| In millions, except per share items | Dec-31-16 | Dec-31-15 | Dec-31-14 | Dec-31-13 | Dec-31-12 |
| | 10-K | 10-K | 10-K | 10-K | 10-K |
| Revenue: | | | | | |
| Rental revenue | 123.5 | 111.2 | 75.9 | 48.0 | 3.6 |
| Other revenue | 3.1 | 2.5 | 2.0 | 1.6 | 0.0 |
| Total revenue | 126.6 | 113.7 | 77.9 | 49.6 | 3.6 |
| Total revenue growth | 11.4% | 45.9% | 57.1% | 1271.5% | |
| Expenses: | | | | | |
| Property operating and maintenance | 23.4 | 22.1 | 17.3 | 12.5 | 1.9 |
| Real estate taxes | 17.7 | 15.8 | 11.0 | 6.9 | 1.3 |
| Homeowners’ association fees | 1.7 | 1.9 | 1.3 | 1.1 | 0.4 |
| Property management | 10.9 | 11.1 | 9.4 | 11.7 | 0.5 |
| Depreciation and amortization | 37.3 | 35.2 | 25.6 | 20.2 | 2.1 |
| General and administrative | 14.5 | 15.9 | 10.3 | 6.8 | 0.9 |
| Share-based compensation | 2.7 | 2.6 | 1.0 | 0.9 | |
| Severance and other | 2.0 | | | | |
| |
| Transaction expenses | | | | | |
| Impairment of real estate | 1.1 | 0.1 | 0.6 | | |
| Total expenses | 137.8 | 128.1 | 134.1 | 72.9 | 9.1 |
| Loss before other income, income taxes and non-controlling interests | -11.1 | -14.4 | -56.2 | -23.3 | -5.5 |
| Operating margin | -8.8% | -12.7% | -72.1% | -46.9% | -152.7% |
| |
| Other income: | | | | | |
| Net gain on disposition of real estate | | | | | |
| Adjustments for derivative instruments, net | 0.0 | -0.1 | -0.5 | | |
| |
| Other expense | | | | | |
| Total other income | 9.5 | 3.7 | -0.5 | -2.7 | |
| Loss before income taxes and non-controlling interests | -1.6 | -10.7 | -56.7 | -24.6 | |
| Income tax expense, net | -1.0 | 0.8 | | | 0.0 |
| Net loss | -2.6 | -10.0 | -56.7 | -24.6 | -5.5 |
| Net loss attributable to noncontrolling interests - Operating Partnership | 0.2 | 0.6 | 0.1 | 0.0 | 0.0 |
| Net loss attributable to controlling interests | -2.5 | -9.4 | -56.6 | -24.5 | -5.5 |
| Preferred stock distributions | -0.1 | -0.1 | -0.1 | -0.1 | 0.0 |
| Net loss attributable to common stockholders | -2.6 | -9.5 | -56.7 | -24.6 | -5.5 |
| |
| Loss per share - basic and diluted (Note 7): | | | | | |
| Net loss attributable to common shares (in dollars per share) | ($0.07) | ($0.26) | ($1.49) | ($0.63) | ($0.04) |
| |
| Weighted average common shares outstanding (in shares) | 35.6 | 36.2 | 38.1 | 39.1 | 37.3 |
| |
| Comprehensive Loss: | | | | | |
| Net loss | -2.6 | -10.0 | -56.7 | -24.6 | -5.5 |
| |
| Other comprehensive income (loss): | | | | | |
| Net change in fair value of cash flow hedges | | | | | |
| Losses reclassified into earnings from other comprehensive income (loss) | | | | | |
| Other comprehensive income (loss) | | | | | |
| Comprehensive loss | | | | | |
| Comprehensive loss attributable to noncontrolling interests - Operating Partnership | | | | | |
| Comprehensive loss attributable to controlling interests | 1.7 | -10.8 | -56.4 | -24.8 | -5.5 |