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Investments - Schedule of Unamortized Capitalized Fee Income (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Unamortized Fee Income | $ 47.6 | $ 42.3
Included in Cost |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Unamortized Fee Income | 37.0 | 32.9
Deferred Fees |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Unamortized Fee Income | $ 10.6 | $ 9.4

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