Debt and Foreign Currency Transactions and Translations - Additional Information (Details) € in Millions									6 Months Ended	13 Months Ended
	Sep. 01, 2024	Mar. 21, 2024 USD ($)	Dec. 09, 2022 USD ($)	Nov. 15, 2022 USD ($) Installment	Jun. 07, 2022 USD ($)	Apr. 07, 2022 USD ($)	Mar. 11, 2022 USD ($)	Jan. 07, 2022 USD ($)	Jun. 30, 2024 USD ($)	Aug. 31, 2024	Dec. 31, 2023 USD ($)	Oct. 12, 2023 USD ($)	Aug. 10, 2023 USD ($)	Aug. 10, 2023 EUR (€)
Debt Instrument [Line Items]
Asset coverage percentage									247.20%		255.30%
Principal amount outstanding									$ 5,532,386,000		$ 4,705,356,000
Minimum
Debt Instrument [Line Items]
Required assets coverage percentage									150.00%
Senior Secured Facility
Debt Instrument [Line Items]
Required assets coverage percentage									150.00%
Initiation date							Mar. 11, 2022
Maximum borrowing capacity					$ 2,085,000,000.000		$ 1,835,000,000					$ 2,185,000,000
Available facility to extended borrowing capacity under new or existing credit facility					$ 2,753,000,000		$ 2,753,000,000					$ 3,278,000,000
Maturity date					Mar. 11, 2027
Senior Secured Facility | Base Rate | Minimum
Debt Instrument [Line Items]
Debt instrument, spread on variable rate									0.75%
Senior Secured Facility | Base Rate | Maximum
Debt Instrument [Line Items]
Debt instrument, spread on variable rate									0.875%
Senior Secured Facility | SOFR | Minimum
Debt Instrument [Line Items]
Debt instrument, spread on variable rate									1.75%
Senior Secured Facility | SOFR | Maximum
Debt Instrument [Line Items]
Debt instrument, spread on variable rate									1.875%
Senior Secured Facility | SOFR Credit Spread Adjustment
Debt Instrument [Line Items]
Debt instrument, spread on variable rate									0.10%
Cardinal Funding Secured Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 800,000,000					$ 500,000,000	$ 500,000,000
Maturity date								Jan. 07, 2027
Debt instrument expiration reinvestment term									3 years
Debt additional aggregate commitment credit facility						$ 1,350,000,000		$ 750,000,000
Cardinal Funding Secured Credit Facility | Applicable Reference Rate
Debt Instrument [Line Items]
Debt instrument, basis spread prior to commitment termination date			2.75%
Debt instrument, basis spread after commitment termination date			3.25%
Cardinal Funding Secured Credit Facility | Applicable Reference Rate | Maximum
Debt Instrument [Line Items]
Debt instrument, spread on variable rate									0.50%
Mallard Funding Loan and Servicing Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity									$ 500,000,000
Maturity date								Jan. 07, 2027
Unsecured Notes | Interest Rate Swap
Debt Instrument [Line Items]
Derivatives fixed interest rate		6.90%
Unsecured Notes | SOFR | Interest Rate Swap
Debt Instrument [Line Items]
Principal amount outstanding		$ 325,000,000
Private Placement Bonds | Forecast
Debt Instrument [Line Items]
Percentage of minimum secured debt ratio	55.00%									60.00%
Private Placement Bonds | Senior Unsecured Notes
Debt Instrument [Line Items]
Number of installments on issuance of the notes | Installment				2
Frequency of periodic payments									semiannually
Private Placement Bonds | 2022 Series A Senior Unsecured Notes
Debt Instrument [Line Items]
Principal amount outstanding				$ 200,000,000
Private Placement Bonds | 2023 Series A Senior Unsecured Notes
Debt Instrument [Line Items]
Principal amount outstanding													$ 650,000,000
Broadly Syndicated Loans | Cardinal Funding Secured Credit Facility | SOFR Applicable Reference Rate
Debt Instrument [Line Items]
Debt instrument, spread on applicable referrence rate									1.70%
Broadly Syndicated Loans | Mallard Funding Loan and Servicing Agreement
Debt Instrument [Line Items]
Ramp up period									9 months
Broadly Syndicated Loans | Mallard Funding Loan and Servicing Agreement | Mallard Funding Applicable Reference Rate
Debt Instrument [Line Items]
Debt instrument, basis spread prior to commitment termination date									2.00%
Debt instrument, basis spread after commitment termination date									2.25%
Debt instrument, spread on variable rate									1.60%
Private Credit Loans | Cardinal Funding Secured Credit Facility | SOFR Applicable Reference Rate
Debt Instrument [Line Items]
Debt instrument, spread on variable rate									2.20%
Other Eligible Loans | Cardinal Funding Secured Credit Facility | SOFR Applicable Reference Rate
Debt Instrument [Line Items]
Debt instrument, spread on variable rate									2.45%
Financial Bonds | Cardinal Funding Secured Credit Facility | Applicable Reference Rate
Debt Instrument [Line Items]
Debt instrument, spread on variable rate						2.00%
Middle Market Loans | Mallard Funding Loan and Servicing Agreement | Mallard Funding Applicable Reference Rate
Debt Instrument [Line Items]
Debt instrument, basis spread prior to commitment termination date									2.00%
Debt instrument, basis spread after commitment termination date									2.25%
December 2025 Notes
Debt Instrument [Line Items]
Principal amount outstanding									$ 62,000,000		62,000,000
December 2025 Notes | Interest Rate Swap
Debt Instrument [Line Items]
Derivatives fixed interest rate				4.02%
December 2025 Notes | SOFR | Interest Rate Swap
Debt Instrument [Line Items]
Principal amount outstanding				$ 62,000,000
December 2025 Notes | Private Placement Bonds | Senior Unsecured Notes
Debt Instrument [Line Items]
Principal amount outstanding				$ 62,000,000
Notes due date				Dec. 21, 2025
January 2026 Notes
Debt Instrument [Line Items]
Principal amount outstanding									38,000,000		38,000,000
January 2026 Notes | Interest Rate Swap
Debt Instrument [Line Items]
Derivatives fixed interest rate				3.97%
January 2026 Notes | SOFR | Interest Rate Swap
Debt Instrument [Line Items]
Principal amount outstanding				$ 38,000,000
January 2026 Notes | Private Placement Bonds | Senior Unsecured Notes
Debt Instrument [Line Items]
Principal amount outstanding				$ 38,000,000
Notes due date				Jan. 19, 2026
December 2027 Notes
Debt Instrument [Line Items]
Principal amount outstanding									82,000,000		82,000,000
December 2027 Notes | Interest Rate Swap
Debt Instrument [Line Items]
Derivatives fixed interest rate				3.67%
December 2027 Notes | SOFR | Interest Rate Swap
Debt Instrument [Line Items]
Principal amount outstanding				$ 82,000,000
December 2027 Notes | Private Placement Bonds | Senior Unsecured Notes
Debt Instrument [Line Items]
Principal amount outstanding				$ 82,000,000
Notes due date				Dec. 21, 2027
January 2028 Notes
Debt Instrument [Line Items]
Principal amount outstanding									18,000,000		18,000,000
January 2028 Notes | Interest Rate Swap
Debt Instrument [Line Items]
Derivatives fixed interest rate				3.65%
January 2028 Notes | SOFR | Interest Rate Swap
Debt Instrument [Line Items]
Principal amount outstanding				$ 18,000,000
January 2028 Notes | Private Placement Bonds | Senior Unsecured Notes
Debt Instrument [Line Items]
Principal amount outstanding				$ 18,000,000
Notes due date				Jan. 19, 2028
September 2026 Notes
Debt Instrument [Line Items]
Principal amount outstanding									226,000,000		$ 226,000,000
September 2026 Notes | Private Placement Bonds | 2023 Series A Senior Unsecured Notes
Debt Instrument [Line Items]
Principal amount outstanding													$ 226,000,000
Unsecured Notes Due 2025 | Private Placement Bonds | Senior Unsecured Notes
Debt Instrument [Line Items]
Fixed interest rate				8.21%
Unsecured Notes Due 2026 | Interest Rate Swap
Debt Instrument [Line Items]
Derivatives fixed interest rate													8.54%	8.54%
Unsecured Notes Due 2026 | SOFR | Interest Rate Swap
Debt Instrument [Line Items]
Principal amount outstanding													$ 226,000,000
Derivatives fixed interest rate													4.18%	4.18%
Unsecured Notes Due 2026 | Private Placement Bonds
Debt Instrument [Line Items]
Fixed interest rate													8.54%	8.54%
Unsecured Notes Due 2026 | Private Placement Bonds | Senior Unsecured Notes
Debt Instrument [Line Items]
Fixed interest rate				8.21%
Unsecured Notes Due 2027 | Private Placement Bonds | Senior Unsecured Notes
Debt Instrument [Line Items]
Fixed interest rate				8.31%
Unsecured Notes Due 2028 | Interest Rate Swap
Debt Instrument [Line Items]
Derivatives fixed interest rate													8.62%	8.62%
Unsecured Notes Due 2028 | SOFR | Interest Rate Swap
Debt Instrument [Line Items]
Principal amount outstanding													$ 325,000,000
Variable interest rate													4.56%	4.56%
Unsecured Notes Due 2028 | Private Placement Bonds
Debt Instrument [Line Items]
Fixed interest rate													8.62%	8.62%
Unsecured Notes Due 2028 | Private Placement Bonds | Senior Unsecured Notes
Debt Instrument [Line Items]
Fixed interest rate				8.31%
Unsecured Notes Due 2028 | Private Placement Bonds | Senior Unsecured Notes | Maximum
Debt Instrument [Line Items]
Debt instrument increase in interest rate				1.00%
Unsecured Notes Due 2028 | Private Placement Bonds | 2023 Series A Senior Unsecured Notes
Debt Instrument [Line Items]
Principal amount outstanding													$ 325,000,000
Euro 2026 Notes | Interest Rate Swap
Debt Instrument [Line Items]
Derivatives fixed interest rate													7.02%	7.02%
Euro 2026 Notes | ESTR | Interest Rate Swap
Debt Instrument [Line Items]
Principal amount outstanding | €														€ 90
Variable interest rate													3.72%	3.72%
Euro 2026 Notes | Private Placement Bonds
Debt Instrument [Line Items]
Fixed interest rate													7.02%	7.02%
Euro 2026 Notes | Private Placement Bonds | Senior Unsecured Notes | Maximum | Redemption Period One
Debt Instrument [Line Items]
Debt instrument potential increase in interest rate													1.00%	1.00%
Euro 2026 Notes | Private Placement Bonds | Senior Unsecured Notes | Maximum | Redemption Period Two
Debt Instrument [Line Items]
Debt instrument potential increase in interest rate													1.50%	1.50%
Euro 2026 Notes | Private Placement Bonds | Senior Unsecured Notes | Maximum | Redemption Period Three
Debt Instrument [Line Items]
Debt instrument increase in interest rate													2.00%	2.00%
Euro 2026 Notes | Private Placement Bonds | 2023 Series A Senior Unsecured Notes
Debt Instrument [Line Items]
Principal amount outstanding | €														€ 90
2029 Notes
Debt Instrument [Line Items]
Principal amount outstanding									$ 650,000,000
2029 Notes | Unsecured Notes
Debt Instrument [Line Items]
Principal amount outstanding		$ 650,000,000
Fixed interest rate		6.90%
Notes due date		Apr. 13, 2029
Frequency of periodic payments									semi-annually