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Investments - Schedule of Unamortized Capitalized Fee Income (Details) - USD ($) $ in Millions	12 Months Ended
	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

Unamortized Fee Income

+ References

No definition available.

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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

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