Notes and Bonds Payable - Changes in Debt Structure (Details) - USD ($)	1 Months Ended				12 Months Ended
	Oct. 31, 2025	Jul. 31, 2025	May 31, 2025	Jan. 31, 2025	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Oct. 07, 2025
Long Term Debt Maturities [Line Items]
Repayments of unsecured debt					$ 1,329,000,000	$ 1,289,000,000	$ 1,079,000,000
Accelerated amortization expense					500,000
Senior Notes due 2025 | Senior Notes
Long Term Debt Maturities [Line Items]
Amount of debt repaid			$ 250,000,000
Payment of accrued interest			4,800,000
Repayments of unsecured debt			$ 250,000,000
Term Loan due 2024 | Medium-Term Note
Long Term Debt Maturities [Line Items]
Repayments of unsecured debt	$ 151,400,000	$ 23,600,000		$ 25,000,000
Senior notes principal balance					200,000,000
$300 Million Unsecured Term Loan due January 2026
Long Term Debt Maturities [Line Items]
Repayments of unsecured debt					300,000,000
$300 Million Unsecured Term Loan due January 2026 | Medium-Term Note
Long Term Debt Maturities [Line Items]
Senior notes principal balance								$ 300,000,000
$200 Million Unsecured Loan due January 2026
Long Term Debt Maturities [Line Items]
Repayments of unsecured debt					200,000,000
$200 Million Unsecured Loan due January 2026 | Medium-Term Note
Long Term Debt Maturities [Line Items]
Senior notes principal balance								200,000,000
Unsecured Term Loan Due June 2026
Long Term Debt Maturities [Line Items]
Repayments of unsecured debt					$ 150,000,000
Unsecured Term Loan Due June 2026 | Medium-Term Note
Long Term Debt Maturities [Line Items]
Senior notes principal balance								$ 150,000,000