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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Statement of Financial Position [Abstract]    
Fixed maturities available-for-sale, amortized cost $ 170.6 $ 164.6
Short-term investments, amortized cost 148.5 187.1
Accounts receivable, allowance $ 0.5 $ 0.5
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Common stock, shares authorized (in shares) 80,000,000 80,000,000
Common stock, shares issued (in shares) 24,891,528 24,148,308
Common stock, shares outstanding (in shares) 24,891,528 24,148,308