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NOTES PAYABLE - DIRECT CORPORATE OBLIGATIONS - NARRATIVE (Details) - USD ($)
Jul. 16, 2021
Sep. 30, 2023
Dec. 31, 2022
Debt Instrument [Line Items]      
Outstanding amount   $ 1,140,100,000 $ 1,138,800,000
Line of Credit | Revolving Credit Agreement      
Debt Instrument [Line Items]      
Line of credit maximum borrowing capacity $ 250,000,000    
Total capitalization percentage 15.00%    
Debt covenant, required minimum debt to total capitalization ratio 35.00%    
Debt covenant, actual debt to total capitalization ratio at period end   21.50%  
Debt covenant, minimum required consolidated net worth, component one, amount $ 2,674,000,000    
Debt covenant, minimum required consolidated net worth, component two, as a percent of net equity proceeds received from issuance and sale of equity interests 25.00%    
Debt covenant, actual consolidated net worth at period end   $ 3,846,800,000  
Debt covenant, required minimum consolidated net worth, amount   2,696,500,000  
Outstanding amount   $ 0 $ 0
Line of Credit | Revolving Credit Agreement | SOFR | Minimum      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.375%    
Line of Credit | Revolving Credit Agreement | SOFR | Maximum      
Debt Instrument [Line Items]      
Basis spread on variable rate 2.125%    
Line of Credit | Revolving Credit Agreement | Base Rate | Minimum      
Debt Instrument [Line Items]      
Basis spread on variable rate 0.375%    
Line of Credit | Revolving Credit Agreement | Base Rate | Maximum      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.125%    
Line of Credit | Revolving Credit Agreement | Credit Spread Adjustment (SOFR)      
Debt Instrument [Line Items]      
Basis spread on variable rate 0.10%