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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
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Statement of Financial Position [Abstract] |  |
Fixed maturities available-for-sale, amortized cost | $ 645.4 | $ 673.5
Short -term investments, cost | 73.4 | 99.9
Premium receivable, allowance for doubtful accounts | $ 2.5 | $ 2.7
Common stock, par value (usd per share) | $ 0.00001 | $ 0.00001
Common stock, authorized (in shares) | 200,000,000 | 200,000,000
Common stock, issued (in shares) | 69,909,356 | 69,275,030
Common stock, outstanding (in shares) | 69,909,356 | 69,275,030

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