| 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 |
| Revenues | | | | | | | | |
| Gain on sale of loans, net | 6.3 | 65.3 | 14.0 | 98.8 | 66.8 | 136.1 | 311.0 | 169.2 |
| Real estate services fees, net | 8.6 | 66.3 | 12.5 | 90.6 | 105.0 | 138.7 | 297.8 | 167.0 |
| Real estate services fees, net growth | -87.0% | 428.6% | -86.2% | -13.7% | -24.3% | -53.4% | 78.3% | 278.3% |
| Gain on mortgage servicing rights, net | 0.2 | 0.0 | | | | | | |
| Servicing fees (expense), net | 0.1 | -0.4 | | | | | | |
| Broker fee income | 0.1 | | | | | | | |
| Other | 0.9 | 0.3 | 1.5 | 0.5 | 0.3 | 0.7 | 1.1 | 0.4 |
| Total revenues, net | 8.6 | 66.3 | 12.5 | 90.6 | 105.0 | 138.7 | 297.8 | 167.0 |
| Total revenues, net growth | -87.0% | 428.6% | -86.2% | -13.7% | -24.3% | -53.4% | 78.3% | 278.3% |
| Expenses | | | | | | | | |
| Personnel | 30.7 | 52.8 | 52.9 | 65.2 | 64.1 | 89.6 | 124.6 | 77.8 |
| General, administrative and other | 15.7 | 16.8 | 24.5 | 22.4 | 35.3 | 37.4 | 33.8 | 28.0 |
| Occupancy | 5.3 | 4.2 | | | | | | |
| Total expenses | 56.1 | 81.2 | 81.3 | 96.9 | 249.4 | 156.4 | 238.0 | 95.7 |
| Operating loss | -47.5 | -14.9 | -89.4 | -6.3 | -144.4 | -17.7 | 59.7 | 71.3 |
| Operating margin | -553.0% | -22.4% | -712.2% | -6.9% | -137.5% | -12.8% | 20.1% | 42.7% |
| |
| Other income | | | | | | | | |
| Interest income | 15.3 | 65.7 | 118.9 | 165.2 | 186.8 | 230.3 | 263.6 | 276.8 |
| Interest expense | -19.1 | -63.3 | -113.8 | -155.9 | -184.3 | -226.0 | -260.8 | -274.9 |
| Change in fair value of long-term debt | 2.8 | 2.1 | 1.9 | -1.4 | 4.0 | -2.9 | -14.4 | -8.7 |
| Change in fair value of net trust assets, including trust REO gains | 9.2 | 6.6 | -5.7 | | | | | |
| Total other income, net | 8.1 | 11.1 | 1.3 | -1.9 | 3.9 | 6.3 | -12.0 | -12.4 |
| Income tax expense | 0.0 | 0.1 | 0.1 | -0.2 | 5.0 | 20.1 | 1.1 | -21.9 |
| Net loss | -39.4 | -3.9 | -88.2 | -8.0 | -145.4 | -31.5 | 46.7 | 80.8 |
| |
| Other comprehensive loss | | | | | | | | |
| Change in fair value of instrument specific credit risk of long-term debt | 17.2 | -2.7 | 0.0 | 0.9 | | | | |
| |
| Net loss per common share: | | | | | | | | |
| Basic (in dollars per share) | ($1.65) | ($0.22) | ($4.15) | ($0.38) | ($6.92) | ($1.62) | $3.54 | $8.00 |
| Diluted (in dollars per share) | ($1.65) | ($0.22) | ($4.15) | ($0.38) | ($6.92) | ($1.62) | $3.31 | $6.40 |