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CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
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Statement of Financial Position [Abstract] |  |
Fixed maturities, available for sale, amortized cost | $ 5,712.7 | $ 5,756.9
Preferred stock, par value (in usd per share) | $ 0.001 | $ 0.001
Preferred stock, shares authorized (in shares) | 1,000,000 | 1,000,000
Preferred stock, shares issued (in shares) | 0 | 0
Common stock, par value (in usd per share) | $ 0.001 | $ 0.001
Common stock, shares authorized (in shares) | 75,000,000 | 75,000,000
Common stock, shares issued (in shares) | 66,745,445 | 66,618,465
Treasury stock (in shares) | 25,878,087 | 25,714,153

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