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Borrowings - CLO Borrowings (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Dec. 31, 2023
CLO Term Loan February 2017 Maturing September 2029    
Debt Instrument [Line Items]    
Borrowing Outstanding $ 34.2 $ 39.9
CLO Term Loan February 2017 Maturing September 2029 | Euribor    
Debt Instrument [Line Items]    
Interest Rate 6.30%  
CLO Term Loan June 2017 Maturing July 20, 2030    
Debt Instrument [Line Items]    
Borrowing Outstanding $ 40.7 45.6
CLO Term Loan June 2017 Maturing July 20, 2030 | SOFR    
Debt Instrument [Line Items]    
Interest Rate 6.77%  
Margin spread on interest rate (percent) 1.45%  
CLO Term Loan December 2017 Maturing January 15, 2031    
Debt Instrument [Line Items]    
Borrowing Outstanding $ 38.5 41.1
CLO Term Loan December 2017 Maturing January 15, 2031 | SOFR    
Debt Instrument [Line Items]    
Interest Rate 6.97%  
Margin spread on interest rate (percent) 1.66%  
CLO Term Loan March 2019 Maturing March 2032    
Debt Instrument [Line Items]    
Borrowing Outstanding $ 1.8 1.8
CLO Term Loan March 2019 Maturing March 2032 | Average Effective Interest Rate    
Debt Instrument [Line Items]    
Interest Rate 12.05%  
CLO Term Loan August 2019 Maturing August 2032    
Debt Instrument [Line Items]    
Borrowing Outstanding $ 3.9 4.0
CLO Term Loan August 2019 Maturing August 2032 | Average Effective Interest Rate    
Debt Instrument [Line Items]    
Interest Rate 8.64%  
CLO Term Loan September 2020 Maturing April 2033    
Debt Instrument [Line Items]    
Borrowing Outstanding $ 19.2 19.7
CLO Term Loan September 2020 Maturing April 2033 | Average Effective Interest Rate    
Debt Instrument [Line Items]    
Interest Rate 5.53%  
CLO Term Loan Maturing January 2034    
Debt Instrument [Line Items]    
Borrowing Outstanding $ 20.1 20.6
CLO Term Loan Maturing January 2034 | Average Effective Interest Rate    
Debt Instrument [Line Items]    
Interest Rate 6.44%  
CLO Term Loan Maturing August 2030    
Debt Instrument [Line Items]    
Borrowing Outstanding $ 14.8 16.8
CLO Term Loan Maturing August 2030 | Average Effective Interest Rate    
Debt Instrument [Line Items]    
Interest Rate 5.34%  
CLO Term Loan March 2021 Maturing March 2032    
Debt Instrument [Line Items]    
Borrowing Outstanding $ 18.0 18.6
CLO Term Loan March 2021 Maturing March 2032 | Average Effective Interest Rate    
Debt Instrument [Line Items]    
Interest Rate 5.65%  
CLO Term Loan Maturing April 2033    
Debt Instrument [Line Items]    
Borrowing Outstanding $ 3.5 3.6
CLO Term Loan Maturing April 2033 | Average Effective Interest Rate    
Debt Instrument [Line Items]    
Interest Rate 9.79%  
CLO Term Loan May2021 Maturing November2031    
Debt Instrument [Line Items]    
Borrowing Outstanding $ 15.1 15.5
CLO Term Loan May2021 Maturing November2031 | Average Effective Interest Rate    
Debt Instrument [Line Items]    
Interest Rate 5.27%  
CLO Term Loan June 2021 Maturing January 2034    
Debt Instrument [Line Items]    
Borrowing Outstanding $ 20.2 20.7
CLO Term Loan June 2021 Maturing January 2034 | Average Effective Interest Rate    
Debt Instrument [Line Items]    
Interest Rate 6.22%  
CLO Term Loan Maturing November 2031    
Debt Instrument [Line Items]    
Borrowing Outstanding $ 1.3 1.3
CLO Term Loan Maturing November 2031 | Average Effective Interest Rate    
Debt Instrument [Line Items]    
Interest Rate 6.75%  
CLO Term Loan July 2021 Maturing July 15, 2034    
Debt Instrument [Line Items]    
Borrowing Outstanding $ 15.1 15.5
CLO Term Loan July 2021 Maturing July 15, 2034 | Average Effective Interest Rate    
Debt Instrument [Line Items]    
Interest Rate 6.23%  
CLO Term Loan July 2021 Maturing July 20, 2031    
Debt Instrument [Line Items]    
Borrowing Outstanding $ 20.1 20.6
CLO Term Loan July 2021 Maturing July 20, 2031 | Average Effective Interest Rate    
Debt Instrument [Line Items]    
Interest Rate 6.25%  
CLO Term Loan August 2021 Maturing August 2032    
Debt Instrument [Line Items]    
Borrowing Outstanding $ 16.3 16.7
CLO Term Loan August 2021 Maturing August 2032 | Average Effective Interest Rate    
Debt Instrument [Line Items]    
Interest Rate 5.65%  
CLO Term Loan October 2021 Maturing October 2035    
Debt Instrument [Line Items]    
Borrowing Outstanding $ 23.4 24.0
CLO Term Loan October 2021 Maturing October 2035 | Average Effective Interest Rate    
Debt Instrument [Line Items]    
Interest Rate 6.35%  
CLO Term Loan November 2021 Maturing January 2034    
Debt Instrument [Line Items]    
Borrowing Outstanding $ 14.0 14.3
CLO Term Loan November 2021 Maturing January 2034 | Average Effective Interest Rate    
Debt Instrument [Line Items]    
Interest Rate 6.03%  
CLO Term Loan January 2022 Maturing February 15, 2035    
Debt Instrument [Line Items]    
Borrowing Outstanding $ 20.2 20.7
CLO Term Loan January 2022 Maturing February 15, 2035 | Average Effective Interest Rate    
Debt Instrument [Line Items]    
Interest Rate 6.28%  
CLO Term Loan February 2022 Maturing November 10, 2035    
Debt Instrument [Line Items]    
Borrowing Outstanding $ 20.3 20.8
CLO Term Loan February 2022 Maturing November 10, 2035 | Average Effective Interest Rate    
Debt Instrument [Line Items]    
Interest Rate 6.35%  
CLO Term Loan July 2022 Maturing January 13, 2035    
Debt Instrument [Line Items]    
Borrowing Outstanding $ 17.0 17.5
CLO Term Loan July 2022 Maturing January 13, 2035 | Average Effective Interest Rate    
Debt Instrument [Line Items]    
Interest Rate 7.26%  
CLO Term Loan October 2022 Maturing October 2035    
Debt Instrument [Line Items]    
Borrowing Outstanding $ 17.7 18.1
CLO Term Loan October 2022 Maturing October 2035 | Average Effective Interest Rate    
Debt Instrument [Line Items]    
Interest Rate 7.69%  
CLO Term Loan September 2023 Maturing August 2031    
Debt Instrument [Line Items]    
Borrowing Outstanding $ 12.7 14.3
CLO Term Loan September 2023 Maturing August 2031 | Average Effective Interest Rate    
Debt Instrument [Line Items]    
Interest Rate 5.47%  
CLO Borrowings    
Debt Instrument [Line Items]    
Borrowing Outstanding $ 408.1 $ 431.7
CLO Term Loan Various | Average Effective Interest Rate    
Debt Instrument [Line Items]    
Margin spread on interest rate (percent) 0.50%