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Investments - Strategic Investment in Fortitude (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Jun. 02, 2020
Nov. 13, 2018
Dec. 31, 2023
May 31, 2022
Mar. 31, 2022
May 31, 2020
Mar. 31, 2023
Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]                
Investment             $ 2,915.6 $ 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 | Fortitude Re | Maximum                
Schedule of Equity Method Investments [Line Items]                
Committed capital             9,600.0  
Fortitude Group Holdings, LLC | Carlyle FRL                
Schedule of Equity Method Investments [Line Items]                
Ownership interest transferred 19.90%              
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       $ 1,100.0 $ 2,000.0      
Investment loss       $ 176.9     117.0  
Investment             619.7  
Investment, cost             $ 514.7  
Carlyle FRL | Fortitude Group Holdings, LLC                
Schedule of Equity Method Investments [Line Items]                
Business acquisition further decrease funding percentage             10.50%  
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