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Investments - Schedule of Unamortized Capitalized Fee Income (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Unamortized Fee Income | $ 46.0 | $ 42.3
Offset against debt investment cost |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Unamortized Fee Income | 36.9 | 32.9
Deferred obligation contingent on funding or other milestone |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Unamortized Fee Income | $ 9.1 | $ 9.4

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 20 -Name Accounting Standards Codification -Section 40 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481628/310-20-40-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481990/310-10-45-2 + Details
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