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Investments - Investment in Fortitude (Details) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended
Mar. 31, 2024
Jun. 02, 2020
Nov. 13, 2018
May 31, 2023
May 31, 2022
Mar. 31, 2022
May 31, 2020
Jun. 30, 2023
Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]                  
Investment               $ 2,951.2 $ 2,922.0
Fortitude Group Holdings, LLC                  
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 Group Holdings, LLC | Carlyle FRL                  
Schedule of Equity Method Investments [Line Items]                  
Ownership interest transferred   19.90%              
Fortitude Group Holdings, LLC | Fortitude Re | Maximum                  
Schedule of Equity Method Investments [Line Items]                  
Committed capital               10,300.0  
Fortitude Group Holdings, LLC | Forecast                  
Schedule of Equity Method Investments [Line Items]                  
Purchase price adjustment, payable upon inability to make distribution $ 19.9                
Fortitude Group Holdings, LLC | Carlyle FRL                  
Schedule of Equity Method Investments [Line Items]                  
Ownership percentage acquired   51.60%              
Ownership percentage   71.50%              
Fortitude Group Holdings, LLC | T&D                  
Schedule of Equity Method Investments [Line Items]                  
Ownership percentage acquired   25.00%              
Fortitude Group Holdings, LLC | Carlyle FRL and T&D                  
Schedule of Equity Method Investments [Line Items]                  
Ownership percentage   96.50%              
Fortitude Re | Fortitude Group Holdings, LLC                  
Schedule of Equity Method Investments [Line Items]                  
Ownership percentage     100.00%            
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  
Investment               582.5  
Investment, cost               $ 564.7  
Carlyle FRL | Fortitude Group Holdings, LLC                  
Schedule of Equity Method Investments [Line Items]                  
Ownership percentage       10.50% 13.50%        
Carlyle FRL | Fortitude Group Holdings, LLC | Maximum                  
Schedule of Equity Method Investments [Line Items]                  
Ownership percentage         19.90%        
Carlyle FRL | Fortitude Group Holdings, LLC | Minimum                  
Schedule of Equity Method Investments [Line Items]                  
Ownership percentage         13.50%        
Carlyle FRL | T&D                  
Schedule of Equity Method Investments [Line Items]                  
Investment company, committed capital           $ 100.0