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NOTES PAYABLE – DIRECT CORPORATE OBLIGATIONS - NARRATIVE (Details) - USD ($)	May 08, 2025	Jun. 30, 2026	Dec. 31, 2025
Debt Instrument [Line Items]
Notes payable – direct corporate obligations		$ 1,336,300,000	$ 1,335,600,000
Credit Agreement \| Revolving Credit Agreement
Debt Instrument [Line Items]
Line of credit maximum borrowing capacity	$ 250,000,000.0
Total capitalization percentage	15.00%
Revolving Credit Facility \| Revolving Credit Agreement
Debt Instrument [Line Items]
Line of credit maximum borrowing capacity	$ 200,000,000
Debt covenant, required minimum debt to total capitalization ratio	35.00%
Debt covenant, actual debt to total capitalization ratio at period end		23.50%
Debt covenant, minimum required consolidated net worth, component one, amount	$ 2,674,000,000	$ 2,675,800,000
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		3,774,400,000
Notes payable – direct corporate obligations		$ 0
Revolving Credit Facility \| Revolving Credit Agreement \| Minimum \| SOFR
Debt Instrument [Line Items]
Basis spread on variable rate	1.125%
Revolving Credit Facility \| Revolving Credit Agreement \| Minimum \| Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate	0.125%
Revolving Credit Facility \| Revolving Credit Agreement \| Maximum \| SOFR
Debt Instrument [Line Items]
Basis spread on variable rate	1.75%
Revolving Credit Facility \| Revolving Credit Agreement \| Maximum \| Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate	0.75%