Investments - Schedule of Unamortized Capitalized Fee Income (Details) - USD ($) $ in Millions |
Jun. 30, 2024 |
Dec. 31, 2023 |
|---|---|---|
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Total Unamortized Fee Income | $ 48.6 | $ 42.3 |
| Offset against debt investment cost | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Total Unamortized Fee Income | 38.1 | 32.9 |
| Deferred obligation contingent on funding or other milestone | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Total Unamortized Fee Income | $ 10.5 | $ 9.4 |