Notes Payable - Narrative (Details) - Notes payable - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Debt
Weighted average interest rate (as a percent)	3.80%
Weighted average remaining years until maturity (in years)	6 years 7 months 6 days
Interest incurred on notes and bonds	$ 840.3	$ 598.6	$ 431.3
Minimum
Debt
Debt service coverage ratio	1.5
Total unencumbered assets as a percentage of outstanding unsecured debt (as a percent)	150.00%
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%
Spirit Notes
Debt
Notes exchange, cash payment equal to basis points of note principal amount held	0.10%
Notes exchange, success rate (as a percent)	98.10%
Notes exchange, payments to participating shareholders	$ 2.7