Notes Payable - Narrative (Details) - Notes payable - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Debt
Weighted average interest rate (as a percent)	3.70%		3.70%
Weighted average remaining years until maturity			6 years 7 months 6 days
Interest incurred on notes and bonds	$ 159.7	$ 107.9	$ 434.1	$ 314.0
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			150.00%