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SCHEDULE II - Condensed Financial Information of Registrant (Parent Company) - Balance Sheet (Parenthetical) (Details) - USD ($)
$ / shares in Units, $ in Millions
Dec. 31, 2024
Dec. 31, 2023
Condensed Financial Statements, Captions [Line Items]    
Fixed maturities, available for sale, amortized cost $ 25,264.3 $ 23,699.2
Common stock, par value (in USD per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 8,000,000,000 8,000,000,000
Common stock, shares issued (in shares) 101,618,957 109,357,540
Common stock, shares outstanding (in shares) 101,618,957 109,357,540
Parent Company    
Condensed Financial Statements, Captions [Line Items]    
Fixed maturities, available for sale, amortized cost $ 500.2 $ 0.0
Common stock, par value (in USD per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 8,000,000,000 8,000,000,000
Common stock, shares issued (in shares) 101,618,957 109,357,540
Common stock, shares outstanding (in shares) 101,618,957 109,357,540