Term Loans (Details) $ in Thousands, € in Millions, £ in Millions	1 Months Ended		3 Months Ended	6 Months Ended
	Mar. 31, 2026 USD ($)	Mar. 31, 2026 EUR (€)	Jun. 30, 2026 USD ($) extension_option	Jun. 30, 2026 USD ($) extension_option	Jun. 30, 2025 USD ($)	Jun. 30, 2026 GBP (£) extension_option	Dec. 31, 2025 USD ($)
Debt
Proceeds from issuance of unsecured debt				$ 1,073,900	$ 0
4.91% Unsecured Term Loan Due January 2036 | Cross-currency swaps
Debt
Proceeds from issuance of unsecured debt	$ 500,000	€ 431.0
Fund Credit Facilities
Debt
Maximum borrowing capacity			$ 1,380,000	1,380,000
Unsecured Debt
Debt
Deferred finance costs balance			14,500	14,500			$ 9,400
Unsecured Debt | 4.91% Unsecured Term Loan Due January 2036
Debt
Face amount of loan	$ 693,900
Stated interest rate (as a percent)	4.90%
Combined blended interest rate (as a percent)	4.34%
Outstanding debt balance			703,000	$ 703,000
Unsecured Debt | Fund Credit Facilities
Debt
Proceeds from issuance of unsecured debt			$ 380,000
Number of extension options | extension_option			4	4		4
Extension period			6 months
Unsecured Debt | Fund Credit Facilities | Interest rate swaps
Debt
Derivative, fixed interest rate (as a percent)			4.92%	4.92%		4.92%
Unsecured Debt | Sterling-Denominated Term Loan Facility
Debt
Face amount of loan | £						£ 900.0
Outstanding debt balance			$ 1,200,000	$ 1,200,000
Number of extension options | extension_option			1	1		1
Extension period				12 months
Basis spread on variable rate (as a percent)				0.80%
Debt term				2 years
Unsecured Debt | Sterling-Denominated Term Loan Facility | Variable to fixed interest rate swap
Debt
Derivative, fixed interest rate (as a percent)			4.30%	4.30%		4.30%
Unsecured Debt | $500 Million Term Loan Agreement Due August 2027
Debt
Outstanding debt balance			$ 500,000	$ 500,000
Unsecured Debt | $500 Million Term Loan Agreement Due August 2027 | Interest rate swaps
Debt
Derivative, fixed interest rate (as a percent)			3.30%	3.30%		3.30%