XML 77 R60.htm IDEA: XBRL DOCUMENT v3.25.3
Investments - Investment in Fortitude (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Sep. 30, 2025
Nov. 30, 2024
Oct. 31, 2023
May 31, 2023
Mar. 31, 2022
Jun. 30, 2020
May 31, 2020
Nov. 30, 2018
Dec. 31, 2024
Schedule of Equity Method Investments [Line Items]                  
Investment $ 2,942.5               $ 3,292.3
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 300.0 $ 200.0              
Principal investment income   7.9              
Fortitude Group Holdings, LLC | Fortitude Re | Maximum                  
Schedule of Equity Method Investments [Line Items]                  
Committed capital 23,300.0                
Fortitude Group Holdings, LLC | Carlyle FRL                  
Schedule of Equity Method Investments [Line Items]                  
Ownership interest transferred (as percent)           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 31.4 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 739.5                
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