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Borrowings - UK Revolving Credit Facility (Details) - UK Credit Agreement
 3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
Sep. 30, 2023
USD ($)
Line of Credit Facility [Line Items]    
Consolidated senior secured leverage ratio 2.25 2.25
Unused portion $ 299,700,000 $ 299,700,000
Current borrowing capacity 57,400,000 57,400,000
Additional borrowing capacity $ 242,300,000 $ 242,300,000
Credit agreement consolidated leverage ratio 3.50 3.50
Eligible Core Asset Pool    
Line of Credit Facility [Line Items]    
Percentage of maximum level of borrowings of ERC of eligible asset pools 35.00%  
Eligible Insolvent Asset Pool    
Line of Credit Facility [Line Items]    
Percentage of maximum level of borrowings of ERC of insolvent asset pools 55.00%  
Maximum | Eurodollar Rate    
Line of Credit Facility [Line Items]    
Basis spread variable rate   2.50%
Debt Instrument, Basis Spread on Variable Rate, Credit Adjustment Spread   0.10%
Revolving Credit Facility | Line of Credit    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 800,000,000 $ 800,000,000
Line of credit facility, optional increase in borrowing capacity $ 200,000,000 $ 200,000,000
Revolving Credit Facility | Line of Credit | Maximum    
Line of Credit Facility [Line Items]    
Basis spread variable rate   2.75%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage   0.35%
Revolving Credit Facility | Line of Credit | Minimum    
Line of Credit Facility [Line Items]    
Consolidated senior secured leverage ratio 1.60 1.60
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage   0.30%