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Related Party Transactions - Narrative (Details)
 12 Months Ended
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Related Party Transaction [Line Items]      
Plus component of annual investment management fee 0.25    
Annual fee cap 0.15    
Privately-held Investments $ 286,800,000 $ 475,000,000.0  
Other Investments 267,200,000 209,300,000  
Net investment income (1) 318,000,000.0 275,700,000 $ 188,100,000
Accrued expenses and other payables 237,200,000 214,400,000  
Gain (loss) on investments 52,600,000 75,900,000 5,000,000.0
Other expenses 0 0 20,100,000
Asset Management Arrangement      
Related Party Transaction [Line Items]      
Net investment income (1) 9,200,000 9,400,000 4,900,000
Accrued expenses and other payables 4,000,000.0 2,100,000  
Apollo real estate fund      
Related Party Transaction [Line Items]      
Gain (loss) on investments 400,000 (400,000) 3,100,000
Apollo real estate fund | Fair Value, Recurring [Member]      
Related Party Transaction [Line Items]      
Other Investments 78,600,000    
Beneficial owner      
Related Party Transaction [Line Items]      
Accounts Payable, Current 1,200,000 1,200,000  
Funds managed by Apollo | Fair Value, Recurring [Member]      
Related Party Transaction [Line Items]      
Other Investments 78,600,000 39,800,000  
Apollo Notes, SPV      
Related Party Transaction [Line Items]      
Privately-held investment, losses incurred (5,500,000) (5,500,000) (400,000)
Apollo Notes, SPV | Fair Value, Recurring [Member]      
Related Party Transaction [Line Items]      
Privately-held Investments 66,600,000 82,200,000  
CLOs      
Related Party Transaction [Line Items]      
Net investment income (1) 11,300,000 17,400,000 0
CLOs | Fair Value, Recurring [Member]      
Related Party Transaction [Line Items]      
Debt Securities, Trading 88,900,000 129,800,000  
Middle Market Term Loans managed by a subsidiary of Apollo      
Related Party Transaction [Line Items]      
Net investment income (1) 500,000 5,800,000 $ 0
Middle Market Term Loans managed by a subsidiary of Apollo | Fair Value, Recurring [Member]      
Related Party Transaction [Line Items]      
Debt Securities, Trading $ 7,000,000.0 $ 45,100,000  
Maximum      
Related Party Transaction [Line Items]      
Percentage of consolidated group's net income due to Apollo Management 1.00%    
Dollar amount option to percentage fee $ 5,000,000