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FINANCING ACTIVITIES AND OFF-BALANCE SHEET RISK - NARRATIVE (Details)
1 Months Ended 6 Months Ended
Apr. 30, 2021
USD ($)
Feb. 28, 2021
USD ($)
tranche
$ / shares
Oct. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Oct. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]                  
Settlement date basis, equities         2 days        
Settlement date basis, options         1 day        
Tranche 1 Convertible Note Holders                  
Debt Instrument [Line Items]                  
Aggregate proceeds invested, percentage   15.00%              
Maximum amount of all warrants   $ 379,800,000              
Common Class A | Tranche 1 Convertible Note Holders                  
Debt Instrument [Line Items]                  
Conversion price percentage, warrant   70.00%              
Exercise price (in dollars per share) | $ / shares   $ 38.29              
Preferred Stock | Tranche 1 Convertible Note Holders                  
Debt Instrument [Line Items]                  
Conversion price percentage, warrant   70.00%              
Exercise price (in dollars per share) | $ / shares   $ 38.29              
Outstanding warrants strike price (in dollars per share) | $ / shares   $ 18.60              
Convertible notes                  
Debt Instrument [Line Items]                  
Number of tranches issued | tranche   2              
Interest rate on loan   6.00%              
Convertible notes | Common Class A                  
Debt Instrument [Line Items]                  
Gross proceeds from IPO offering to trigger convesion   $ 500,000,000              
Conversion price percentage, convertible debt   70.00%              
Convertible notes | Preferred Stock                  
Debt Instrument [Line Items]                  
Gross proceeds from IPO offering to trigger convesion   $ 500,000,000              
Conversion price percentage, convertible debt   70.00%              
Tranche I Convertible Notes | Convertible notes                  
Debt Instrument [Line Items]                  
Notes issued   $ 2,530,000,000              
Tranche I Convertible Notes | Convertible notes | Common Class A                  
Debt Instrument [Line Items]                  
Conversion price (in dollars per share) | $ / shares   $ 38.29              
Tranche I Convertible Notes | Convertible notes | Preferred Stock                  
Debt Instrument [Line Items]                  
Conversion price (in dollars per share) | $ / shares   $ 38.29              
Tranche II Convertible Notes | Convertible notes                  
Debt Instrument [Line Items]                  
Notes issued   $ 1,020,000,000.00              
Tranche II Convertible Notes | Convertible notes | Common Class A                  
Debt Instrument [Line Items]                  
Conversion price (in dollars per share) | $ / shares   $ 42.12              
Tranche II Convertible Notes | Convertible notes | Preferred Stock                  
Debt Instrument [Line Items]                  
Conversion price (in dollars per share) | $ / shares   $ 42.12              
Revolving Credit Facility | October 2019 Credit Facility | Line of Credit                  
Debt Instrument [Line Items]                  
Line of credit facility, amount entered into     $ 200,000,000            
Commitment fee percentage     0.10%            
Outstanding borrowings, long-term         $ 0 $ 0     $ 0
Revolving Credit Facility | October 2019 Credit Facility | Eurodollar | Line of Credit                  
Debt Instrument [Line Items]                  
Variable rate on loan     1.00%            
Revolving Credit Facility | October 2019 Credit Facility | Federal Reserve Bank of New York Rate | Line of Credit                  
Debt Instrument [Line Items]                  
Variable rate on loan     0.50%            
Revolving Credit Facility | October 2019 Credit Facility | Eurodollar, One Month Interest Period | Line of Credit                  
Debt Instrument [Line Items]                  
Variable rate on loan     1.00%            
Revolving Credit Facility | October 2019 Credit Facility, As Amended | Line of Credit                  
Debt Instrument [Line Items]                  
Line of credit facility, amount entered into $ 625,000,000           $ 600,000,000    
Revolving Credit Facility | Line of Credit | September 2019 Credit Facility                  
Debt Instrument [Line Items]                  
Line of credit facility, amount entered into       $ 400,000,000          
Outstanding borrowings, short-term           $ 0     $ 0
Commitment fee percentage       0.35%          
Revolving Credit Facility | Line of Credit | September 2019 Credit Facility | Federal Funds Rate                  
Debt Instrument [Line Items]                  
Variable rate on loan       1.25%          
Revolving Credit Facility | Line of Credit | September 2019 Credit Facility, As Amended                  
Debt Instrument [Line Items]                  
Line of credit facility, amount entered into               $ 550,000,000  
Revolving Credit Facility | Line of Credit | April 2021 Credit Facility                  
Debt Instrument [Line Items]                  
Line of credit facility, amount entered into $ 2,200,000,000                
Outstanding borrowings, short-term         $ 0        
Commitment fee percentage 0.50%                
Revolving Credit Facility | Line of Credit | April 2021 Credit Facility, Tranche A | Short-Term Funding Rate                  
Debt Instrument [Line Items]                  
Variable rate on loan 1.25%                
Revolving Credit Facility | Line of Credit | April 2021 Credit Facility, Tranche B and C | Short-Term Funding Rate                  
Debt Instrument [Line Items]                  
Variable rate on loan 2.50%