| In millions, except per share items | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 | Dec-31-14 | Dec-31-13 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Revenues: | | | | | | | |
| Rental revenues | 207.0 | | | | | | |
| Total revenues | 207.0 | 183.0 | 94.2 | 56.8 | 248.1 | 423.3 | 72.3 |
| Total revenues growth | 13.1% | 94.3% | 65.9% | -77.1% | -41.4% | 485.5% | |
| Expenses: | | | | | | | |
| Residential property operating expenses | 77.8 | 64.0 | 62.8 | 66.5 | 66.3 | 26.0 | 0.8 |
| Property management expenses | 15.4 | 13.2 | 9.0 | 3.7 | | | |
| Depreciation and amortization | 82.2 | 81.0 | 61.6 | 27.0 | 7.5 | 1.1 | 0.0 |
| Acquisition and integration costs | | | | | 2.3 | 2.6 | 1.4 |
| Impairment | 4.5 | 12.7 | 40.1 | 57.9 | 72.2 | 21.8 | |
| Mortgage loan servicing costs | 0.9 | 1.5 | 10.7 | 34.6 | 62.3 | 68.2 | 10.4 |
| Interest expense | -84.1 | -77.0 | -59.6 | -53.9 | -53.7 | -35.8 | -4.6 |
| Share-based compensation | 5.9 | 3.0 | 4.1 | 1.3 | 0.2 | 0.2 | |
| General and administrative | 25.8 | 13.8 | 11.0 | 10.6 | 10.1 | 13.3 | 2.8 |
| |
| Management fees to AAMC | | | | | | | |
| Termination fee to AAMC | | | | | | | |
| Total expenses | 391.8 | 378.6 | 339.7 | 350.4 | 363.8 | 263.0 | 33.5 |
| Operating loss | -94.2 | -131.8 | -182.8 | -227.2 | -49.5 | | |
| Operating margin | -45.5% | -72.0% | -194.1% | -400.2% | -19.9% | | |
| Insurance recoveries | 0.7 | 0.6 | 3.3 | | | | |
| Other (loss) income | -10.8 | 0.9 | | -0.8 | 3.5 | 2.5 | |
| Net loss before income taxes | -105.2 | -130.8 | -185.4 | -227.9 | -45.9 | 188.9 | 39.6 |
| Income tax expense | -0.2 | 0.0 | 0.0 | -0.1 | -0.1 | 0.0 | |
| Net loss | -105.4 | -130.8 | -185.5 | -228.0 | -46.0 | 188.9 | 39.6 |
| |
| Loss per share of common stock - basic: | | | | | | | |
| Loss per basic share (usd per share) | ($1.96) | ($2.44) | ($3.47) | ($4.18) | ($0.81) | $3.36 | $1.67 |
| |
| Weighted average common stock outstanding – basic (in shares) | 53.8 | 53.6 | 53.5 | 54.5 | 56.8 | 56.2 | 23.7 |
| |
| Loss per share of common stock - diluted: | | | | | | | |
| Loss per diluted share (usd per share) | ($1.96) | ($2.44) | ($3.47) | ($4.18) | ($0.81) | $3.34 | $1.61 |
| Weighted average common stock outstanding – diluted (in shares) | 53.8 | 53.6 | 53.5 | 54.5 | 56.8 | 56.6 | 24.6 |
| |
| Dividends declared per common share (usd per share) | $0.45 | $0.60 | $0.60 | $0.75 | $1.83 | $2.03 | $0.35 |