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Investments - Investment in Fortitude (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Mar. 31, 2024
Jun. 02, 2020
Nov. 13, 2018
Oct. 31, 2023
May 31, 2023
May 31, 2022
Mar. 31, 2022
May 31, 2020
Dec. 31, 2023
Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]                    
Total                 $ 3,024.1 $ 2,922.0
Fortitude Re | Fortitude Holdings                    
Schedule of Equity Method Investments [Line Items]                    
Percentage ownership     100.00%              
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    
Fortitude Holdings | Scenario, Forecast                    
Schedule of Equity Method Investments [Line Items]                    
Purchase price adjustment, payable upon inability to make distribution $ 19.9                  
Fortitude Holdings | Carlyle FRL                    
Schedule of Equity Method Investments [Line Items]                    
Ownership percentage acquired   51.60%   38.50%     96.50%      
Percentage ownership   71.50%                
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                 17,500.0  
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           $ 176.9     104.0  
Total                 595.4  
Investment cost                 $ 564.7  
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