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Investments - Investment in Fortitude (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jun. 02, 2020
Nov. 13, 2018
Nov. 30, 2024
Oct. 31, 2023
May 31, 2023
May 31, 2022
Mar. 31, 2022
May 31, 2020
Dec. 31, 2024
Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]                    
Dividend paid                 $ 3,292.3 $ 3,024.1
Fortitude Holdings                    
Schedule of Equity Method Investments [Line Items]                    
Ownership percentage acquired   19.90%                
Purchase of investment in Fortitude Re   $ 381.0                
Deferred consideration, maximum                 95.0  
Purchase price adjustment, maximum               $ 99.5    
Purchase price adjustment, payable upon inability to make distribution               $ 79.6 19.9  
Dividends     $ 200.0              
Principal investment income     7.9              
Fortitude Holdings | Carlyle FRL                    
Schedule of Equity Method Investments [Line Items]                    
Ownership percentage acquired 51.60%     38.50%     97.50%      
Percentage ownership 71.50%                  
Dividends     76.9              
Distribution received     $ 21.0              
Fortitude Holdings | T&D United Capital Co Ltd                    
Schedule of Equity Method Investments [Line Items]                    
Ownership percentage acquired 25.00%                  
Fortitude Holdings | Carlyle FRL and T&D                    
Schedule of Equity Method Investments [Line Items]                    
Percentage ownership 96.50%                  
Fortitude Holdings | Fortitude Re | Maximum                    
Schedule of Equity Method Investments [Line Items]                    
Committed capital                 19,400.0  
Fortitude Holdings | Carlyle FRL                    
Schedule of Equity Method Investments [Line Items]                    
Ownership interest transferred 19.90%                  
Carlyle FRL                    
Schedule of Equity Method Investments [Line Items]                    
Equity capital raised         $ 1,000.0 $ 1,100.0 $ 2,000.0      
Investment loss         $ 104.0 $ 176.9        
Dividend paid                 723.5  
Investment cost                 $ 666.8  
Carlyle FRL | Fortitude Holdings                    
Schedule of Equity Method Investments [Line Items]                    
Percentage ownership         10.50% 13.50%        
Carlyle FRL | Fortitude Holdings | Maximum                    
Schedule of Equity Method Investments [Line Items]                    
Percentage ownership           19.90%        
Carlyle FRL | Fortitude Holdings | Minimum                    
Schedule of Equity Method Investments [Line Items]                    
Percentage ownership           13.50%        
Carlyle FRL | T&D United Capital Co Ltd                    
Schedule of Equity Method Investments [Line Items]                    
Percentage committed capital             $ 100.0      
Fortitude Re | Fortitude Holdings                    
Schedule of Equity Method Investments [Line Items]                    
Percentage ownership   100.00%