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CONVERTIBLE NOTES - Additional information (Details)
$ / shares in Units, shares in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Feb. 29, 2020
USD ($)
Mar. 31, 2019
USD ($)
shares
Jun. 30, 2018
USD ($)
Jan. 31, 2018
USD ($)
Sep. 30, 2021
USD ($)
$ / shares
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
shares
$ / shares
Sep. 30, 2020
USD ($)
Dec. 31, 2020
Long-term debt                  
Net proceeds from issuance             $ 0 $ 1,125,547,000  
Repayments of debt in cash             0 150,054,000  
Loss on settlement of convertible notes $ 50,800,000 $ 187,700,000     $ 0 $ 0 $ 0 50,819,000  
Market price (in dollars per share) | $ / shares         $ 95.45   $ 95.45    
Convertible Notes                  
Long-term debt                  
Fixed interest rate (as a percent)       1.00%          
Net proceeds from issuance       $ 671,100,000          
Notes                  
Long-term debt                  
Amount issued and sold   $ 747,500,000              
Fixed interest rate (as a percent)   0.375%              
Net proceeds from issuance   $ 729,500,000              
Repurchase price, as percentage of principal amount, if company undergoes change of control             100    
January 2018 Notes                  
Long-term debt                  
Amount issued and sold       $ 690,000,000.0          
Fixed interest rate (as a percent)       1.00%          
June 2018 Notes                  
Long-term debt                  
Amount issued and sold     $ 218,500,000            
Fixed interest rate (as a percent)     1.00%            
Net proceeds from issuance     $ 225,300,000            
2025 notes                  
Long-term debt                  
Fixed interest rate (as a percent)         1.00%   1.00%   1.00%
Repayments of debt in cash 150,100,000                
Repayments of debt   493,400,000              
Amount used to pay off interest accrued 100,000 700,000              
Loss on settlement of convertible notes               $ 42,900,000  
Amount of debt extinguished 100,000,000.0                
Conversion rate, number of shares to be issued per $1,000 of principal amount (in shares)             0.1326    
Conversion price (in dollars per share) | $ / shares         $ 75.43   $ 75.43    
Convertible debt, if-converted (in shares) | shares             4.2    
If-converted value of debt in excess of principal amount             $ 83,600,000    
Effective interest rate (as a percent)         1.18% 1.18% 1.18% 1.21%  
Interest expense amortization term             3 years 3 months 18 days    
2027 Notes                  
Long-term debt                  
Fixed interest rate (as a percent)         0.375%   0.375%   0.375%
Repayments of debt in cash   $ 494,100,000              
Issuance of common stock upon convertible notes settlement (in shares) | shares   2.2              
Conversion of convertible securities, value issued   $ 182,400,000              
Total consideration   $ 676,500,000              
Conversion rate, number of shares to be issued per $1,000 of principal amount (in shares)             0.0896    
Conversion price (in dollars per share) | $ / shares         $ 111.66   $ 111.66    
Convertible debt, if-converted (in shares) | shares             6.7    
Effective interest rate (as a percent)         0.68% 0.68% 0.67% 0.68%  
Interest expense amortization term             5 years 5 months 15 days    
2028 Notes                  
Long-term debt                  
Amount issued and sold $ 1,150,000,000                
Fixed interest rate (as a percent) 0.375%       0.375%   0.375%   0.375%
Net proceeds from issuance $ 1,130,000,000                
Conversion rate, number of shares to be issued per $1,000 of principal amount (in shares)             0.0821    
Conversion price (in dollars per share) | $ / shares         $ 121.84   $ 121.84    
Convertible debt, if-converted (in shares) | shares             9.4    
Effective interest rate (as a percent)         0.64% 0.64% 0.64% 0.63%  
Interest expense amortization term             6 years 5 months 1 day