CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Investments
Fixed maturities available-for-sale, at fair value (amortized cost: $6.4 million and $5.8 million as of December 31, 2020 and 2019 )	$ 6.6	$ 5.9
Short-term investments	0.0	54.7
Total investments	6.6	60.6
Cash, cash equivalents and restricted cash	571.4	270.3
Premium receivable, net of allowance for doubtful accounts of $0.5 million and $0.2 million as of December 31, 2020 and 2019	86.1	54.1
Reinsurance recoverable	49.0	20.3
Prepaid reinsurance premium	91.3	1.0
Deferred acquisition costs	3.5	1.8
Property and equipment, net	5.7	3.1
Intangible assets	0.6	0.6
Other assets	14.5	2.5
Total assets	828.7	414.3
Liabilities, Convertible Preferred Stock and Stockholders' Equity (Deficit)
Unpaid losses and loss adjustment expenses	46.3	28.2
Unearned premium	123.8	68.0
Trade payables	1.4	0.7
Funds held for reinsurance treaties	62.1	0.0
Other liabilities and accrued expenses	54.1	19.7
Total liabilities	287.7	116.6
Commitments and contingencies (Note 20)
Convertible preferred stock (Series Seed, A, B, C, and D), $0.00001 par value; no shares issued, authorized and outstanding as of December 31, 2020; 31,557,107 shares authorized, issued and outstanding as of December 31, 2019; aggregate liquidation preference of $0.0 million and $480.8 million on as of December 31, 2020 and 2019, respectively	0.0	480.2
Stockholders' equity (deficit):
Common stock, $0.00001 par value, 200,000,000 shares and 52,000,000 shares authorized as of December 31, 2020 and 2019 , respectively; 56,774,294 shares and 11,784,765 shares issued and 56,774,294 shares and 11,271,228 shares outstanding as of December 31, 2020 and 2019, respectively	0.0	0.0
Additional paid-in capital	859.8	15.7
Accumulated deficit	(320.6)	(198.3)
Accumulated other comprehensive income	1.8	0.1
Total stockholders' equity (deficit)	541.0	(182.5)
Total liabilities, convertible preferred stock and stockholders' equity (deficit)	$ 828.7	$ 414.3