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Investments - Narrative (Details)
$ in Millions
3 Months Ended
Mar. 31, 2026
USD ($)
investment
Dec. 31, 2025
USD ($)
investment
Investment [Line Items]    
Percentage of securities representing gross unrealized losses 7.00% 9.00%
Percentage of gross unrealized losses in a continuous loss position less than twelve months 20.00% 8.00%
Individual securities comprising total gross unrealized losses | investment 2,423 1,827
Approximate percentage, outstanding principal balance of commercial mortgage loans 34.00%  
Minimum    
Investment [Line Items]    
Outstanding balance of commercial mortgage loans (less than) $ 0.1 $ 0.1
Maximum    
Investment [Line Items]    
Outstanding balance of commercial mortgage loans (less than) $ 4.9 $ 5.0