CONDENSED CONSOLIDATED BALANCE SHEETS - UNAUDITED (Parenthetical) - USD ($) shares in Millions, $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Amortized cost, fixed maturities	$ 264.1	$ 168.4
Amortized cost, short term investments	8.6	0.9
Allowance for premiums receivable	7.2	4.0
Allowance for credit loss	$ 1.8	$ 1.8
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	100.0	100.0
Preferred stock, shares issued (in shares)	14.1	14.1
Preferred stock, shares 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)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	1,000.0	1,000.0
Common stock, shares issued (in shares)	10.6	9.5
Common stock, shares outstanding (in shares)	10.6	9.5
Class B Shares
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	269.0	269.0
Common stock, shares issued (in shares)	4.4	5.0
Common stock, shares outstanding (in shares)	4.4	5.0