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Secured Debt Arrangements, Net - Weighted Average Maturities and Interest Rates of Borrowings (Details) kr in Thousands, € in Millions, £ in Millions | 9 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) | Sep. 30, 2023 SEK (kr) | Sep. 30, 2023 GBP (£) | Sep. 30, 2023 EUR (€) | Jan. 31, 2023 USD ($) | Dec. 31, 2022 SEK (kr) | Dec. 31, 2022 GBP (£) | Dec. 31, 2022 EUR (€) | Aug. 31, 2022 USD ($) | Jul. 31, 2022 USD ($) | Nov. 30, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, amortization period | 2 years |  |  |  |  |  |  |  |  |  |  |
Percentage of secured debt that is recourse debt | 58.00% | 58.00% | 58.00% | 58.00% | 58.00% |  | 58.00% | 58.00% | 58.00% |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount of borrowings | $ 6,698,640,000 | $ 6,175,121,000 |  |  |  |  |  |  |  |  |  |
Borrowings outstanding | 5,135,855,000 | 5,296,825,000 |  |  |  |  |  |  |  |  |  |
Less: deferred financing costs | $ (11,572,000) | $ (12,477,000) |  |  |  |  |  |  |  |  |  |
Line of Credit | Weighted Average |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Weighted average advance rate | 68.70% | 68.80% |  |  |  |  |  |  |  |  |  |
Line of Credit | Secured Overnight Financing Rate (SOFR) | Weighted Average |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Weighted average rate | 2.45% | 2.28% |  |  |  |  |  |  |  |  |  |
Line of Credit | GBP London Interbank Offered Rate (LIBOR) | Weighted Average |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Weighted average rate | 1.99% | 2.02% |  |  |  |  |  |  |  |  |  |
Line of Credit | EUR London Interbank Offered Rate (LIBOR) | Weighted Average |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Weighted average rate | 1.65% | 1.54% |  |  |  |  |  |  |  |  |  |
Line of Credit | SEK London Interbank Offered Rate (LIBOR) | Weighted Average |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Weighted average rate | 1.50% | 1.50% |  |  |  |  |  |  |  |  |  |
Line of Credit | JP Morgan Chase, DB Repurchase Facility, Goldman Sachs, Credit Suisse and HSBC Facilities |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount of borrowings | $ 4,710,441,000 | $ 4,325,045,000 |  |  |  |  |  |  |  |  |  |
Borrowings outstanding | 3,329,228,000 | 3,459,226,000 |  |  |  |  |  |  |  |  |  |
Line of Credit | JP Morgan Facility | Amended and Restated JPMorgan Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount of borrowings |  |  |  |  |  | $ 1,500,000,000 |  |  |  | $ 1,600,000,000 | $ 1,500,000,000 | $ 1,500,000,000
Line of Credit | Barclays Securitization |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings outstanding |  |  | kr 2,100,000 | £ 913.8 | € 486.5 |  | kr 2,100,000 | £ 931.4 | € 491.6 |  |  |
Line of Credit | 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 | 6,698,640,000 | 6,175,121,000 |  |  |  |  |  |  |  |  |  |
Borrowings outstanding | 5,147,427,000 | 5,309,302,000 |  |  |  |  |  |  |  |  |  |
USD | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount of borrowings | 170,000,000 | 0 |  |  |  |  |  |  |  |  |  |
Borrowings outstanding | $ 0 | $ 0 |  |  |  |  |  |  |  |  |  |
USD | Line of Credit | Weighted Average |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Weighted average advance rate | 65.00% | 63.90% |  |  |  |  |  |  |  |  |  |
USD | Line of Credit | JP Morgan Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount of borrowings | $ 1,483,312,000 | $ 1,532,722,000 |  |  |  |  |  |  |  |  |  |
Borrowings outstanding | 1,155,531,000 | 1,306,320,000 |  |  |  |  |  |  |  |  |  |
USD | Line of Credit | Deutsche Bank Repurchase Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount of borrowings | 700,000,000 | 700,000,000 |  |  |  |  |  |  |  |  |  |
Borrowings outstanding | 275,815,000 | 385,818,000 |  |  |  |  |  |  |  |  |  |
USD | Line of Credit | Credit Suisse Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount of borrowings | 689,770,000 | 635,653,000 |  |  |  |  |  |  |  |  |  |
Borrowings outstanding | 663,817,000 | 632,747,000 |  |  |  |  |  |  |  |  |  |
USD | Line of Credit | Goldman Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount of borrowings | 300,000,000 | 300,000,000 |  |  |  |  |  |  |  |  |  |
Borrowings outstanding | 17,868,000 | 70,249,000 |  |  |  |  |  |  |  |  |  |
USD | Line of Credit | Barclays Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount of borrowings | 200,000,000 | 200,000,000 |  |  |  |  |  |  |  |  |  |
Borrowings outstanding | 109,843,000 | 111,909,000 |  |  |  |  |  |  |  |  |  |
USD | Line of Credit | Santander Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount of borrowings | 300,000,000 | 0 |  |  |  |  |  |  |  |  |  |
Borrowings outstanding | 75,000,000 | 0 |  |  |  |  |  |  |  |  |  |
USD | Line of Credit | Churchill |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount of borrowings | 130,000,000 | 0 |  |  |  |  |  |  |  |  |  |
Borrowings outstanding | $ 127,822,000 | $ 0 |  |  |  |  |  |  |  |  |  |
Fx contracts - GBP | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Currency conversion rate | 1.22 | 1.21 | 1.22 | 1.22 | 1.22 |  | 1.21 | 1.21 | 1.21 |  |  |
Fx contracts - GBP | Line of Credit | Weighted Average |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Weighted average advance rate | 72.10% | 74.00% |  |  |  |  |  |  |  |  |  |
Fx contracts - GBP | Line of Credit | JP Morgan Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount of borrowings | $ 16,688,000 | $ 67,278,000 |  |  |  |  |  |  |  |  |  |
Borrowings outstanding | 16,688,000 | 67,278,000 |  |  |  |  |  |  |  |  |  |
Fx contracts - GBP | Line of Credit | HSBC Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount of borrowings | 367,922,000 | 364,423,000 |  |  |  |  |  |  |  |  |  |
Borrowings outstanding | 367,922,000 | 364,423,000 |  |  |  |  |  |  |  |  |  |
Fx contracts - GBP | Line of Credit | MUFG Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount of borrowings | 196,137,000 | 194,272,000 |  |  |  |  |  |  |  |  |  |
Borrowings outstanding | $ 196,137,000 | $ 194,272,000 |  |  |  |  |  |  |  |  |  |
Fx contracts - EUR | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Currency conversion rate | 1.06 | 1.07 | 1.06 | 1.06 | 1.06 |  | 1.07 | 1.07 | 1.07 |  |  |
Fx contracts - EUR | Line of Credit | Weighted Average |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Weighted average advance rate | 71.60% | 72.10% |  |  |  |  |  |  |  |  |  |
Fx contracts - EUR | Line of Credit | HSBC Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount of borrowings | $ 269,518,000 | $ 272,890,000 |  |  |  |  |  |  |  |  |  |
Borrowings outstanding | 269,518,000 | 272,890,000 |  |  |  |  |  |  |  |  |  |
Fx contracts - EUR | Line of Credit | Santander Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount of borrowings | 57,094,000 | 57,807,000 |  |  |  |  |  |  |  |  |  |
Borrowings outstanding | $ 53,267,000 | $ 53,320,000 |  |  |  |  |  |  |  |  |  |
SEK | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Currency conversion rate | 0.09 | 0.10 | 0.09 | 0.09 | 0.09 |  | 0.10 | 0.10 | 0.10 |  |  |
SEK | Line of Credit | Weighted Average |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Weighted average advance rate | 80.40% | 80.50% |  |  |  |  |  |  |  |  |  |
VIE | Line of Credit | Barclays Securitization |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount of borrowings | $ 1,818,199,000 | $ 1,850,076,000 |  |  |  |  |  |  |  |  |  |
Borrowings outstanding | 1,818,199,000 | 1,850,076,000 |  |  |  |  |  |  |  |  |  |
VIE | Line of Credit | Barclays Securitization | Weighted Average |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings outstanding | 1,818,199,000 | 1,850,076,000 |  |  |  |  |  |  |  |  |  |
VIE | Fx contracts - GBP | Line of Credit | Barclays Securitization | Weighted Average |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings outstanding | 1,114,701,000 | 1,125,420,000 |  |  |  |  |  |  |  |  |  |
VIE | Fx contracts - EUR | Line of Credit | Barclays Securitization | Weighted Average |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings outstanding | $ 514,393,000 | $ 526,204,000 |  |  |  |  |  |  |  |  |  |
VIE | SEK | Line of Credit | Barclays Securitization | Weighted Average |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings outstanding | kr |  |  | kr 189,105 |  |  |  | kr 198,452 |  |  |  |  |

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