CONSOLIDATED BALANCE SHEETS - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Investments:
Fixed maturities available-for-sale, at fair value (amortized cost: $129.5 and $215.4 at December 31, 2021 and December 31, 2020, respectively)	$ 129,900,000	$ 221,000,000.0
Short-term investments (amortized cost: zero and $3.0 at December 31, 2021 and December 31, 2020, respectively)	0	3,000,000.0
Other investments	4,700,000	500,000
Total investments	134,600,000	224,500,000
Cash and cash equivalents	706,000,000.0	1,112,800,000
Restricted cash	1,000,000.0	1,000,000.0
Premiums receivable, net of allowance of $5.4 and $3.5 at December 31, 2021 and December 31, 2020, respectively	148,100,000	130,100,000
Reinsurance recoverable, net of allowance of $0.2 and zero at December 31, 2021 and December 31, 2020, respectively	155,000,000.0	124,800,000
Prepaid reinsurance premiums	100,800,000	112,800,000
Other assets	73,800,000	56,300,000
Total assets	1,319,300,000	1,762,300,000
Liabilities:
Loss and loss adjustment expense reserves	320,200,000	237,200,000
Unearned premiums	180,100,000	157,100,000
Long-term debt and warrants	0	188,200,000
Reinsurance premiums payable	101,600,000	89,100,000
Accounts payable and accrued expenses	29,100,000	48,000,000.0
Other liabilities	39,900,000	10,300,000
Total liabilities	670,900,000	729,900,000
Commitments and Contingencies (Note 12)
Redeemable convertible preferred stock, $0.0001 par value, 14.1 and zero shares issued and outstanding at December 31, 2021 and December 31, 2020, respectively (liquidation preference of $126.5 and zero, respectively) (Note 10)	112,000,000.0	0
Stockholders’ equity:
Treasury stock, at cost	0	(800,000)
Additional paid-in capital	1,806,100,000	1,775,600,000
Accumulated other comprehensive income	400,000	5,600,000
Accumulated loss	(1,270,100,000)	(748,000,000.0)
Total stockholders’ equity	536,400,000	1,032,400,000
Total liabilities, redeemable convertible preferred stock and stockholders’ equity	1,319,300,000	1,762,300,000
Class A Common Stock
Stockholders’ equity:
Common stock	0	0
Class B Common Stock
Stockholders’ equity:
Common stock	$ 0	$ 0