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Secured Debt Arrangements, Net - Weighted Average Maturities and Interest Rates of Borrowings (Details) - Line of Credit € in Thousands, £ in Thousands, $ in Thousands, kr in Billions	Jun. 30, 2024 USD ($)	Jun. 30, 2024 GBP (£)	Jun. 30, 2024 EUR (€)	Jun. 30, 2024 SEK (kr)	Dec. 31, 2023 USD ($)	Dec. 31, 2023 GBP (£)	Dec. 31, 2023 EUR (€)	Dec. 31, 2023 SEK (kr)
Debt Instrument [Line Items]
Maximum amount of borrowings	$ 7,210,194				$ 6,998,758
Borrowings outstanding	5,628,925				5,538,476
Less: deferred financing costs	(10,751)				(13,333)
JP Morgan Chase, DB Repurchase Facility, Goldman Sachs, Credit Suisse and HSBC Facilities
Debt Instrument [Line Items]
Maximum amount of borrowings	4,946,633				4,459,633
Borrowings outstanding	3,529,115				3,247,652
JP Morgan Facility
Debt Instrument [Line Items]
Borrowings outstanding	1,033,532				1,061,380
JP Morgan Facility \| Amended and Restated JPMorgan Facility
Debt Instrument [Line Items]
Maximum amount of borrowings	1,500,000
Deutsche Bank Repurchase Facility
Debt Instrument [Line Items]
Borrowings outstanding	177,979				275,815
Credit Suisse Facility
Debt Instrument [Line Items]
Borrowings outstanding	756,416				669,302
HSBC Facility
Debt Instrument [Line Items]
Borrowings outstanding	654,462				665,368
Goldman Facility
Debt Instrument [Line Items]
Borrowings outstanding					13,437
Barclays Facility
Debt Instrument [Line Items]
Borrowings outstanding	353,153				107,929
MUFG Facility
Debt Instrument [Line Items]
Borrowings outstanding	203,308				204,690
Barclays Securitization
Debt Instrument [Line Items]
Borrowings outstanding	2,093,561	£ 1,000,000	€ 563,200	kr 2.0	2,157,157	£ 969,900	€ 655,800	kr 2.0
Churchill
Debt Instrument [Line Items]
Borrowings outstanding	123,902
JP Morgan Chase, DB Repurchase Facility, Goldman Sachs, Credit Suisse, Barclays Facility, HSBC Facilities And Barclays Securitization
Debt Instrument [Line Items]
Maximum amount of borrowings	7,210,194				6,998,758
Borrowings outstanding	5,639,676				5,551,809
USD
Debt Instrument [Line Items]
Maximum amount of borrowings	170,000				170,000
Borrowings outstanding	17,000				147,000
USD \| JP Morgan Facility
Debt Instrument [Line Items]
Maximum amount of borrowings	1,482,701				1,482,584
Borrowings outstanding	1,016,233				1,043,964
USD \| Deutsche Bank Repurchase Facility
Debt Instrument [Line Items]
Maximum amount of borrowings	700,000				700,000
Borrowings outstanding	177,979				275,815
USD \| Credit Suisse Facility
Debt Instrument [Line Items]
Maximum amount of borrowings	800,000				686,527
Borrowings outstanding	756,416				669,302
USD \| Goldman Facility
Debt Instrument [Line Items]
Maximum amount of borrowings	0				13,437
Borrowings outstanding	0				13,437
USD \| Barclays Facility
Debt Instrument [Line Items]
Maximum amount of borrowings	500,000				200,000
Borrowings outstanding	353,153				107,929
USD \| Santander Facility
Debt Instrument [Line Items]
Maximum amount of borrowings	300,000				300,000
Borrowings outstanding	67,500				67,500
USD \| Churchill
Debt Instrument [Line Items]
Maximum amount of borrowings	130,000				130,000
Borrowings outstanding	123,902				126,515
Fx contracts - GBP \| JP Morgan Facility
Debt Instrument [Line Items]
Maximum amount of borrowings \| £		17,299				17,416
Borrowings outstanding \| £		17,299				17,416
Fx contracts - GBP \| HSBC Facility
Debt Instrument [Line Items]
Maximum amount of borrowings \| £		381,373				383,967
Borrowings outstanding \| £		381,373				383,967
Fx contracts - GBP \| Goldman Facility
Debt Instrument [Line Items]
Maximum amount of borrowings \| £		158,863				0
Borrowings outstanding	158,863	158,863				0
Fx contracts - GBP \| MUFG Facility
Debt Instrument [Line Items]
Maximum amount of borrowings \| £		203,308				204,690
Borrowings outstanding \| £		£ 203,308				£ 204,690
Fx contracts - EUR \| HSBC Facility
Debt Instrument [Line Items]
Maximum amount of borrowings \| €			273,089				281,401
Borrowings outstanding \| €			€ 273,089				€ 281,401
Fx contracts - EUR \| Santander Facility
Debt Instrument [Line Items]
Maximum amount of borrowings	0				59,611
Borrowings outstanding	0				55,716
VIE \| Barclays Securitization
Debt Instrument [Line Items]
Maximum amount of borrowings	2,093,561				2,369,125
Borrowings outstanding	2,093,561				2,157,157
VIE \| Barclays Securitization \| Weighted Average
Debt Instrument [Line Items]
Borrowings outstanding	2,093,561				2,157,157
VIE \| Fx contracts - GBP \| Barclays Securitization \| Weighted Average
Debt Instrument [Line Items]
Borrowings outstanding	1,302,697				1,234,740
VIE \| Fx contracts - EUR \| Barclays Securitization \| Weighted Average
Debt Instrument [Line Items]
Borrowings outstanding	603,397				723,947
VIE \| SEK \| Barclays Securitization \| Weighted Average
Debt Instrument [Line Items]
Borrowings outstanding	$ 187,467				$ 198,470