| In millions, except per share items | Jun-30-23 | Jun-05-23 | Sep-30-22 | Jun-30-22 | Jun-05-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 |
| | 10-Q | 8-K | 10-Q | 10-Q | 8-K | 10-Q | 10-K | 10-Q |
| Operating activities | | | | | | | | |
| Net increase (decrease) in net assets resulting from operations | | | 83.5 | 146.1 | | | 133.8 | 101.2 |
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| Adjustments to reconcile net increase (decrease) in net assets resulting from operations to net cash from (used in) operating activities: | | | | | | | | |
| Net realized (gain) loss | | | | 18.4 | | | | |
| Realized loss on extinguishment of debt | | | | | | | | 6.2 |
| Change in net unrealized (appreciation) depreciation of investments | | | | 10.7 | | | | |
| Net amortization of investment discounts and premiums | | | -9.9 | -15.4 | | | -9.9 | -8.0 |
| Amortization of original issue discount on debt | | | 0.5 | 1.4 | | | 1.3 | 1.0 |
| Interest and dividend income paid in kind | | | | -3.1 | | | | |
| Amortization of deferred debt issuance costs | | | 4.8 | 5.3 | | | 3.7 | 2.8 |
| Changes in assets and liabilities: | | | | | | | | |
| Purchase of investments | | | -336.0 | -546.2 | | -445.5 | -515.5 | -68.3 |
| Decrease (increase) in prepaid expenses and other assets | | | -1.4 | -0.9 | | | -1.1 | -0.4 |
| Increase (decrease) in interest and debt related payables | | | 0.1 | -0.3 | | | 1.0 | -6.5 |
| Increase (decrease) in accrued expenses and other liabilities | | | 0.3 | 0.1 | | | -0.2 | 0.0 |
| Net cash provided by (used in) operating activities | | | 171.4 | -46.3 | | | -82.6 | -49.3 |
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| Financing activities | | | | | | | | |
| Draws on credit facilities | | | 1,034.1 | 1,315.9 | | | 915.5 | 743.8 |
| Repayments of credit facility draws | | | -490.0 | -1,137.6 | | | -905.4 | -767.7 |
| Payments of debt issuance costs | | | | | | | -4.4 | -4.2 |
| Dividends paid to shareholders | | | -69.3 | -104.0 | | | -69.3 | -52.0 |
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| Repurchase of shares | | | | | | | | |
| Repayment of convertible notes | | | -140.0 | -140.0 | | | | |
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| Repayment of unsecured notes | | | | | | | | |
| Proceeds from issuance of unsecured notes | | | | | | | | |
| Net cash provided by (used in) financing activities | | | -65.9 | 75.8 | | | 82.2 | 65.8 |
| Net increase (decrease) in cash and cash equivalents (including restricted cash) | | | | 29.9 | | | | |
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| Supplemental cash flow information | | | | | | | | |
| Interest payments | | | 51.8 | 51.4 | | | 33.5 | 32.8 |
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| Distributions Payable | | | | | | | | |