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Investments - Strategic Investment in Fortitude Re (Details)
$ in Millions
1 Months Ended
Jun. 02, 2020
Nov. 13, 2018
USD ($)
Dec. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
drawdown
May 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
Schedule of Equity Method Investments [Line Items]            
Investment       $ 2,652.5   $ 2,128.6
Fortitude Group Holdings, LLC            
Schedule of Equity Method Investments [Line Items]            
Number of drawdowns | drawdown       2    
Fortitude Group Holdings, LLC            
Schedule of Equity Method Investments [Line Items]            
Ownership percentage acquired   19.90%        
Payments to acquire equity method investments   $ 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       $ 7,600.0    
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]            
Investment, cost       465.4    
Investment       724.8    
Equity capital raised       2,000.0    
Carrying value of equity method investment and corresponding loss       $ 277.0    
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       10.50%