Quarterly report pursuant to Section 13 or 15(d)

Investments - Schedule of Unamortized Capitalized Fee Income (Details)

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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