Summary of secured and unsecured senior debts (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2025 USD ($)
Debt Instrument [Line Items]
Fixed rate debt	$ 12,047,394
Variable-rate debt	353,161
Total Consolidated	$ 12,400,555
Percentage of Total	100.00%
Weighted Average Interest Rate at End of Period	3.91%
Weighted Average Remaining Terms (in years)	12 years 1 month 6 days
Percentage of fixed rate to total debt	97.20%
Percentage of variable-rate to total debt	2.80%
Unsecured senior notes
Debt Instrument [Line Items]
Fixed rate debt	$ 12,047,394
Variable-rate debt	0
Total Consolidated	$ 12,047,394
Percentage of Total	97.20%
Weighted Average Interest Rate at End of Period	3.90%
Weighted Average Remaining Terms (in years)	12 years 3 months 18 days
Unsecured senior line of credit
Debt Instrument [Line Items]
Total Consolidated	$ 0
Commercial paper program
Debt Instrument [Line Items]
Weighted Average Remaining Terms (in years)	12 years
Outstanding Balance	$ 353,200
Weighted-average yield to maturity, commercial paper	4.48%
Weighted-average remaining maturity term, commercial paper	19 days
Commercial paper program | Unsecured senior line of credit
Debt Instrument [Line Items]
Fixed rate debt	$ 0
Variable-rate debt	353,161
Total Consolidated	$ 353,161
Percentage of Total	2.80%
Weighted Average Interest Rate at End of Period	4.33%
Weighted Average Remaining Terms (in years)	4 years 1 month 6 days
Outstanding Balance	$ 353,500