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Investments - Schedule of Unamortized Capitalized Fee Income (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Unamortized Fee Income | $ 56.7 | $ 54.0
Included in Cost |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Unamortized Fee Income | 44.6 | 43.1
Deferred Fees |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Unamortized Fee Income | $ 12.1 | $ 10.9

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