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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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NOTES PAYABLE - DIRECT CORPORATE OBLIGATIONS - NARRATIVE (Details) - USD ($)	May 13, 2024	Jul. 16, 2021	Sep. 30, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Outstanding amount			$ 1,832,900,000	$ 1,140,500,000
Senior Notes \| 6.450% Senior Notes due June 2034
Debt Instrument [Line Items]
Aggregate principal amount	$ 700,000,000
Interest rate	6.45%		6.45%
Debt default, percentage of principal amount outstanding	25.00%
Outstanding amount			$ 700,000,000.0	0
Senior Notes \| 6.450% Senior Notes due June 2034 \| Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Redemption price, percent	100.00%
Redemption day year	360 days
Redemption day month	30 days
Senior Notes \| 5.250% Senior Notes due May 2025
Debt Instrument [Line Items]
Interest rate			5.25%
Outstanding amount			$ 500,000,000.0	500,000,000.0
Senior Notes \| US Treasury (UST) Interest Rate \| 6.450% Senior Notes due June 2034
Debt Instrument [Line Items]
Discount rate used to determine redemption amount	0.30%
Line of Credit \| Revolving Credit Agreement
Debt Instrument [Line Items]
Outstanding amount			$ 0	$ 0
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			31.30%
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			$ 3,803,800,000
Debt covenant, required minimum consolidated net worth, amount			$ 2,698,100,000
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%