| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Interest income: | | | | | | | | |
| Loans held-for-investment | 208.5 | 197.9 | 235.0 | 240.0 | 179.3 | 113.1 | 55.6 | 8.4 |
| Cash and cash equivalents | 2.4 | 0.3 | 0.6 | 2.8 | 0.2 | 0.0 | 0.0 | |
| Total interest income | 210.9 | 198.3 | 237.7 | 246.3 | 183.9 | 117.8 | 60.8 | 9.1 |
| |
| Interest expense: | | | | | | | | |
| Repurchase facilities | 49.5 | 26.0 | 58.4 | 67.6 | | | | |
| Secured credit facility | 0.4 | | | | | | | |
| Securitized debt obligations | 51.6 | 29.9 | 26.3 | 46.8 | 17.7 | | | |
| |
| Convertible senior notes | | | | | | | | |
| Term financing facility | -1.7 | -7.6 | | | | -42.5 | -11.0 | -0.5 |
| Asset-specific financings | 1.7 | 2.2 | 3.9 | 2.9 | | | | |
| Total interest expense | 1.7 | 7.6 | | | | 42.5 | 11.0 | 0.5 |
| Net interest income | -1.7 | -7.6 | | | | 75.4 | 49.8 | 8.7 |
| |
| Other (loss) income: | | | | | | | | |
| Gain (loss) on extinguishment of debt | -18.8 | -8.9 | | | | | | |
| Fee income | 1.0 | | 1.1 | 1.2 | 1.4 | | 0.2 | |
| Total other (loss) income | -88.8 | 11.1 | -69.5 | 1.2 | 1.4 | | 0.2 | 0.2 |
| |
| Expenses: | | | | | | | | |
| Compensation and benefits | 20.2 | 21.5 | 13.3 | 14.3 | | | | |
| Servicing expenses | 5.7 | 5.2 | 4.1 | 3.7 | 2.2 | 1.4 | 0.6 | 0.1 |
| Other operating expenses | 10.8 | 8.6 | 15.8 | 7.2 | 16.0 | 11.0 | 6.9 | 7.4 |
| Total expenses | 36.7 | 35.3 | 95.1 | 40.3 | 30.7 | 22.1 | 14.7 | 8.6 |
| Income (loss) before income taxes | -40.8 | 68.5 | -39.8 | 70.2 | 63.1 | 53.3 | 35.3 | 0.2 |
| Provision for (benefit from) income taxes | 0.0 | 0.2 | 0.6 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 |
| Net income (loss) | -40.8 | 68.4 | -40.4 | 70.2 | 63.1 | 53.3 | 35.4 | 0.1 |
| Dividends on preferred stock | 14.5 | 0.8 | 0.1 | 0.1 | 0.1 | 0.1 | | |
| Net income (loss) attributable to common stockholders | -55.3 | 67.6 | -40.5 | 70.1 | 63.0 | 53.3 | 35.4 | 0.1 |
| Net income (loss) attributable to common stockholders - diluted | -55.3 | 67.6 | -40.5 | 70.1 | 63.0 | 53.3 | 35.4 | 0.1 |
| |
| Basic earnings (loss) per weighted average common share (in usd per share) | ($1.04) | $1.24 | ($0.73) | $1.32 | $1.45 | $0.60 | | |
| Diluted earnings (loss) per weighted average common share (in usd per share) | ($1.04) | $1.23 | ($0.73) | $1.32 | $1.42 | $0.60 | | |
| |
| Weighted average number of shares of common stock outstanding: | | | | | | | | |
| Basic (in shares) | 53.0 | 54.6 | 55.2 | 53.1 | 43.4 | 43.2 | | |
| Diluted (in shares) | 53.0 | 54.9 | 55.2 | 53.1 | 52.0 | 43.2 | | |
| Net income (loss) attributable to common stockholders | -55.3 | 67.6 | -40.5 | 70.1 | 63.0 | 53.3 | 35.4 | 0.1 |
| |
| Comprehensive income (loss) | | | | | | | | |
| Comprehensive income (loss) | -55.3 | 67.6 | -40.6 | 70.3 | 62.8 | | | |