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Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total investments at fair value $ 2,272.9 $ 2,180.6
Total Investments at fair value, estimated fair value 2,272.9 2,180.6
Cash and cash equivalents 95.5 226.4
Cash and cash equivalents, estimated fair value 95.5 226.4
Restricted cash and cash equivalents 0.2 0.2
Estimate of Fair Value, Fair Value Disclosure [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Restricted cash and cash equivalents $ 0.2 $ 0.2