Notes Payable - Narrative (Details) - Notes Payable to Banks - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Debt
Weighted average interest rate (as a percent)	3.80%
Weighted average remaining years until maturity (in years)	6 years 3 months 18 days
Interest incurred on notes and bonds	$ 219.9	$ 200.5
Maximum
Debt
Debt to total adjusted assets ratio (as a percent)	60.00%
Secured debt to total adjusted assets ratio (as a percent)	40.00%
Minimum
Debt
Debt service coverage ratio	1.5
Total unencumbered assets as a percentage of outstanding unsecured debt (as a percent)	150.00%