CONSOLIDATED BALANCE SHEETS (Parenthetical) shares in Millions, $ in Millions	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares
Amortized cost, fixed maturities | $	$ 134.2	$ 129.5
Amortized cost, short term investments | $	0.4	0.0
Allowance for premiums receivable | $	2.8	5.4
Allowance for credit loss | $	$ 0.2	$ 0.2
Preferred stock, par value (in dollars per share) | $ / shares	$ 0.0001	$ 0.0001
Preferred stock, issued (in shares)	14.1	14.1
Preferred stock, outstanding (in shares)	14.1	14.1
Preferred stock, liquidation preference | $	$ 126.5	$ 126.5
Class A Shares
Common stock, par value (in dollars per share) | $ / shares	$ 0.0001	$ 0.0001
Common stock, shares issued (in shares)	9.2	7.9
Common stock, shares outstanding (in shares)	9.2	7.9
Class B Shares
Common stock, par value (in dollars per share) | $ / shares	$ 0.0001	$ 0.0001
Common stock, shares issued (in shares)	5.0	6.1
Common stock, shares outstanding (in shares)	5.0	6.1