In millions, except per share items | Jun-30-23 | Dec-31-22 | Sep-30-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 | Jun-30-21 |
| 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q |
Revenues [Abstract] | | | | | | | | |
Total interest income | | | | 40.8 | | | | |
Total dividend income | | | | 7.2 | | | | |
Total fee and other income | | | | 5.1 | | | | |
Total payment-in-kind interest income | | | | 2.5 | | | | |
|
Interest income from cash | | | | | | | | |
Total investment income | | 175.4 | 111.9 | 55.6 | | | | |
|
Operating expenses: | | | | | | | | |
Interest and other financing fees | | 45.2 | 28.5 | 13.2 | | | | |
Base management fee (Note 2) | | 23.6 | 15.6 | 7.4 | | | | |
Incentive management fees (Note 2) | | | 1.8 | | | | | |
General and administrative expenses (Note 2) | | 9.9 | 11.0 | 10.3 | 9.2 | 9.1 | 8.5 | 7.5 |
Total operating expenses | | 78.1 | 52.2 | 23.8 | | | | |
Net investment income before taxes | | 97.3 | 59.7 | 31.8 | | | | |
Net investment income after taxes | | | | 31.8 | | | | |
|
Net realized gains (losses): | | | | | | | | |
Net realized gains (losses) on investments | | | -15.9 | -7.6 | | -0.1 | | |
Foreign currency transactions | | 25.2 | 2.0 | -8.7 | | -6.0 | | |
Net realized gains (losses) | | | | -10.2 | | | | |
|
Net unrealized appreciation (depreciation): | | | | | | | | |
Net unrealized appreciation (depreciation) on investments | | | | -61.8 | | | | |
Credit support agreements | | -6.3 | -9.9 | -13.4 | | | | |
|
Foreign currency transactions | | | | | | | | |
Net unrealized appreciation (depreciation) | | | | | | | | |
Net realized gains (losses) and unrealized appreciation (depreciation) on investments, credit support agreements and foreign currency transactions | | | | | | | | |
Benefit from (provision for) income taxes | | | | | | | | |
Net increase (decrease) in net assets resulting from operations | | | | | | | | |
Net investment income per share—basic (in dollars per share) | | $0.89 | $0.55 | $0.29 | | | | |
Net investment income per share—diluted (in dollars per share) | | $0.89 | $0.55 | $0.29 | | | | |
Net increase | | | | 0.0 | | | | |
|
Dividends/distributions per share: | | | | | | | | |
Total dividends/distributions per share, declared (in dollars per share) | | $0.72 | $0.48 | $0.24 | | | | |
Total dividends/distributions per share, paid (in dollars per share) | | $0.72 | $0.48 | $0.24 | | | | |
|
Weighted average shares outstanding—basic (in shares) | | 80.7 | 55.0 | 27.7 | | | | |
Weighted average shares outstanding—diluted (in shares) | | 80.7 | 55.0 | 27.7 | | | | |