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Secured Debt Arrangements, Net - Additional Information (Details)
£ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
Dec. 31, 2024
GBP (£)
Dec. 31, 2023
USD ($)
Jun. 30, 2025
Sep. 30, 2024
USD ($)
Jun. 30, 2024
USD ($)
Line of Credit Facility [Line Items]            
Weighted average haircut under repurchase agreements 31.40%   31.60%      
Long-term line of credit $ 462,900,000   $ 669,300,000      
Debt instrument, covenant, interest coverage ratio, minimum 1.3       1.3  
Maximum interest coverage ratio 3.75          
Forecast            
Line of Credit Facility [Line Items]            
Debt instrument, covenant, interest coverage ratio, minimum       1.4    
Line of Credit            
Line of Credit Facility [Line Items]            
Line of credit facility, increase (decrease), net $ 458,800,000 £ 366.6        
Barclays Securitization | Line of Credit | VIE            
Line of Credit Facility [Line Items]            
Deferring or waiving debt service payments, term 18 months 18 months        
Revolving Credit Facility | Line of Credit            
Line of Credit Facility [Line Items]            
Long-term line of credit $ 0   147,000,000      
Line of credit facility, commitment fee amount $ 281,400   282,800      
Revolving Credit Facility | 2023 Revolving Credit Facility | Line of Credit            
Line of Credit Facility [Line Items]            
Recourse, percentage 5.00%          
Minimum unrestricted cash $ 30,000,000          
Net cash proceeds of additional equity issuances, amount $ 1,250,000,000          
Tangible net worth, percentage 75.00%          
Revolving Credit Facility | 2023 Revolving Credit Facility | Bank of America, N.A.            
Line of Credit Facility [Line Items]            
Maximum amount of borrowings         $ 160,000,000 $ 170,000,000
Revolving Credit Facility | 2023 Revolving Credit Facility | Bank of America, N.A. | Line of Credit            
Line of Credit Facility [Line Items]            
Maximum amount of borrowings $ 160,000,000          
Maturity term 3 years 3 years        
Line of credit facility, qualifying commercial loan borrowings, term 2 years 2 years        
Line of credit facility, real property owned asset borrowings, term 6 months 6 months        
Line of credit facility, commitment fee amount $ 2,400,000          
Line of credit facility, periodic payment, interest     $ 168,300      
Atlas Facility | Two Existing Credit Facilities | Line of Credit            
Line of Credit Facility [Line Items]            
Line of credit facility, increase (decrease), net 113,500,000          
Barclays Facility | Two Existing Credit Facilities | Line of Credit            
Line of Credit Facility [Line Items]            
Line of credit facility, increase (decrease), net $ 300,000,000