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NOTES PAYABLE - DIRECT CORPORATE OBLIGATIONS - NARRATIVE (Details) - USD ($)
 9 Months Ended
Sep. 30, 2025
May 08, 2025
Dec. 31, 2024
Debt Instrument [Line Items]      
Outstanding amount $ 1,335,200,000   $ 1,833,500,000
Line of Credit | Credit Agreement      
Debt Instrument [Line Items]      
Line of credit maximum borrowing capacity   $ 250,000,000.0  
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 24.00%    
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 $ 3,729,900,000    
Debt covenant, required minimum consolidated net worth, amount 2,674,300,000    
Incremental loans permitted by Credit Agreement   $ 200,000,000  
Outstanding amount $ 0    
Line of Credit | Credit Agreement | SOFR | Minimum      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.125%    
Line of Credit | Credit Agreement | SOFR | Maximum      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.75%    
Line of Credit | Credit Agreement | Base Rate | Minimum      
Debt Instrument [Line Items]      
Basis spread on variable rate 0.125%    
Line of Credit | Credit Agreement | Base Rate | Maximum      
Debt Instrument [Line Items]      
Basis spread on variable rate 0.75%