| In millions, except per share items | Dec-31-22 | Dec-05-22 | Dec-31-21 | Dec-05-21 | Dec-31-20 | Dec-05-20 | Dec-31-19 | Dec-31-18 |
| | 10-K | 8-K | 10-K | 8-K | 10-K | 8-K | 10-K | 10-K |
| Operating activities | | | | | | | | |
| Net increase (decrease) in net assets resulting from operations | -9.2 | | 133.8 | | 71.4 | | | |
| |
| Adjustments to reconcile net increase (decrease) in net assets resulting from operations to net cash from (used in) operating activities: | | | | | | | | |
| Realized loss on extinguishment of debt | | | 6.2 | | 2.4 | | | |
| Net amortization of investment discounts and premiums | -9.6 | | -9.9 | | -9.6 | | | |
| Amortization of original issue discount on debt | 0.2 | | 1.3 | | 1.2 | | | |
| Amortization of deferred debt issuance costs | 3.0 | | 3.7 | | 3.5 | | | |
| Changes in assets and liabilities: | | | | | | | | |
| Purchase of investments | -330.4 | | -750.2 | | -448.8 | | -686.2 | -619.9 |
| Decrease (increase) in prepaid expenses and other assets | -0.2 | | -1.1 | | 1.4 | | | |
| Increase (decrease) in interest and debt related payables | -1.6 | | 1.0 | | -1.0 | | | |
| Increase (decrease) in accrued expenses and other liabilities | 0.6 | | -0.2 | | -0.6 | | | |
| Net cash provided by (used in) operating activities | 203.9 | | -82.6 | | 122.3 | | | |
| |
| Financing activities | | | | | | | | |
| Draws on credit facilities | 572.6 | | 915.5 | | 504.0 | | | |
| Repayments of credit facility draws | -503.2 | | -905.4 | | -614.0 | | | |
| Payments of debt issuance costs | | | -4.4 | | -4.1 | | | |
| Dividends paid to shareholders | -70.5 | | -69.3 | | -76.6 | | | |
| |
| Repurchase of shares | | | | | | | | |
| Repayment of convertible notes | -140.0 | | | | | | | |
| |
| Repayment of unsecured notes | | | | | | | | |
| Proceeds from issuance of unsecured notes | | | | | | | | |
| Net cash provided by (used in) financing activities | -141.1 | | 82.2 | | -147.2 | | | |
| |
| Supplemental cash flow information | | | | | | | | |
| Interest payments | 36.9 | | 33.5 | | 36.2 | | | |
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| Distributions Payable | | | | | | | | |