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Related-Party Transactions - Management Agreement (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Related-Party Transactions      
Granted (in shares) 2,570,052    
Manager Equity Plan      
Related-Party Transactions      
Granted (in shares) 1,350,000    
Employee Stock      
Related-Party Transactions      
Share-based expense $ 0.2 $ 0.3  
S P T Management L L C      
Related-Party Transactions      
Management fee expense 23.4 21.9  
Base management fee payable 23.4   $ 23.5
Accrued incentive fee 10.1 19.1  
Unpaid incentive fee 10.1   12.7
Executive compensation expense 1.2 $ 0.5  
Unpaid reimbursable compensation $ 3.0   $ 2.7
S P T Management L L C | Restricted Stock Awards      
Related-Party Transactions      
Granted (in shares) 416,780 924,092  
Grant date values $ 8.4 $ 18.8  
Share-based expense $ 2.4 1.5  
S P T Management L L C | Restricted Stock Awards | Manager Equity Plan      
Related-Party Transactions      
Vesting Period 3 years    
S P T Management L L C | Employee Stock      
Related-Party Transactions      
Share-based expense $ 0.0 $ 0.0