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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
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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

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