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Secured Debt Arrangements, Net - Additional Information (Details) € in Millions, £ in Millions, kr in Millions | 1 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 30, 2019 USD ($) extension | Jul. 31, 2018 | Dec. 31, 2021 USD ($) | Dec. 31, 2021 EUR (€) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2021 GBP (£) | Dec. 31, 2021 EUR (€) | Dec. 31, 2021 SEK (kr) | Jun. 30, 2021 USD ($) | Jun. 30, 2021 GBP (£) | Jun. 30, 2021 SEK (kr) | Mar. 31, 2021 USD ($) | Mar. 31, 2021 GBP (£) | Mar. 31, 2021 SEK (kr) | Jun. 30, 2020 USD ($) | Jun. 30, 2020 GBP (£) | Jun. 30, 2020 EUR (€) | Nov. 30, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average haircut under repurchase agreements |  |  | 30.20% |  | 36.30% |  | 30.20% | 30.20% | 30.20% |  |  |  |  |  |  |  |  |  |
Repayments of secured debt arrangements |  |  | $ 1,510,236,000 |  | $ 1,242,317,000 | $ 2,273,750,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing under facility |  |  | 4,932,049,000 |  | 4,395,764,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  | 4,159,330,000 |  | 3,449,665,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings outstanding |  |  | 4,150,268,000 |  | 3,436,672,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | JP Morgan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  | 1,484,992,000 |  | 1,170,969,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | JP Morgan Facility | USD |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing under facility |  |  | 1,344,283,000 |  | 1,113,156,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings outstanding |  |  | 1,329,923,000 |  | 984,125,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | JP Morgan Facility | Fx contracts - GBP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing under facility |  |  | 87,497,000 |  | 113,548,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings outstanding |  |  | 86,849,000 |  | 113,548,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | JP Morgan Facility | Fx contracts - EUR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing under facility |  |  | 68,220,000 |  | 73,296,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings outstanding |  |  | 68,220,000 |  | 73,296,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | DB Repurchase Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing under facility |  |  | 700,000,000 |  |  |  |  |  |  |  |  |  | $ 1,000,000,000 |  |  |  |  |  |
Balance |  |  | 259,073,000 |  | 520,457,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings outstanding |  |  | $ 259,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extension option |  |  | 1 year | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | DB Repurchase Facility | USD |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing under facility |  |  | $ 700,000,000 |  | 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings outstanding |  |  | 259,073,000 |  | 520,457,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | Goldman Sachs Repurchase Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing under facility |  |  | 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000
Balance |  |  | 168,231,000 |  | 332,352,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings outstanding |  |  | 168,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | Goldman Sachs Repurchase Facility | USD |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing under facility |  |  | 300,000,000 |  | 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings outstanding |  |  | 168,231,000 |  | 332,352,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | Credit Suisse Facility | USD |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing under facility |  |  | 161,609,000 |  | 374,251,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  | 148,720,000 |  | 369,182,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings outstanding |  |  | 148,720,000 |  | 369,182,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term after either party notifies the other party of intention to terminate |  | 6 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | Credit Suisse Facility | Fx contracts - GBP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | HSBC Facility | USD |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | HSBC Facility | Fx contracts - GBP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | HSBC Facility | Fx contracts - EUR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing under facility |  |  | 167,756,000 |  | 163,785,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  | 162,937,000 |  | 163,785,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings outstanding |  |  | 162,937,000 |  | 163,785,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit, amount outstanding |  |  | 162,900,000 |  |  |  |  | € 143.3 |  |  |  |  |  |  |  |  |  |  |
Line of Credit | Barclays Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of secured debt arrangements | € |  |  |  | € 16.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | Barclays Facility | USD |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing under facility |  |  | 200,000,000 |  | 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  | 32,693,000 |  | 35,192,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings outstanding |  |  | 32,693,000 |  | 35,192,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | Barclays Facility | Fx contracts - GBP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | Barclays Facility | Fx contracts - EUR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | Barclays Securitization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  | 1,902,684,000 |  | 857,728,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings outstanding |  |  |  |  |  |  | £ 960.2 | 328.9 | kr 2,100.0 |  |  |  |  |  |  |  |  |  |
Line of Credit | Barclays Securitization | VIE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing under facility |  |  | 1,902,684,000 |  | 857,728,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | £ 26.0 | € 5.3 |
Borrowings outstanding |  |  | $ 1,902,684,000 |  | $ 857,728,000 |  |  |  |  |  |  |  |  |  |  | $ 782,000,000 |  |  |
Deferring or waiving debt service payments, term |  |  | 18 months | 18 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of secured debt arrangements |  |  | $ 18,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in financing spread |  |  | 0.25% | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amended and Restated JPMorgan Facility | Line of Credit | JP Morgan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing under facility | $ 1,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of extensions available | extension | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  | $ 1,500,000,000 |  |  |  | 64.2 | € 60.0 |  |  |  |  |  |  |  |  |  |  |
Extension option |  |  | 1 year | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial Loan One | Line of Credit | Barclays Securitization | VIE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  | $ 312,900,000 |  |  |  | 231.3 |  |  | $ 281,700,000 | £ 237.6 |  | 227,400,000 | £ 165.0 |  |  |  |  |
Commercial Loan Two | Line of Credit | Barclays Securitization | VIE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  | $ 238,800,000 |  |  |  | £ 176.5 |  |  | $ 114,700,000 |  | kr 1,000.0 | $ 187,400,000 |  | kr 1,600.0 |  |  |  |

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