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INDEBTEDNESS - Convertible Note Hedge and Warrant Transactions Narrative (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 12 Months Ended 61 Months Ended
Nov. 13, 2020
Mar. 05, 2020
May 25, 2018
Mar. 06, 2017
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2022
Convertible Debt              
Debt Instrument [Line Items]              
Conversion price of convertible debt (in USD per share)   $ 121.01 $ 77.85 $ 22.95      
Conversion price of convertible debt after effect of warrants and note hedge (in USD per share)   $ 161.34 $ 109.26 $ 31.18      
Convertible Debt | 2027 Convertible Notes              
Debt Instrument [Line Items]              
Conversion price of convertible debt (in USD per share) $ 299.13            
Conversion price of convertible debt after effect of warrants and note hedge (in USD per share) 414.18            
Convertible Debt | 2026 Convertible Notes              
Debt Instrument [Line Items]              
Conversion price of convertible debt (in USD per share) 299.13            
Conversion price of convertible debt after effect of warrants and note hedge (in USD per share) $ 368.16            
Common Stock Warrant, 2027 Notes              
Debt Instrument [Line Items]              
Warrants to purchase aggregate shares of capital stock (in shares) 1,900            
Warrants, weighted average exercise price (in USD per share) $ 414.18            
Proceeds from issuance of warrants $ 68.0            
Common Stock Warrant, 2026 Notes              
Debt Instrument [Line Items]              
Warrants to purchase aggregate shares of capital stock (in shares) 1,900            
Warrants, weighted average exercise price (in USD per share) $ 368.16            
Proceeds from issuance of warrants $ 64.6            
Common Stock Warrant, 2025 Notes              
Debt Instrument [Line Items]              
Warrants to purchase aggregate shares of capital stock (in shares)   8,260          
Warrants, weighted average exercise price (in USD per share)   $ 161.34          
Proceeds from issuance of warrants   $ 99.5          
Common Stock Warrant, 2023 Notes              
Debt Instrument [Line Items]              
Warrants to purchase aggregate shares of capital stock (in shares)     11,100        
Warrants, weighted average exercise price (in USD per share)     $ 109.26        
Proceeds from issuance of warrants     $ 112.1        
Shares of common stock received due to exercise of note hedges (in shares)           3,000  
Common Stock Warrant, 2022 Notes              
Debt Instrument [Line Items]              
Warrants to purchase aggregate shares of capital stock (in shares)       19,200      
Warrants, weighted average exercise price (in USD per share)       $ 31.18      
Proceeds from issuance of warrants       $ 57.2      
Shares of common stock received due to exercise of note hedges (in shares)         200   15,000
Options Held              
Debt Instrument [Line Items]              
Warrants to purchase aggregate shares of capital stock (in shares) 1,900 8,300 11,100 19,200      
Convertible note hedge, option to purchase common stock, price (in USD per share) $ 299.13 $ 121.01 $ 77.85 $ 22.95      
Cost of convertible note hedge   $ 149.2 $ 172.6 $ 92.1      
Options Held | 2027 Convertible Notes              
Debt Instrument [Line Items]              
Cost of convertible note hedge $ 104.3            
Options Held | 2026 Convertible Notes              
Debt Instrument [Line Items]              
Cost of convertible note hedge $ 84.6