| In millions, except per share items | Jun-30-23 | Mar-31-23 | Jun-30-22 | Mar-31-22 | Jun-30-21 | Mar-31-21 | Dec-31-20 | Sep-30-20 |
| | 10-Q | 10-Q | 10-Q | 10-Q | 10-Q | 10-Q | 10-K | 10-Q |
| Net interest income | | | | | | | | |
| Interest income | 17.3 | 16.2 | 16.4 | 31.1 | 12.9 | 12.6 | 12.1 | 10.5 |
| Interest expense | -13.1 | -12.2 | -9.1 | -8.8 | -7.6 | -6.5 | -36.0 | 6.1 |
| Total net interest income | 4.2 | 3.9 | 7.3 | 22.3 | 5.3 | 6.2 | 5.4 | 4.4 |
| |
| Other income (loss) | | | | | | | | |
| Change in net assets related to consolidated CMBS variable interest entities | | | | | | | | |
| Change in unrealized gain (loss) on common stock investments | 0.2 | -1.3 | 3.0 | 0.3 | | | | |
| |
| Reversal of (provision for) credit losses, net | | | | | | | | |
| Other income | 0.0 | 0.3 | 0.1 | 0.2 | 0.5 | 0.3 | | |
| |
| Gain on deconsolidation of real estate owned | | | | | | | | |
| Gain on extinguishment of debt | | | 0.0 | | | | | |
| Equity in income (losses) of equity method investments | -0.9 | | | | | | | |
| Revenues from consolidated real estate owned (Note 9) | 1.0 | | 3.3 | | | | | |
| Total other income (loss) | 9.4 | 10.9 | 7.5 | 1.8 | 10.6 | 22.3 | 23.6 | 10.0 |
| |
| Operating expenses | | | | | | | | |
| General and administrative expenses | 2.4 | 2.2 | 1.9 | 1.8 | 1.8 | 1.5 | 1.0 | 1.2 |
| Loan servicing fees | 1.1 | 1.0 | 1.1 | 1.1 | 1.3 | 1.3 | 1.2 | 1.2 |
| Management fees | 0.8 | 0.8 | 0.8 | 0.7 | 0.5 | 0.5 | 0.5 | 0.5 |
| Expenses from consolidated real estate owned (Note 9) | 0.8 | 1.5 | 3.5 | 2.4 | | | | |
| Total operating expenses | 5.1 | 2.2 | 7.3 | 1.8 | 3.6 | 3.4 | 2.8 | 2.9 |
| Net income | 8.5 | 9.4 | 7.5 | 18.1 | 12.3 | 25.1 | 26.2 | 11.5 |
| Net (income) attributable to preferred shareholders | -0.9 | -0.9 | -0.9 | -0.9 | -0.9 | -0.9 | -2.6 | 0.9 |
| |
| Net (income) loss attributable to redeemable noncontrolling interests | | | | | | | | |
| Net income attributable to common stockholders | 5.7 | 6.6 | 3.9 | 12.4 | 5.5 | 8.4 | 9.3 | 2.9 |
| |
| Weighted-average common shares outstanding (in shares) | 17.2 | 17.1 | 14.7 | 13.9 | 5.3 | 5.0 | 5.2 | 5.3 |
| Weighted-average common shares outstanding - diluted (in shares) | 23.1 | 22.7 | 22.5 | 22.0 | 19.6 | 19.2 | 18.6 | 5.6 |
| |
| Earnings per share outstanding - basic (in dollars per share) | $0.33 | $0.38 | $0.26 | $0.90 | $1.04 | $1.67 | $1.79 | $0.54 |
| Earnings per share outstanding - diluted (in dollars per share) | $0.33 | $0.37 | $0.26 | $0.78 | $0.58 | $1.26 | $1.41 | $0.52 |
| |
| Dividends declared per common share (in dollars per share) | $0.69 | $0.69 | $0.50 | $0.50 | $0.48 | $0.48 | $0.40 | $0.40 |