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Secured Debt Arrangements, Net - Weighted Average Maturities and Interest Rates of Borrowings (Details) kr in Thousands, € in Millions, £ in Millions | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Mar. 31, 2024 SEK (kr) | Mar. 31, 2024 GBP (£) | Mar. 31, 2024 EUR (€) | Dec. 31, 2023 SEK (kr) | Dec. 31, 2023 GBP (£) | Dec. 31, 2023 EUR (€) | Nov. 30, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, extension term | 2 years |  |  |  |  |  |  |  |
Debt instrument, amortization period | 2 years |  |  |  |  |  |  |  |
Debt instrument, extended maturity period | 2 years |  |  |  |  |  |  |  |
Percentage of secured debt that is recourse debt | 52.20% | 58.30% | 52.20% | 52.20% | 52.20% | 58.30% | 58.30% | 58.30% |
Line of Credit |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum amount of borrowings | $ 6,943,566,000 | $ 6,998,758,000 |  |  |  |  |  |  |
Borrowings outstanding | 5,596,967,000 | 5,538,476,000 |  |  |  |  |  |  |
Less: deferred financing costs | $ (13,524,000) | $ (13,333,000) |  |  |  |  |  |  |
Line of Credit | Weighted Average |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Weighted average advance rate | 68.10% | 68.40% |  |  |  |  |  |  |
Line of Credit | Secured Overnight Financing Rate (SOFR) | Weighted Average |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Weighted average rate | 2.64% | 2.49% |  |  |  |  |  |  |
Line of Credit | GBP London Interbank Offered Rate (LIBOR) | Weighted Average |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Weighted average rate | 2.25% | 2.21% |  |  |  |  |  |  |
Line of Credit | EUR London Interbank Offered Rate (LIBOR) | Weighted Average |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Weighted average rate | 1.86% | 1.86% |  |  |  |  |  |  |
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 | $ 4,717,202,000 | $ 4,459,633,000 |  |  |  |  |  |  |
Borrowings outstanding | $ 3,460,127,000 | $ 3,247,652,000 |  |  |  |  |  |  |
Line of Credit | JP Morgan Facility | Amended and Restated JPMorgan Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum amount of borrowings |  |  |  |  |  |  |  |  | $ 1,500,000,000
Line of Credit | Credit Suisse Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt interest rate cap | 2 years | 6 months |  |  |  |  |  |  |
Debt instrument, extension term | 1 year |  |  |  |  |  |  |  |
Line of Credit | Goldman Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum amount of borrowings | $ 158,600,000 |  |  |  |  |  |  |  |
Line of Credit | Barclays Securitization |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Borrowings outstanding |  |  | kr 2,000,000 | £ 998.9 | € 565.0 | kr 2,000,000 | £ 969.9 | € 655.8 |
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 | 6,943,566,000 | $ 6,998,758,000 |  |  |  |  |  |  |
Borrowings outstanding | 5,610,491,000 | 5,551,809,000 |  |  |  |  |  |  |
USD | Line of Credit |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum amount of borrowings | 170,000,000 | 170,000,000 |  |  |  |  |  |  |
Borrowings outstanding | $ 94,000,000 | $ 147,000,000 |  |  |  |  |  |  |
USD | Line of Credit | Weighted Average |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Weighted average advance rate | 62.40% | 62.90% |  |  |  |  |  |  |
USD | Line of Credit | JP Morgan Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum amount of borrowings | $ 1,482,730,000 | $ 1,482,584,000 |  |  |  |  |  |  |
Borrowings outstanding | 1,036,803,000 | 1,043,964,000 |  |  |  |  |  |  |
USD | Line of Credit | Deutsche Bank Repurchase Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum amount of borrowings | 700,000,000 | 700,000,000 |  |  |  |  |  |  |
Borrowings outstanding | 278,703,000 | 275,815,000 |  |  |  |  |  |  |
USD | Line of Credit | Credit Suisse Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum amount of borrowings | 800,000,000 | 686,527,000 |  |  |  |  |  |  |
Borrowings outstanding | 751,207,000 | 669,302,000 |  |  |  |  |  |  |
USD | Line of Credit | Goldman Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum amount of borrowings | 11,605,000 | 13,437,000 |  |  |  |  |  |  |
Borrowings outstanding | 11,605,000 | 13,437,000 |  |  |  |  |  |  |
USD | Line of Credit | Barclays Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum amount of borrowings | 200,000,000 | 200,000,000 |  |  |  |  |  |  |
Borrowings outstanding | 99,817,000 | 107,929,000 |  |  |  |  |  |  |
USD | Line of Credit | Santander Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum amount of borrowings | 300,000,000 | 300,000,000 |  |  |  |  |  |  |
Borrowings outstanding | 67,500,000 | 67,500,000 |  |  |  |  |  |  |
USD | Line of Credit | Churchill |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum amount of borrowings | 130,000,000 | 130,000,000 |  |  |  |  |  |  |
Borrowings outstanding | $ 125,209,000 | $ 126,515,000 |  |  |  |  |  |  |
Fx contracts - GBP | Line of Credit |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Currency conversion rate | 1.26 | 1.27 | 1.26 | 1.26 | 1.26 | 1.27 | 1.27 | 1.27 |
Fx contracts - GBP | Line of Credit | Weighted Average |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Weighted average advance rate | 71.70% | 72.50% |  |  |  |  |  |  |
Fx contracts - GBP | Line of Credit | JP Morgan Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum amount of borrowings | $ 17,270,000 | $ 17,416,000 |  |  |  |  |  |  |
Borrowings outstanding | 17,270,000 | 17,416,000 |  |  |  |  |  |  |
Fx contracts - GBP | Line of Credit | HSBC Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum amount of borrowings | 380,740,000 | 383,967,000 |  |  |  |  |  |  |
Borrowings outstanding | 380,740,000 | 383,967,000 |  |  |  |  |  |  |
Fx contracts - GBP | Line of Credit | Goldman Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum amount of borrowings | 158,599,000 | 0 |  |  |  |  |  |  |
Borrowings outstanding | 158,599,000 | 0 |  |  |  |  |  |  |
Fx contracts - GBP | Line of Credit | MUFG Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum amount of borrowings | 202,970,000 | 204,690,000 |  |  |  |  |  |  |
Borrowings outstanding | $ 202,970,000 | $ 204,690,000 |  |  |  |  |  |  |
Fx contracts - EUR | Line of Credit |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Currency conversion rate | 1.08 | 1.10 | 1.08 | 1.08 | 1.08 | 1.10 | 1.10 | 1.10 |
Fx contracts - EUR | Line of Credit | Weighted Average |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Weighted average advance rate | 72.20% | 72.10% |  |  |  |  |  |  |
Fx contracts - EUR | Line of Credit | HSBC Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum amount of borrowings | $ 275,027,000 | $ 281,401,000 |  |  |  |  |  |  |
Borrowings outstanding | 275,027,000 | 281,401,000 |  |  |  |  |  |  |
Fx contracts - EUR | Line of Credit | Santander Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum amount of borrowings | 58,261,000 | 59,611,000 |  |  |  |  |  |  |
Borrowings outstanding | $ 54,677,000 | $ 55,716,000 |  |  |  |  |  |  |
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% | 80.40% |  |  |  |  |  |  |
VIE | Line of Credit | Barclays Securitization |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum amount of borrowings | $ 2,056,364,000 | $ 2,369,125,000 |  |  |  |  |  |  |
Borrowings outstanding | 2,056,364,000 | 2,157,157,000 |  |  |  |  |  |  |
VIE | Line of Credit | Barclays Securitization | Weighted Average |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Borrowings outstanding | 2,056,364,000 | 2,157,157,000 |  |  |  |  |  |  |
VIE | Fx contracts - GBP | Line of Credit | Barclays Securitization | Weighted Average |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Borrowings outstanding | 1,261,051,000 | 1,234,740,000 |  |  |  |  |  |  |
VIE | Fx contracts - EUR | Line of Credit | Barclays Securitization | Weighted Average |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Borrowings outstanding | $ 609,619,000 | $ 723,947,000 |  |  |  |  |  |  |
VIE | SEK | Line of Credit | Barclays Securitization | Weighted Average |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Borrowings outstanding | kr |  |  | kr 185,694 |  |  | kr 198,470 |  |  |

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