v3.25.4
Reinsurance Contract Assets Held - Summary (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Jan. 01, 2025
Dec. 31, 2024
Jan. 01, 2024
Reinsurance Contract Assets Held        
Reinsurance contract assets held $ 11,251.0   $ 10,682.6  
ARC        
Reinsurance Contract Assets Held        
Reinsurance contract assets held 304.8   15.8  
AIC        
Reinsurance Contract Assets Held        
Reinsurance contract assets held 10,946.2   10,666.8  
PAA        
Reinsurance Contract Assets Held        
Reinsurance contract assets held 10,337.7 $ 9,757.2 9,757.2 $ 9,856.3
PAA | Life insurance and Run-off        
Reinsurance Contract Assets Held        
Reinsurance contract assets held 7.2 $ 8.9 8.9 $ 2.6
GMM        
Reinsurance Contract Assets Held        
Reinsurance contract assets held 913.3   925.4  
GMM | Global Insurers and Reinsurers        
Reinsurance Contract Assets Held        
Reinsurance contract assets held 245.7   261.3  
GMM | International Insurers and Reinsurers        
Reinsurance Contract Assets Held        
Reinsurance contract assets held 252.6      
GMM | Life insurance and Run-off        
Reinsurance Contract Assets Held        
Reinsurance contract assets held 415.0   $ 400.6  
GMM | Life insurance and Run-off | International Insurers and Reinsurers        
Reinsurance Contract Assets Held        
Reinsurance contract assets held $ 263.5