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Secured Debt Arrangements, Net - Summary of Outstanding Balances, Maximum and Average Balances of Borrowings (Details) $ in Thousands, € in Millions, £ in Millions, kr in Billions | 9 Months Ended | 12 Months Ended |  |
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Sep. 30, 2025 USD ($) | Dec. 31, 2024 USD ($) | Sep. 30, 2025 GBP (£) | Sep. 30, 2025 EUR (€) | Sep. 30, 2025 SEK (kr) | Dec. 31, 2024 GBP (£) | Dec. 31, 2024 EUR (€) | Dec. 31, 2024 SEK (kr)
Line of Credit |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Balance | $ 5,896,015 | $ 4,814,973 |  |  |  |  |  |
Collateral | 8,064,105 | 7,032,800 |  |  |  |  |  |
Line of Credit | USD |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Balance | 0 | 0 |  |  |  |  |  |
JPMorgan | Line of Credit |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Balance | 1,713,891 | 1,033,504 |  |  |  |  |  |
Collateral | 2,375,092 | 1,832,859 |  |  |  |  |  |
Maximum Month-End Balance | 1,713,890 | 1,063,261 |  |  |  |  |  |
Average Month-End Balance | 1,515,568 | 969,759 |  |  |  |  |  |
JPMorgan | Line of Credit | USD |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Balance | 1,713,891 | 1,033,504 |  |  |  |  |  |
Morgan Stanley Facility | USD |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Balance | 365,256 |  |  |  |  |  |  |
Collateral | 483,527 |  |  |  |  |  |  |
Maximum Month-End Balance | 365,256 |  |  |  |  |  |  |
Average Month-End Balance | 306,119 |  |  |  |  |  |  |
Morgan Stanley Facility | Fx contracts - GBP |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Balance | 299,453 |  |  |  |  |  |  |
Collateral | 368,600 |  |  |  |  |  |  |
Maximum Month-End Balance | 300,726 |  |  |  |  |  |  |
Average Month-End Balance | 207,836 |  |  |  |  |  |  |
Morgan Stanley Facility | Line of Credit | USD |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Balance | 365,256 | 0 |  |  |  |  |  |
Morgan Stanley Facility | Line of Credit | Fx contracts - GBP |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Balance | 299,453 | 0 |  |  |  |  |  |
DB | Line of Credit |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Balance | 27,300 | 123,434 |  |  |  |  |  |
Collateral | 45,500 | 199,217 |  |  |  |  |  |
Maximum Month-End Balance | 27,300 | 278,703 |  |  |  |  |  |
Average Month-End Balance | 68,967 | 201,020 |  |  |  |  |  |
DB | Line of Credit | USD |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Balance | 27,300 | 123,434 |  |  |  |  |  |
Goldman | Line of Credit | USD |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Balance |  | 0 |  |  |  |  |  |
Collateral |  | 0 |  |  |  |  |  |
Maximum Month-End Balance |  | 11,620 |  |  |  |  |  |
Average Month-End Balance |  | 2,903 |  |  |  |  |  |
Goldman | Line of Credit | Fx contracts - GBP |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Balance | 440,245 | 373,706 |  |  |  |  |  |
Collateral | 570,147 | 485,054 |  |  |  |  |  |
Maximum Month-End Balance | 440,244 | 390,163 |  |  |  |  |  |
Average Month-End Balance | 416,849 | 251,571 |  |  |  |  |  |
CS Facility | Line of Credit |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Balance | 498,105 | 462,886 |  |  |  |  |  |
Collateral | 751,904 | 702,927 |  |  |  |  |  |
Maximum Month-End Balance | 505,776 | 758,201 |  |  |  |  |  |
Average Month-End Balance | 516,416 | 640,453 |  |  |  |  |  |
CS Facility | Line of Credit | USD |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Balance | 498,105 | 462,886 |  |  |  |  |  |
CS Facility | Line of Credit | Fx contracts - GBP |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Balance | 281,612 |  |  |  |  |  |  |
Collateral | 410,332 |  |  |  |  |  |  |
Maximum Month-End Balance | 293,685 |  |  |  |  |  |  |
Average Month-End Balance | 63,922 |  |  |  |  |  |  |
CS Facility | Line of Credit | Fx contracts - EUR |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Balance | 281,612 |  |  |  |  |  |  |
HSBC Facility | Line of Credit |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Balance | 0 | 627,646 |  |  |  |  |  |
Collateral | 0 | 839,123 |  |  |  |  |  |
Maximum Month-End Balance | 674,118 | 672,422 |  |  |  |  |  |
Average Month-End Balance | 514,882 | 653,182 |  |  |  |  |  |
HSBC Facility | Line of Credit | Fx contracts - GBP |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Balance | 0 | 377,483 |  |  |  |  |  |
HSBC Facility | Line of Credit | Fx contracts - EUR |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Balance | 0 | 250,162 |  |  |  |  |  |
Barclays Facility | Line of Credit |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Balance |  | 321,546 |  |  |  |  |  |
Collateral |  | 420,774 |  |  |  |  |  |
Maximum Month-End Balance |  | 353,153 |  |  |  |  |  |
Average Month-End Balance |  | 242,792 |  |  |  |  |  |
Barclays Facility | Line of Credit | USD |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Balance | 475,291 | 321,546 |  |  |  |  |  |
Collateral | 652,029 |  |  |  |  |  |  |
Maximum Month-End Balance | 475,291 |  |  |  |  |  |  |
Average Month-End Balance | 334,338 |  |  |  |  |  |  |
Barclays Facility | Line of Credit | Fx contracts - GBP |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Balance | 124,282 | 0 |  |  |  |  |  |
Collateral | 157,263 |  |  |  |  |  |  |
Maximum Month-End Balance | 124,817 |  |  |  |  |  |  |
Average Month-End Balance | 124,283 |  |  |  |  |  |  |
MUFG Facility | Line of Credit |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Balance |  | 171,972 |  |  |  |  |  |
Collateral |  | 209,493 |  |  |  |  |  |
Maximum Month-End Balance |  | 211,057 |  |  |  |  |  |
Average Month-End Balance |  | 197,420 |  |  |  |  |  |
MUFG Facility | Line of Credit | Fx contracts - GBP |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Balance | 0 | 171,972 |  |  |  |  |  |
Churchill | Line of Credit |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Balance |  | 121,289 |  |  |  |  |  |
Churchill | Line of Credit | USD |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Balance | 0 | 121,289 |  |  |  |  |  |
Santander Facility | Line of Credit | USD |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Balance | 0 | 0 |  |  |  |  |  |
Collateral |  | 0 |  |  |  |  |  |
Maximum Month-End Balance |  | 67,500 |  |  |  |  |  |
Average Month-End Balance |  | 56,250 |  |  |  |  |  |
Santander Facility | Line of Credit | Fx contracts - EUR |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Balance |  | 0 |  |  |  |  |  |
Collateral |  | 0 |  |  |  |  |  |
Maximum Month-End Balance |  | 54,677 |  |  |  |  |  |
Average Month-End Balance |  | 22,684 |  |  |  |  |  |
Barclays Securitization | Line of Credit |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Balance | 1,680,125 | 1,587,779 | £ 800.3 | € 335.2 | kr 2.0 | £ 716.8 | € 493.9 | kr 2.0
Collateral | 2,249,711 | 2,182,088 |  |  |  |  |  |
Maximum Month-End Balance | 1,801,532 | 2,249,538 |  |  |  |  |  |
Average Month-End Balance | 1,720,970 | 2,041,421 |  |  |  |  |  |
Revolving Credit Facility | Line of Credit |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Balance | 0 | 0 |  |  |  |  |  |
Collateral | 0 | 0 |  |  |  |  |  |
Maximum Month-End Balance | 0 | 150,000 |  |  |  |  |  |
Average Month-End Balance | 19,625 | 38,796 |  |  |  |  |  |
Churchill Facility | Line of Credit |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Collateral |  | 161,264 |  |  |  |  |  |
Maximum Month-End Balance |  | 126,080 |  |  |  |  |  |
Average Month-End Balance |  | 123,684 |  |  |  |  |  |
JP Morgan Chase, DB Repurchase Facility, Goldman Sachs, Credit Suisse, Barclays Facility, HSBC Facilities And Barclays Securitization | Line of Credit |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Balance | $ 5,905,560 | $ 4,823,762 |  |  |  |  |  |

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