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Investments - Investment in Fortitude (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Nov. 30, 2024
Oct. 31, 2023
May 31, 2023
Mar. 31, 2022
Jun. 30, 2020
May 31, 2020
Nov. 30, 2018
Dec. 31, 2024
Mar. 31, 2025
Schedule of Equity Method Investments [Line Items]                  
Investment               $ 3,292.3 $ 3,153.2
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  
Dividends $ 200.0                
Principal investment income 7.9                
Fortitude Group Holdings, LLC | Fortitude Re | Maximum                  
Schedule of Equity Method Investments [Line Items]                  
Committed capital                 20,600.0
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   38.50%   97.50% 51.60%        
Ownership percentage         71.50%        
Dividends 76.9                
Distribution received $ 21.0                
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       $ 2,000.0          
Investment                 737.4
Investment, cost                 $ 666.8
Carlyle FRL | Fortitude Group Holdings, LLC                  
Schedule of Equity Method Investments [Line Items]                  
Ownership percentage     10.50%            
Carlyle FRL | T&D                  
Schedule of Equity Method Investments [Line Items]                  
Investment company, committed capital       $ 100.0