Debt - Additional Information (Details) € in Millions, £ in Millions, kr in Millions									3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 04, 2025 USD ($)	Jan. 06, 2025 USD ($) Swap	Sep. 16, 2024 USD ($) Swap	Jul. 03, 2024	Jun. 10, 2024 USD ($)	Apr. 01, 2024 USD ($) Swap	Mar. 04, 2024 USD ($)	Feb. 08, 2024 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)	Jun. 30, 2025 GBP (£)	Jun. 30, 2025 EUR (€)	Jun. 30, 2025 SEK (kr)	Mar. 31, 2025 USD ($)	Jan. 17, 2025 USD ($)	Dec. 31, 2024 GBP (£)	Dec. 31, 2024 EUR (€)	Dec. 31, 2024 SEK (kr)	Dec. 18, 2024 USD ($)	Sep. 30, 2024	Jun. 27, 2024 USD ($)	May 23, 2024 USD ($)	Apr. 08, 2024 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 01, 2023 USD ($)	Jul. 27, 2023 USD ($)	Apr. 27, 2023 USD ($)	Mar. 28, 2023 USD ($)	Feb. 28, 2023 USD ($)	Jan. 27, 2023 USD ($)	Jan. 18, 2023 USD ($)	Jan. 09, 2023 USD ($)	Dec. 31, 2022 USD ($)	Sep. 01, 2022 USD ($)
Debt Instrument [Line Items]
Asset coverage percentage									200.20%		200.20%		193.00%	200.20%	200.20%	200.20%			193.00%	193.00%	193.00%
Aggregate principal amount									$ 5,880,000,000		$ 5,880,000,000		$ 4,400,000,000
Line of credit facility maximum borrowing capacity																														$ 725,000,000
Shareholders' equity									4,212,253,000	$ 2,749,507,000	4,212,253,000	$ 2,749,507,000	4,036,470,000				$ 4,111,606,000										$ 2,380,563,000	$ 1,817,067,000
Notional amount of interest rate swap									2,100,000,000		2,100,000,000		1,350,000,000
2029 Notes
Debt Instrument [Line Items]
Aggregate principal amount					$ 150,000,000		$ 600,000,000		$ 750,000,000		$ 750,000,000		$ 750,000,000
Debt instrument, interest rate							6.50%		6.50%		6.50%		6.50%	6.50%	6.50%	6.50%			6.50%	6.50%	6.50%
Gain (loss) on fair value effective hedge											$ 15,700,000		$ (1,100,000)
Debt instrument, maturity date					Mar. 11, 2029		Mar. 11, 2029
Proceeds from issuance of debt, net of underwriting discount and offering costs					$ 147,800,000		$ 586,000,000
2029 Notes | SOFR
Debt Instrument [Line Items]
Debt instrument, description of variable rate basis											SOFR
January 2030 Notes
Debt Instrument [Line Items]
Aggregate principal amount			$ 600,000,000						$ 600,000,000		$ 600,000,000		$ 600,000,000
Debt instrument, interest rate			5.75%						5.75%		5.75%		5.75%	5.75%	5.75%	5.75%			5.75%	5.75%	5.75%
Gain (loss) on fair value effective hedge											$ (6,600,000)		$ (24,100,000)
Debt instrument, maturity date			Jan. 15, 2030
Derivative maturity date			Jan. 15, 2030
Proceeds from issuance of debt, net of underwriting discount and offering costs			$ 591,700,000
Notional amount of interest rate swap			$ 600,000,000
January 2030 Notes | SOFR
Debt Instrument [Line Items]
Debt Instrument, basis spread on variable rate											2.55%		2.55%
Debt instrument, description of variable rate basis											SOFR
July 2030 Notes
Debt Instrument [Line Items]
Aggregate principal amount		$ 750,000,000							$ 750,000,000		$ 750,000,000
Debt instrument, interest rate		6.125%							6.13%		6.13%			6.13%	6.13%	6.13%
Gain (loss) on fair value effective hedge											$ 22,400,000
Debt instrument, maturity date		Jul. 15, 2030
Derivative maturity date		Jul. 15, 2030
Proceeds from issuance of debt, net of underwriting discount and offering costs		$ 737,600,000
Notional amount of interest rate swap		$ 750,000,000
July 2030 Notes | SOFR
Debt Instrument [Line Items]
Debt Instrument, basis spread on variable rate		2.01%									2.01%
Debt instrument, description of variable rate basis		SOFR
2029 Notes, January 2030 Notes and July 2030 Note
Debt Instrument [Line Items]
Proceeds from settlements of interest rate swaps excluding upfront fees									$ 32,300,000	10,000,000	$ 62,300,000	11,500,000
Payments for settlements of interest rate swaps excluding upfront fees									35,800	$ 12,300,000	$ 68,000	$ 14,100,000
Interest Rate Swap | 2029 Notes
Debt Instrument [Line Items]
Number of derivative instruments held | Swap						2
Interest Rate Swap | January 2030 Notes
Debt Instrument [Line Items]
Number of derivative instruments held | Swap			1
Interest Rate Swap | July 2030 Notes
Debt Instrument [Line Items]
Number of derivative instruments held | Swap		1
Interest Rate Swap One | 2029 Notes
Debt Instrument [Line Items]
Derivative maturity date						Mar. 11, 2029
Notional amount of interest rate swap						$ 600,000,000
Interest Rate Swap Two | 2029 Notes
Debt Instrument [Line Items]
Derivative maturity date						Mar. 11, 2029
Notional amount of interest rate swap						$ 150,000,000
Weighted Average | 2029 Notes | SOFR
Debt Instrument [Line Items]
Debt Instrument, basis spread on variable rate											2.45%		2.45%
Subscription Facility
Debt Instrument [Line Items]
Aggregate principal amount									1,500,000,000		$ 1,500,000,000		$ 1,500,000,000
Line of credit facility maximum borrowing capacity																													$ 1,500,000,000		$ 1,350,000,000	$ 1,300,000,000		$ 850,000,000	$ 800,000,000		$ 700,000,000	$ 400,000,000
Line of credit facility, stated maturity date				Aug. 29, 2025
Line of credit, outstanding amount														£ 10.3	€ 7.3				£ 10.3	€ 7.3
Issuance of letters of credit									$ 0		$ 0		0
Line of credit facility, undrawn amount percentage											0.25%
Subscription Facility | Adjusted Daily SOFR
Debt Instrument [Line Items]
Debt Instrument, basis spread on variable rate											1.95%
Subscription Facility | Adjusted Term SOFR
Debt Instrument [Line Items]
Debt Instrument, basis spread on variable rate											1.95%
Subscription Facility | Prime Rate
Debt Instrument [Line Items]
Debt instrument, interest rate									0.95%		0.95%			0.95%	0.95%	0.95%
Subscription Facility | Federal Funds Rate
Debt Instrument [Line Items]
Debt Instrument, basis spread on variable rate											0.50%
Subscription Facility | Eurocurrency Rate
Debt Instrument [Line Items]
Debt Instrument, basis spread on variable rate											1.95%
Subscription Facility | SONIA
Debt Instrument [Line Items]
Interest amount											0.0326%
Debt Instrument, basis spread on variable rate											1.95%
Subscription Facility | Minimum | SOFR
Debt Instrument [Line Items]
Interest amount											0.10%
Subscription Facility | Maximum | SOFR
Debt Instrument [Line Items]
Interest amount											0.25%
Subscription Facility | Maximum | Adjusted Daily SOFR
Debt Instrument [Line Items]
Debt Instrument, basis spread on variable rate											1.00%
Revolving Credit Facility
Debt Instrument [Line Items]
Aggregate principal amount									$ 2,280,000,000		$ 2,280,000,000		1,550,000,000
Line of credit facility maximum borrowing capacity	$ 2,280,000,000							$ 1,000,000,000										$ 1,650,000,000				$ 1,550,000,000		$ 1,425,000,000	$ 1,375,000,000	$ 1,200,000,000							$ 700,000,000			$ 600,000,000
Line of credit facility maximum borrowing capacity under certain circumstances	$ 3,420,000,000																																			$ 1,000,000,000
Line of credit facility, stated maturity date	Mar. 04, 2030							Feb. 08, 2029
Line of credit, outstanding amount														£ 300.6	€ 899.7	kr 209.7			£ 299.2	€ 640.1	kr 80.2
Issuance of letters of credit									31,500,000		$ 31,500,000		$ 5,900,000
Line of credit facility, undrawn amount percentage											0.325%
Shareholders' equity									$ 2,400,000,000		$ 2,400,000,000
Percentage of net proceeds of sale of equity interests											25.00%
Debt instrument, maturity date							Mar. 04, 2030
Revolving Credit Facility | Minimum
Debt Instrument [Line Items]
Asset coverage ratio																							1
Revolving Credit Facility | Minimum | Adjusted Term SOFR
Debt Instrument [Line Items]
Debt Instrument, basis spread on variable rate											1.525%
Revolving Credit Facility | Minimum | Alternative Base Rate
Debt Instrument [Line Items]
Debt Instrument, basis spread on variable rate											0.525%
Revolving Credit Facility | Minimum | Specified Relevant Rate
Debt Instrument [Line Items]
Debt Instrument, basis spread on variable rate											0.525%
Revolving Credit Facility | Maximum
Debt Instrument [Line Items]
Asset coverage ratio									2		2			2	2	2
Revolving Credit Facility | Maximum | Adjusted Term SOFR
Debt Instrument [Line Items]
Debt Instrument, basis spread on variable rate											1.775%
Revolving Credit Facility | Maximum | Alternative Base Rate
Debt Instrument [Line Items]
Debt Instrument, basis spread on variable rate											0.775%
Revolving Credit Facility | Maximum | Specified Relevant Rate
Debt Instrument [Line Items]
Debt Instrument, basis spread on variable rate											1.775%
Revolving Credit Facility | Weighted Average | Adjusted Term SOFR
Debt Instrument [Line Items]
Debt Instrument, basis spread on variable rate											1.65%
Revolving Credit Facility | Weighted Average | Alternative Base Rate
Debt Instrument [Line Items]
Debt Instrument, basis spread on variable rate											0.65%
Revolving Credit Facility | Weighted Average | Specified Relevant Rate
Debt Instrument [Line Items]
Debt Instrument, basis spread on variable rate											0.65%
Letter of Credit
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity									$ 100,000,000		$ 100,000,000
Letter of Credit | Maximum
Debt Instrument [Line Items]
Percentage of commitment fee											10.00%
Incremental Term Loan
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity																						$ 50,000,000			$ 100,000,000