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Borrowings - CLO Borrowings (Details)
€ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2022
EUR (€)
Feb. 05, 2019
EUR (€)
Feb. 28, 2017
EUR (€)
Debt Instrument [Line Items]            
Borrowing Outstanding $ 6,083.2 $ 5,903.0        
Interest 110.4 113.3 $ 94.0      
Borrowing Outstanding $ 2,296.7 2,097.6        
LIBOR rate            
Debt Instrument [Line Items]            
Applicable margin over base rate 1.50%          
CLO Term Loan Maturing November 17, 2031            
Debt Instrument [Line Items]            
Borrowing Outstanding $ 38.7 51.3   € 36.1    
Borrowing Outstanding | €       € 38.7   € 36.1
CLO Term Loan Maturing November 17, 2031 | Euribor            
Debt Instrument [Line Items]            
Interest Rate 2.40%     2.40%    
Interest rate at end of period 2.40%     2.40%    
CLO Term Loan June 2017 Maturing July 20, 2030            
Debt Instrument [Line Items]            
Borrowing Outstanding $ 54.8 $ 0.0        
CLO Term Loan June 2017 Maturing July 20, 2030 | LIBOR rate            
Debt Instrument [Line Items]            
Interest Rate 5.89%     5.89%    
Applicable margin over base rate   1.65%        
CLO Term Loan December 2017 Maturing January 15, 2031            
Debt Instrument [Line Items]            
Borrowing Outstanding $ 43.8 $ 0.0        
CLO Term Loan December 2017 Maturing January 15, 2031 | LIBOR rate            
Debt Instrument [Line Items]            
Interest Rate 5.45%     5.45%    
Applicable margin over base rate   1.37%        
CLO Term Loan March 2019 Maturing March 2032            
Debt Instrument [Line Items]            
Borrowing Outstanding $ 1.8 $ 1.9        
CLO Term Loan March 2019 Maturing March 2032 | Average effective interest rate            
Debt Instrument [Line Items]            
Interest Rate 10.15%     10.15%    
CLO Term Loan August 2019 Maturing August 2032            
Debt Instrument [Line Items]            
Borrowing Outstanding $ 3.9 4.1        
CLO Term Loan August 2019 Maturing August 2032 | Average effective interest rate            
Debt Instrument [Line Items]            
Interest Rate 6.53%     6.53%    
CLO Term Loan September 2020 Maturing April 2033            
Debt Instrument [Line Items]            
Borrowing Outstanding $ 19.1 20.3        
CLO Term Loan September 2020 Maturing April 2033 | Average effective interest rate            
Debt Instrument [Line Items]            
Interest Rate 2.96%     2.96%    
CLO Term Loan 2021 Maturing January 2034            
Debt Instrument [Line Items]            
Borrowing Outstanding $ 19.9 21.3        
CLO Term Loan 2021 Maturing January 2034 | Average effective interest rate            
Debt Instrument [Line Items]            
Interest Rate 3.87%     3.87%    
CLO Term Loan Maturing August 15, 2030            
Debt Instrument [Line Items]            
Borrowing Outstanding $ 19.1 20.3        
CLO Term Loan Maturing August 15, 2030 | Average effective interest rate            
Debt Instrument [Line Items]            
Interest Rate 3.17%     3.17%    
CLO Term Loan March 2021 Maturing March 2032            
Debt Instrument [Line Items]            
Borrowing Outstanding $ 18.0 19.1        
CLO Term Loan March 2021 Maturing March 2032 | Average effective interest rate            
Debt Instrument [Line Items]            
Interest Rate 3.75%     3.75%    
CLO Term Loan 2021 Maturing April 2033            
Debt Instrument [Line Items]            
Borrowing Outstanding $ 3.4 3.7        
CLO Term Loan 2021 Maturing April 2033 | Average effective interest rate            
Debt Instrument [Line Items]            
Interest Rate 7.23%     7.23%    
CLO Term Loan May 2021 Maturing November 2031            
Debt Instrument [Line Items]            
Borrowing Outstanding $ 15.0 15.9        
CLO Term Loan May 2021 Maturing November 2031 | Euribor            
Debt Instrument [Line Items]            
Interest Rate 3.16%     3.16%    
CLO Term Loan June 2021 Maturing January 2034            
Debt Instrument [Line Items]            
Borrowing Outstanding $ 20.0 21.3        
CLO Term Loan June 2021 Maturing January 2034 | Average effective interest rate            
Debt Instrument [Line Items]            
Interest Rate 3.66%     3.66%    
CLO Term Loan June 2021 Maturing November 2031            
Debt Instrument [Line Items]            
Borrowing Outstanding $ 1.3 1.4        
CLO Term Loan June 2021 Maturing November 2031 | Average effective interest rate            
Debt Instrument [Line Items]            
Interest Rate 4.65%     4.65%    
CLO Term Loan July 2021 Maturing July 2034            
Debt Instrument [Line Items]            
Borrowing Outstanding $ 15.0 0.0        
CLO Term Loan July 2021 Maturing July 2034 | Average effective interest rate            
Debt Instrument [Line Items]            
Interest Rate 3.67%     3.67%    
CLO Term Loan July 2021 Maturing July 2031            
Debt Instrument [Line Items]            
Borrowing Outstanding $ 20.0 0.0        
CLO Term Loan July 2021 Maturing July 2031 | Average effective interest rate            
Debt Instrument [Line Items]            
Interest Rate 3.73%     3.73%    
CLO Term Loan August 2021 Maturing August 2032            
Debt Instrument [Line Items]            
Borrowing Outstanding $ 16.2 17.2        
CLO Term Loan August 2021 Maturing August 2032 | Average effective interest rate            
Debt Instrument [Line Items]            
Interest Rate 3.54%     3.54%    
CLO Term Loan October 2021 Maturing October 2035            
Debt Instrument [Line Items]            
Borrowing Outstanding $ 23.3 24.8        
CLO Term Loan October 2021 Maturing October 2035 | Average effective interest rate            
Debt Instrument [Line Items]            
Interest Rate 3.78%     3.78%    
CLO Term Loan November 2021 Maturing January 2034            
Debt Instrument [Line Items]            
Borrowing Outstanding $ 13.8 0.0        
CLO Term Loan November 2021 Maturing January 2034 | Average effective interest rate            
Debt Instrument [Line Items]            
Interest Rate 3.46%     3.46%    
CLO Term Loan January 2022 Maturing February 2035            
Debt Instrument [Line Items]            
Borrowing Outstanding $ 20.1 0.0        
CLO Term Loan January 2022 Maturing February 2035 | Average effective interest rate            
Debt Instrument [Line Items]            
Interest Rate 4.18%     4.18%    
CLO Term Loan February 2022 Maturing November 2035            
Debt Instrument [Line Items]            
Borrowing Outstanding $ 20.1 0.0        
CLO Term Loan February 2022 Maturing November 2035 | Average effective interest rate            
Debt Instrument [Line Items]            
Interest Rate 4.24%     4.24%    
CLO Term Loan July 2022 Maturing January 2035            
Debt Instrument [Line Items]            
Borrowing Outstanding $ 16.9 0.0        
CLO Term Loan July 2022 Maturing January 2035 | Average effective interest rate            
Debt Instrument [Line Items]            
Interest Rate 3.61%     3.61%    
CLO Term Loan October 2022 Maturing October 2035            
Debt Instrument [Line Items]            
Borrowing Outstanding $ 17.5 0.0        
CLO Term Loan October 2022 Maturing October 2035 | Average effective interest rate            
Debt Instrument [Line Items]            
Interest Rate 5.62%     5.62%    
CLO Term Loans            
Debt Instrument [Line Items]            
Borrowing Outstanding $ 421.7 222.6        
Interest 10.7 5.6 $ 8.5      
Borrowing Outstanding 421.7 $ 222.6        
CLO Term Loan Various | Average effective interest rate            
Debt Instrument [Line Items]            
Applicable margin over base rate   0.50%        
Master Credit Agreements - Term Loans            
Debt Instrument [Line Items]            
Outstanding borrowing 98.6          
CLO Financing Facility            
Debt Instrument [Line Items]            
Outstanding borrowing 218.0     € 203.6    
Borrowing capacity | €         € 100.0  
CBAM CLO Financing Facility            
Debt Instrument [Line Items]            
Outstanding borrowing $ 66.3     61.9    
Borrowing capacity | €       € 100.0