchases, percentage of expected total repurchased 80.00%          
Remaining amount under share repurchase     125,000,000.0      
Forecast | Subsequent Event            
Equity, Class of Treasury Stock [Line Items]            
Accelerated share repurchases, percentage of expected total repurchased   20.00%        
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