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Investments - Investment in Fortitude (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Jun. 02, 2020
Nov. 13, 2018
Oct. 31, 2023
May 31, 2023
May 31, 2022
Mar. 31, 2022
May 31, 2020
Mar. 31, 2024
Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]                  
Investment               $ 3,145.4 $ 3,024.1
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 19.9  
Fortitude Group Holdings, LLC | Fortitude Re | Maximum                  
Schedule of Equity Method Investments [Line Items]                  
Committed capital               17,900.0  
Fortitude Group Holdings, LLC | Carlyle FRL                  
Schedule of Equity Method Investments [Line Items]                  
Ownership interest transferred 19.90%                
Fortitude Group Holdings, LLC | Carlyle FRL                  
Schedule of Equity Method Investments [Line Items]                  
Ownership percentage acquired 51.60%   38.50%     97.50%      
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               709.3  
Investment, cost               $ 679.6  
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