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Debt Obligations - Narrative (Details) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
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Sep. 30, 2024 USD ($) $ / shares | Oct. 31, 2024 USD ($) | Sep. 30, 2024 USD ($) $ / shares | Jun. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) extension | Jan. 31, 2024 USD ($) facility | Sep. 30, 2024 USD ($) $ / shares | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) $ / shares | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) | May 31, 2024 USD ($) | Apr. 30, 2024 USD ($) | Feb. 29, 2024 USD ($)
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, number of facilities consolidated | facility |  |  |  |  |  | 2 |  |  |  |  |  |  |  |
Outstanding letters of credit | $ 5,000,000.0 |  | $ 5,000,000.0 |  |  |  | $ 5,000,000.0 |  | $ 5,000,000.0 |  |  |  |  |
Junior subordinated notes to subsidiary trust issuing preferred securities | $ 144,480,000 |  | $ 144,480,000 |  |  |  | $ 144,480,000 |  | $ 144,480,000 |  | $ 143,896,000 |  |  |
Debt, Wtd. Avg. Rate | 7.38% |  | 7.38% |  |  |  | 7.38% |  | 7.38% |  |  |  |  |
CLO 15 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt paid down |  |  |  | $ 674,400,000 |  |  |  |  |  |  |  |  |  |
Debt face value issued to third parties |  |  |  |  |  |  |  |  |  |  | $ 674,412,000 |  |  |
Debt, Wtd. Avg. Rate |  |  |  |  |  |  |  |  |  |  | 6.82% |  |  |
CLO 14, 16 and 19 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt paid down |  |  |  |  |  |  |  |  | $ 896,500,000 |  |  |  |  |
Q Series securitization |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average note rate including certain fees and costs, percentage | 7.87% |  | 7.87% |  |  |  | 7.87% |  | 7.87% |  | 7.99% |  |  |
Debt paid down |  |  |  |  |  |  |  |  | $ 58,100,000 |  |  |  |  |
Debt face value issued to third parties | $ 157,198,000 |  | $ 157,198,000 |  |  |  | $ 157,198,000 |  | $ 157,198,000 |  | $ 215,278,000 |  |  |
Debt, Wtd. Avg. Rate | 6.96% |  | 6.96% |  |  |  | 6.96% |  | 6.96% |  | 7.38% |  |  |
9.00% Notes | Senior unsecured notes | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt face value issued to third parties |  | $ 100,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  | 9.00% |  |  |  |  |  |  |  |  |  |  |  |
4.75% Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt face value issued to third parties |  |  |  |  |  |  |  |  |  |  | $ 110,000,000 |  |  |
Debt, Wtd. Avg. Rate | 4.75% |  | 4.75% |  |  |  | 4.75% |  | 4.75% |  | 4.75% |  |  |
4.75% Notes | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt paid down |  | $ 110,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  | 4.75% |  |  |  |  |  |  |  |  |  |  |  |
Convertible senior unsecured notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt face value issued to third parties | $ 287,500,000 |  | $ 287,500,000 |  |  |  | $ 287,500,000 |  | $ 287,500,000 |  | $ 287,500,000 |  |  |
Percentage of notes required to be repurchased if the agreement is fundamentally changed |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |
Interest expense |  |  |  |  |  |  | 6,100,000 | $ 6,100,000 | $ 18,300,000 | $ 18,200,000 |  |  |  |
Interest expense related to cash coupon |  |  |  |  |  |  | 5,400,000 | 5,400,000 | 16,200,000 | 16,100,000 |  |  |  |
Deferred fees expensed as interest expense |  |  |  |  |  |  | $ 700,000 | $ 700,000 | $ 2,100,000 | $ 2,100,000 |  |  |  |
Weighted average cost of notes, percentage | 8.43% |  | 8.43% |  |  |  | 8.43% |  | 8.43% |  | 8.42% |  |  |
7.50% convertible notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 7.50% |  | 7.50% |  |  |  | 7.50% |  | 7.50% |  |  |  |  |
Conversion rate of the notes to common stock, per $1,000 principal amount of notes | 0.0609100 |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price per share of common stock (in dollars per share) | $ / shares | $ 16.42 |  | $ 16.42 |  |  |  | $ 16.42 |  | $ 16.42 |  |  |  |  |
Junior subordinated notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average note rate including certain fees and costs, percentage | 7.56% |  | 7.56% |  |  |  | 7.56% |  | 7.56% |  | 8.56% |  |  |
Debt face value issued to third parties | $ 154,336,000 |  | $ 154,336,000 |  |  |  | $ 154,336,000 |  | $ 154,336,000 |  | $ 154,336,000 |  |  |
Deferred fees expensed as interest expense |  |  |  |  |  |  |  |  | 1,400,000 |  | 1,500,000 |  |  |
Junior subordinated notes to subsidiary trust issuing preferred securities | 144,500,000 |  | 144,500,000 |  |  |  | 144,500,000 |  | 144,500,000 |  | 143,900,000 |  |  |
Deferred amount due at maturity | $ 8,500,000 |  | $ 8,500,000 |  |  |  | $ 8,500,000 |  | $ 8,500,000 |  | $ 9,000,000.0 |  |  |
Debt, Wtd. Avg. Rate | 7.47% |  | 7.47% |  |  |  | 7.47% |  | 7.47% |  | 8.48% |  |  |
Amount payable on default of senior debt | $ 0 |  | $ 0 |  |  |  | $ 0 |  | $ 0 |  |  |  |  |
Structured Business |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average note rate including certain fees and costs, percentage | 7.95% |  | 7.95% |  |  |  | 7.95% |  | 7.95% |  | 8.26% |  |  |
Leverage on loans and investment portfolio financed through credit and repurchase facilities, excluding securities repurchase facility and working capital facility | 68.00% |  | 68.00% |  |  |  | 68.00% |  | 68.00% |  | 69.00% |  |  |
Debt, Wtd. Avg. Rate | 7.49% |  | 7.49% |  |  |  | 7.49% |  | 7.49% |  |  |  |  |
Structured Business | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average loan spread |  |  |  |  |  | 0.0550 |  |  |  |  |  |  |  |
Structured Business | $400M credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 400,000,000.0 |  | $ 400,000,000.0 |  |  |  | $ 400,000,000.0 |  | $ 400,000,000.0 |  |  |  |  |
Variable rate, spread |  |  | 3.25% |  |  |  |  |  |  |  |  |  |  |
SOFR floor, percentage |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |
Debt, Wtd. Avg. Rate | 8.21% |  | 8.21% |  |  |  | 8.21% |  | 8.21% |  |  |  |  |
Structured Business | $250M repurchase facility, maturing 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 250,000,000.0 |  | $ 250,000,000.0 |  |  |  | $ 250,000,000.0 |  | $ 250,000,000.0 |  |  |  |  |
Variable rate, spread |  |  | 3.25% |  |  |  |  |  |  |  |  |  |  |
SOFR floor, percentage |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |
Length of extension option | 1 year |  | 1 year |  |  |  | 1 year |  | 1 year |  |  |  |  |
Debt, Wtd. Avg. Rate | 0.00% |  | 0.00% |  |  |  | 0.00% |  | 0.00% |  |  |  |  |
Structured Business | $650M repurchase facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 650,000,000.0 |  |  |  |  |  |  |  |  |  |
SOFR floor, percentage |  |  |  | 0.25% |  |  |  |  |  |  |  |  |  |
Structured Business | $650M repurchase facility | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate, spread |  |  |  | 2.61% |  |  |  |  |  |  |  |  |  |
Structured Business | $650M repurchase facility | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate, spread |  |  |  | 3.11% |  |  |  |  |  |  |  |  |  |
Structured Business | $200M credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 200,000,000.0 |  |  |  |  |  |  |  |  |
Structured Business | $100M credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 100,000,000 |  | $ 100,000,000 |  |  |  | $ 100,000,000 |  | $ 100,000,000 |  |  |  | $ 100,000,000.0 |
Debt, Wtd. Avg. Rate | 0.00% |  | 0.00% |  |  |  | 0.00% |  | 0.00% |  |  |  |  |
Structured Business | $500M repurchase facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000.0
Structured Business | $1B repurchase facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 1,000,000,000 |  | $ 1,000,000,000 |  | 1,000,000,000.00 |  | $ 1,000,000,000 |  | $ 1,000,000,000 |  |  |  |  |
Debt, Wtd. Avg. Rate | 7.51% |  | 7.51% |  |  |  | 7.51% |  | 7.51% |  |  |  |  |
Structured Business | $450M repurchase facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 450,000,000.0
Structured Business | $350M repurchase facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 350,000,000 |  | $ 350,000,000 |  | $ 350,000,000.0 |  | $ 350,000,000 |  | $ 350,000,000 |  |  |  |  |
Length of extension option |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |
Maturity extensions exercised | extension |  |  |  |  | 1 |  |  |  |  |  |  |  |  |
Number of extension options | extension |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Debt, Wtd. Avg. Rate | 7.05% |  | 7.05% |  |  |  | 7.05% |  | 7.05% |  |  |  |  |
Structured Business | $250M credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 250,000,000 |  | $ 250,000,000 |  | $ 250,000,000.0 |  | $ 250,000,000 |  | $ 250,000,000 |  |  |  |  |
Variable rate, spread |  |  |  |  | 3.25% |  |  |  |  |  |  |  |  |
SOFR floor, percentage |  |  |  |  | 2.50% |  |  |  |  |  |  |  |  |
Length of extension option | 1 year |  | 1 year |  | 1 year |  | 1 year |  | 1 year |  |  |  |  |
Debt, Wtd. Avg. Rate | 8.21% |  | 8.21% |  |  |  | 8.21% |  | 8.21% |  |  |  |  |
Structured Business | $225M credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  | $ 225,000,000.0 |  |  |
Structured Business | $25M credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  | $ 25,000,000.0 |  |  |
Structured Business | $150M credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 150,000,000.0 |  |  |  |  |  |  |  |
Variable rate, spread |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |
Agency Business |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding letters of credit |  |  |  | $ 70,000,000.0 |  |  |  |  |  |  |  | $ 64,000,000.0 |  |
Debt, Wtd. Avg. Rate | 6.37% |  | 6.37% |  |  |  | 6.37% |  | 6.37% |  |  |  |  |
Agency Business | $200M credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 200,000,000 |  | $ 200,000,000 |  |  |  | $ 200,000,000 |  | $ 200,000,000 |  |  |  |  |
Debt, Wtd. Avg. Rate | 6.36% |  | 6.36% |  |  |  | 6.36% |  | 6.36% |  |  |  |  |
Agency Business | $100M credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 100,000,000 |  | $ 100,000,000 |  |  |  | $ 100,000,000 |  | $ 100,000,000 |  |  |  |  |
Debt, Wtd. Avg. Rate | 6.31% |  | 6.31% |  |  |  | 6.31% |  | 6.31% |  |  |  |  |
Agency Business | $500M repurchase facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 500,000,000 |  | $ 500,000,000 | $ 500,000,000.0 |  |  | $ 500,000,000 |  | $ 500,000,000 |  |  |  |  |
Debt, Wtd. Avg. Rate | 6.33% |  | 6.33% |  |  |  | 6.33% |  | 6.33% |  |  |  |  |

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