Root (ROOT) 10-Q 1 Nov 23 2023 Q3 Quarterly report Financial data

COVER PAGE

COVER PAGE - shares shares in Millions	9 Months Ended
	Sep. 30, 2023	Oct. 27, 2023
Entity Listings [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2023
Document Transition Report	false
Entity File Number	001-39658
Entity Registrant Name	ROOT, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	84-2717903
Entity Address, Address Line One	80 E. Rich Street
Entity Address, Address Line Two	Suite 500
Entity Address, City or Town	Columbus
Entity Address, State or Province	OH
Entity Address, Postal Zip Code	43215
City Area Code	866
Local Phone Number	980-9431
Title of 12(b) Security	Class A common stock,$0.0001 par value per share
Trading Symbol	ROOT
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Amendment Flag	false
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3
Entity Central Index Key	0001788882
Current Fiscal Year End Date	--12-31
Class A Shares
Entity Listings [Line Items]
Entity Common Stock, Shares Outstanding		9.6
Class B Shares
Entity Listings [Line Items]
Entity Common Stock, Shares Outstanding		5

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - UNAUDITED - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Investments:
Fixed maturities available-for-sale, at fair value (amortized cost: $171.1 and $134.2 at September 30, 2023 and December 31, 2022, respectively)	$ 164.5	$ 128.4
Short-term investments (amortized cost: $2.6 and $0.4 at September 30, 2023 and December 31, 2022, respectively)	2.6	0.4
Other investments	4.4	4.4
Total investments	171.5	133.2
Cash and cash equivalents	635.3	762.1
Restricted cash	1	1
Premiums receivable, net of allowance of $2.7 and $2.8 at September 30, 2023 and December 31, 2022, respectively	187.9	111.9
Reinsurance recoverable and receivable, net of allowance of $2.9 and $0.2 at September 30, 2023 and December 31, 2022, respectively	137.7	148.8
Prepaid reinsurance premiums	36.1	74.2
Other assets	70.7	81.7
Total assets	1,240.2	1,312.9
Liabilities:
Loss and loss adjustment expense reserves	256.5	287.4
Unearned premiums	218.9	136.5
Long-term debt and warrants	298.3	295.4
Reinsurance premiums payable	71.8	119.8
Accounts payable and accrued expenses	47.8	39.7
Other liabilities	57.8	45
Total liabilities	951.1	923.8
Commitments and Contingencies (Note 11)
Redeemable convertible preferred stock, $0.0001 par value, 100.0 shares authorized, 14.1 shares issued and outstanding at September 30, 2023 and December 31, 2022 (liquidation preference of $126.5)	112	112
Stockholders’ equity:
Additional paid-in capital	1,874.9	1,850.7
Accumulated other comprehensive loss	(6.6)	(5.8)
Accumulated loss	(1,691.2)	(1,567.8)
Total stockholders’ equity	177.1	277.1
Total liabilities, redeemable convertible preferred stock and stockholders’ equity	1,240.2	1,312.9
Class A Shares
Stockholders’ equity:
Common stock, value	0	0
Class B Shares
Stockholders’ equity:
Common stock, value	$ 0	$ 0

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS - UNAUDITED (Parenthetical) - USD ($) shares in Millions, $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Amortized cost, fixed maturities	$ 171.1	$ 134.2
Amortized cost, short term investments	2.6	0.4
Allowance for premiums receivable	2.7	2.8
Allowance for credit loss	$ 2.9	$ 0.2
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	100	100
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	1,000
Common stock, shares issued (in shares)	9.5	9.2
Common stock, shares outstanding (in shares)	9.5	9.2
Class B Shares
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	269	269
Common stock, shares issued (in shares)	5	5
Common stock, shares outstanding (in shares)	5	5

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - UNAUDITED - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenues:
Net premiums earned	$ 100	$ 68.6	$ 223.9	$ 221.6
Net investment income	9	0.9	22.5	2.2
Net realized gains on investments	0	0	0	1.1
Fee income	6.2	3.8	13.2	13.1
Other income	0.1	0.4	0.6	1.5
Total revenues	115.3	73.7	260.2	239.5
Operating expenses:
Loss and loss adjustment expenses	85.8	80.9	208.6	273.3
Sales and marketing	13.1	8.1	22.8	44.8
Other insurance expense (benefit)	18.3	1.1	22.2	(5.7)
Technology and development	11.1	14.3	32.4	46.1
General and administrative	21	26.4	63.2	96.4
Total operating expenses	149.3	130.8	349.2	454.9
Operating loss	(34)	(57.1)	(89)	(215.4)
Interest expense	(11.8)	(9.3)	(34.4)	(24)
Loss before income tax expense	(45.8)	(66.4)	(123.4)	(239.4)
Income tax expense	0	0	0	0
Net loss	(45.8)	(66.4)	(123.4)	(239.4)
Other comprehensive loss:
Changes in net unrealized losses on investments	(0.7)	(2.3)	(0.8)	(7.3)
Comprehensive loss	$ (46.5)	$ (68.7)	$ (124.2)	$ (246.7)
Loss per common share: basic (both Class A and B) (in dollars per share)	$ (3.16)	$ (4.71)	$ (8.57)	$ (17.10)
Loss per common share: diluted (both Class A and B) (in dollars per share)	$ (3.16)	$ (4.71)	$ (8.57)	$ (17.10)
Weighted-average common shares outstanding: basic (both Class A and B) (in shares)	14.5	14.1	14.4	14
Weighted-average common shares outstanding: diluted (both Class A and B) (in shares)	14.5	14.1	14.4	14

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ EQUITY - UNAUDITED - USD ($) shares in Millions, $ in Millions	Total	Class A Shares	Class B Shares	Class A and Class B Common Stock	Class A and Class B Common Stock Class A Shares	Class A and Class B Common Stock Class B Shares	Additional Paid-in Capital	Accumulated Other Comprehensive (Loss) Income	Accumulated Loss
Beginning balance (in shares) at Dec. 31, 2021	14.1
Beginning balance at Dec. 31, 2021	$ 112
Ending balance (in shares) at Sep. 30, 2022	14.1
Ending balance at Sep. 30, 2022	$ 112
Beginning balance (in shares) at Dec. 31, 2021					7.9	6.1
Beginning balance at Dec. 31, 2021	536.4			$ 0			$ 1,806.1	$ 0.4	$ (1,270.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(239.4)								(239.4)
Other comprehensive loss	(7.3)							(7.3)
Conversion of Class B to Class A (in shares)					1.1	(1.1)
Common stock—option exercises and restricted stock units vesting, net of shares withheld for employee taxes (in shares)					0.1
Common stock—option exercises and restricted stock units vesting, net of shares withheld for employee taxes	0.4						0.4
Reclassification of early-exercised stock options from liabilities	0.1						0.1
Common stock—share-based compensation expense	21.8						21.8
Warrant compensation expense	10.3						10.3
Warrant issuance costs	(1.1)						(1.1)
Term Loan warrants issued	0.6						0.6
Ending balance (in shares) at Sep. 30, 2022					9.1	5
Ending balance at Sep. 30, 2022	$ 321.8			0			1,838.2	(6.9)	(1,509.5)
Beginning balance (in shares) at Jun. 30, 2022	14.1
Beginning balance at Jun. 30, 2022	$ 112
Ending balance (in shares) at Sep. 30, 2022	14.1
Ending balance at Sep. 30, 2022	$ 112
Beginning balance (in shares) at Jun. 30, 2022					8.9	5.2
Beginning balance at Jun. 30, 2022	381.3			0			1,829	(4.6)	(1,443.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(66.4)								(66.4)
Other comprehensive loss	(2.3)							(2.3)
Conversion of Class B to Class A (in shares)					0.2	(0.2)
Common stock—share-based compensation expense	7.8						7.8
Warrant compensation expense	1.5						1.5
Warrant issuance costs	(0.1)						(0.1)
Ending balance (in shares) at Sep. 30, 2022					9.1	5
Ending balance at Sep. 30, 2022	$ 321.8			0			1,838.2	(6.9)	(1,509.5)
Beginning balance (in shares) at Dec. 31, 2022	14.1
Beginning balance at Dec. 31, 2022	$ 112
Ending balance (in shares) at Sep. 30, 2023	14.1
Ending balance at Sep. 30, 2023	$ 112
Beginning balance (in shares) at Dec. 31, 2022		9.2	5		9.2	5
Beginning balance at Dec. 31, 2022	277.1			0			1,850.7	(5.8)	(1,567.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(123.4)								(123.4)
Other comprehensive loss	$ (0.8)							(0.8)
Common stock—option exercises and restricted stock units vesting, net of shares withheld for employee taxes (in shares)	0				0.3
Common stock—option exercises and restricted stock units vesting, net of shares withheld for employee taxes	$ 0
Common stock—share-based compensation expense	12.4						12.4
Warrant compensation expense	13.3						13.3
Warrant issuance costs	(1.5)						(1.5)
Ending balance (in shares) at Sep. 30, 2023		9.5	5		9.5	5
Ending balance at Sep. 30, 2023	$ 177.1			0			1,874.9	(6.6)	(1,691.2)
Beginning balance (in shares) at Jun. 30, 2023	14.1
Beginning balance at Jun. 30, 2023	$ 112
Ending balance (in shares) at Sep. 30, 2023	14.1
Ending balance at Sep. 30, 2023	$ 112
Beginning balance (in shares) at Jun. 30, 2023					9.4	5
Beginning balance at Jun. 30, 2023	214.4			0			1,865.7	(5.9)	(1,645.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(45.8)								(45.8)
Other comprehensive loss	(0.7)							(0.7)
Common stock—option exercises and restricted stock units vesting, net of shares withheld for employee taxes (in shares)					0.1
Common stock—option exercises and restricted stock units vesting, net of shares withheld for employee taxes	0
Common stock—share-based compensation expense	4.7						4.7
Warrant compensation expense	5						5
Warrant issuance costs	(0.5)						(0.5)
Ending balance (in shares) at Sep. 30, 2023		9.5	5		9.5	5
Ending balance at Sep. 30, 2023	$ 177.1			$ 0			$ 1,874.9	$ (6.6)	$ (1,691.2)

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - UNAUDITED - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash flows from operating activities:
Net loss	$ (123.4)	$ (239.4)
Adjustments to reconcile net loss to net cash used in operating activities:
Share-based compensation	12.4	21.8
Warrant compensation expense	13.3	10.3
Depreciation and amortization	8.2	9.5
Bad debt expense	10.6	13.7
Net realized gains on investments	0	(1.1)
Gain on lease modification	(0.3)	(0.2)
Changes in operating assets and liabilities:
Premiums receivable	(83.9)	4.5
Reinsurance recoverable and receivable	8.5	19
Prepaid reinsurance premiums	38.1	14.6
Other assets	10.6	(2)
Losses and loss adjustment expenses reserves	(30.9)	(26)
Unearned premiums	82.4	(22.8)
Reinsurance premiums payable	(48)	8.8
Accounts payable and accrued expenses	9.6	17.5
Other liabilities	13.1	7.9
Net cash used in operating activities	(79.7)	(163.9)
Cash flows from investing activities:
Purchases of investments	(61.7)	(30.8)
Proceeds from maturities, call and pay downs of investments	22.3	26.7
Sales of investments	0.5	7.1
Capitalization of internally developed software	(7.1)	(7.4)
Purchases of fixed assets	(0.2)	0
Purchases of indefinite-lived intangible assets and transaction costs	0	(1.3)
Net cash used in investing activities	(46.2)	(5.7)
Cash flows from financing activities:
Proceeds from exercise of stock options and restricted stock units, net of tax (withholding)/proceeds	(0.9)
Proceeds from exercise of stock options and restricted stock units, net of tax (withholding)/proceeds		0.3
Proceeds from issuance of debt and related warrants, net of issuance costs	0	286
Payment of preferred stock and related warrants issuance costs	0	(3)
Net cash (used in) provided by financing activities	(0.9)	283.3
Net (decrease) increase in cash, cash equivalents and restricted cash	(126.8)	113.7
Cash, cash equivalents and restricted cash at beginning of period	763.1	707
Cash, cash equivalents and restricted cash at end of period	$ 636.3	$ 820.7

NATURE OF BUSINESS

NATURE OF BUSINESS	9 Months Ended
	Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
NATURE OF BUSINESS	NATURE OF BUSINESSRoot, Inc. is a holding company which, directly or indirectly, maintains 100% ownership of each of its subsidiaries, including, among others, Root Insurance Company and Root Property & Casualty Insurance Company, both Ohio-domiciled insurance companies, and Root Reinsurance Company, Ltd., a Cayman Islands-domiciled reinsurance company, together with Root, Inc., “we,” “us” or “our.” We were formed in 2015 and began writing personal auto insurance in July 2016. We are a technology company operating primarily a direct-to-consumer model with the majority of our personal insurance customers acquired through mobile applications and our embedded platform. We offer auto and renters insurance products underwritten by Root Insurance Company and Root Property & Casualty Insurance Company.

BASIS OF PRESENTATION AND SUMMA

BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	9 Months Ended
	Sep. 30, 2023
Accounting Policies [Abstract]
BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation —In our opinion, all adjustments necessary for a fair presentation of the condensed consolidated financial statements have been included. All such adjustments are of a normal and recurring nature. These condensed consolidated financial statements are unaudited and, accordingly, should be read in conjunction with the consolidated financial statements and related notes included in the Annual Report on Form 10-K for the year ended December 31, 2022 filed with the Securities and Exchange Commission, or SEC, on February 22, 2023. Basis of Consolidation —The unaudited condensed consolidated financial statements include the accounts of Root, Inc. and its subsidiaries, all of which are wholly owned. These financial statements have been prepared in accordance with accounting principles generally accepted in the United States, or GAAP. All intercompany accounts and transactions have been eliminated. Use of Estimates —The preparation of the unaudited condensed consolidated financial statements requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the unaudited condensed consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from those estimates. Significant estimates reflected in our unaudited condensed consolidated financial statements include, but are not limited to, reserves for loss and loss adjustment expense, or LAE, valuation allowances for income taxes and allowance for expected credit losses on premium receivables and reinsurance recoverables. Revision of Previously Issued Financial Statements —During the fourth quarter of 2022, we identified errors in our first, second and third quarter financial statements for 2022 and revised the quarterly presentation of certain sales and marketing and general and administrative expenses on our condensed consolidated statements of operations and comprehensive loss related to the purported misappropriation of funds by a senior marketing employee. The errors did not impact periods prior to 2022. In accordance with SEC Staff Accounting Bulletin, or SAB, No. 99, Materiality, and SAB No. 108, Considering the Effects of Prior Year Misstatements when Quantifying Misstatements in Current Year Financial Statements , we assessed the materiality of these errors on our financial statements and concluded the errors were not material to the unaudited interim financial statements for the three and nine months ended September 30, 2022. The following tables present the effect of the revision on the condensed consolidated statements of operations and comprehensive loss for the three and nine months ended September 30, 2022, condensed consolidated statement of redeemable convertible preferred stock and stockholders’ equity and condensed consolidated statement of cash flows as of and for the nine months ended September 30, 2022. Three Months Ended September 30, 2022 (unaudited) Nine Months Ended September 30, 2022 (unaudited) As reported Adjustments As Corrected As reported Adjustments As Corrected (in millions, except per share amounts) Condensed consolidated statements of operations and comprehensive loss: Sales and marketing $ 5.7 $ 2.4 $ 8.1 $ 45.8 $ (1.0) $ 44.8 General and administrative 26.4 — 26.4 86.3 10.1 96.4 Total operating expenses 128.4 2.4 130.8 445.8 9.1 454.9 Operating loss (54.7) (2.4) (57.1) (206.3) (9.1) (215.4) Loss before income tax expense (64.0) (2.4) (66.4) (230.3) (9.1) (239.4) Net loss (64.0) (2.4) (66.4) (230.3) (9.1) (239.4) Comprehensive loss $ (66.3) $ (2.4) $ (68.7) $ (237.6) $ (9.1) $ (246.7) Weighted-average common shares outstanding: basic and diluted (both Class A and B) 14.1 14.1 14.0 14.0 Loss per common share: basic and diluted (both Class A and B) $ (4.54) $ (4.71) $ (16.45) $ (17.10) As of September 30, 2022 (unaudited) As reported Adjustments As Corrected (in millions) Condensed consolidated statement of redeemable convertible preferred stock and stockholders’ equity: Accumulated loss $ (1,500.4) $ (9.1) $ (1,509.5) Total stockholders’ equity $ 330.9 $ (9.1) $ 321.8 Nine Months Ended September 30, 2022 (unaudited) As reported Adjustments As Corrected (in millions) Condensed consolidated statement of cash flows: Net loss $ (230.3) $ (9.1) $ (239.4) Other assets (11.1) 9.1 (2.0) Net cash used in operating activities $ (163.9) $ — $ (163.9) Cash, Cash Equivalents and Restricted Cash —The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the condensed consolidated balance sheets that sum to the total of the same such amount in the condensed consolidated statements of cash flows: As of September 30, December 31, 2023 2022 (dollars in millions) Cash and cash equivalents $ 635.3 $ 762.1 Restricted cash 1.0 1.0 Total cash, cash equivalents and restricted cash shown in the condensed consolidated statements of cash flows $ 636.3 $ 763.1 Performance-Based Restricted Stock Units —During the third quarter of 2023, we granted 0.4 million performance-based restricted stock units, or PSUs, to certain key employees as part of our equity compensation plan. The PSUs are expected to vest over a derived service period of one Stock Compensation . The service condition with respect to the four tranches of PSUs will be met in installments on April 1, 2024, and each of the subsequent three anniversaries of that date, or Vesting Date Requirement, subject to the individual’s continued service through such dates. Stock price goals must be met on or after the respective tranche’s Vesting Date Requirement and are based on the average closing price per share of our Class A common stock over a consecutive 45 day trading period. Any tranche of PSUs with respect to which the stock price goal has not been met as of April 1, 2028 (the final day of the performance period) will be forfeited as of such date. The PSU compensation expense is recognized based on the grant date fair value of the award, which was determined by simulating Root’s stock prices using a Monte Carlo simulation in a risk-neutral framework, assuming a Geometric Brownian Motion. The simulation is repeated 100,000 times, and the average of the discounted values for each tranche is the grant date fair value for that tranche. The median time to vest is the derived service period. Employing a Monte Carlo simulation requires a range of inputs for each uncertain variable, and establishing linkage between the assumptions, if necessary. Inputs and assumptions used in our analysis included our stock price at grant date, exercise prices, the term of the PSUs, equity volatility, risk-free rate and dividend yield. Equity volatility was derived using a blended volatility assumption of 50% weight on Root’s historical volatility calculated from daily stock returns since IPO from the grant date and a 50% weight based on Root’s term matched simple average peer volatility as of the valuation date because our company-specific volatility is not sufficient by itself at the time of grant. The expense is recognized via a graded vesting method over the derived service period. In the event that both the service condition and market condition are met earlier, expense would be accelerated. If the service condition is not achieved, previously recognized compensation cost for the associated tranche is reversed. In the event that the market conditions are never achieved before the expiration date, but the service condition is met, the respective compensation costs remain recognized.

INVESTMENTS

INVESTMENTS	9 Months Ended
	Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract]
INVESTMENTS	INVESTMENTS The amortized cost and fair value of short-term investments and available-for-sale fixed maturity securities at September 30, 2023 and December 31, 2022 are as follows: September 30, 2023 Amortized Cost Allowance for Expected Credit Losses Gross Unrealized Gains Gross Unrealized Losses Fair Value (dollars in millions) Fixed maturities: U.S. Treasury securities and agencies $ 16.8 $ — $ — $ (0.4) $ 16.4 Municipal securities 25.6 — — (1.3) 24.3 Corporate debt securities 69.4 — — (2.9) 66.5 Residential mortgage-backed securities 12.3 — — (0.5) 11.8 Commercial mortgage-backed securities 31.0 — — (1.3) 29.7 Other debt obligations 16.0 — — (0.2) 15.8 Total fixed maturities 171.1 — — (6.6) 164.5 Short-term investments 2.6 — — — 2.6 Total $ 173.7 $ — $ — $ (6.6) $ 167.1 December 31, 2022 Amortized Cost Allowance for Expected Credit Losses Gross Unrealized Gains Gross Unrealized Losses Fair Value (dollars in millions) Fixed maturities: U.S. Treasury securities and agencies $ 11.3 $ — $ — $ (0.3) $ 11.0 Municipal securities 21.4 — — (1.2) 20.2 Corporate debt securities 60.5 — — (2.7) 57.8 Residential mortgage-backed securities 5.5 — — (0.3) 5.2 Commercial mortgage-backed securities 24.4 — — (1.2) 23.2 Other debt obligations 11.1 — 0.1 (0.2) 11.0 Total fixed maturities 134.2 — 0.1 (5.9) 128.4 Short-term investments 0.4 — — — 0.4 Total $ 134.6 $ — $ 0.1 $ (5.9) $ 128.8 Management reviewed the available-for-sale securities at each balance sheet date to consider whether it was necessary to recognize a credit loss as of September 30, 2023 and December 31, 2022. We do not intend to sell the investments and it is not more likely than not that we will be required to sell the security before recovery. Management concluded that the available-for-sale securities’ unrealized losses were due to non-credit related factors and, therefore, there was no allowance for credit loss as of September 30, 2023 and December 31, 2022. The following tables reflect the gross unrealized losses and fair value of short-term investments and available-for-sale fixed maturity securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at September 30, 2023 and December 31, 2022: September 30, 2023 Less than 12 Months 12 Months or More Total Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized (dollars in millions) Fixed maturities: U.S. Treasury securities and agencies $ 10.2 $ (0.2) $ 6.2 $ (0.2) $ 16.4 $ (0.4) Municipal securities 7.9 (0.2) 15.7 (1.1) 23.6 (1.3) Corporate debt securities 27.1 (0.8) 39.3 (2.1) 66.4 (2.9) Residential mortgage-backed securities 8.5 (0.2) 2.7 (0.3) 11.2 (0.5) Commercial mortgage-backed securities 13.5 (0.4) 15.8 (0.9) 29.3 (1.3) Other debt obligations 9.5 (0.1) 3.8 (0.1) 13.3 (0.2) Total fixed maturities 76.7 (1.9) 83.5 (4.7) 160.2 (6.6) Short-term investments 1.1 — — — 1.1 — Total $ 77.8 $ (1.9) $ 83.5 $ (4.7) $ 161.3 $ (6.6) December 31, 2022 Less than 12 Months 12 Months or More Total Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized (dollars in millions) Fixed maturities: U.S. Treasury securities and agencies $ 6.9 $ (0.1) $ 4.1 $ (0.2) $ 11.0 $ (0.3) Municipal securities 11.5 (0.5) 8.2 (0.7) 19.7 (1.2) Corporate debt securities 45.3 (1.6) 11.5 (1.1) 56.8 (2.7) Residential mortgage-backed securities 2.2 — 1.9 (0.3) 4.1 (0.3) Commercial mortgage-backed securities 18.3 (0.8) 4.6 (0.4) 22.9 (1.2) Other debt obligations 6.8 (0.2) — — 6.8 (0.2) Total fixed maturities 91.0 (3.2) 30.3 (2.7) 121.3 (5.9) Short-term investments 0.1 — — — 0.1 — Total $ 91.1 $ (3.2) $ 30.3 $ (2.7) $ 121.4 $ (5.9) Other Investments As of September 30, 2023 and December 31, 2022, other investments related to our private equity investments were $4.4 million. There were no realized gains or losses for the three and nine months ended September 30, 2023. We recognized zero and $1.2 million of realized gains for the three and nine months ended September 30, 2022, respectively. We recorded the gain on sale of our private equity investments within net realized gains on investments in our condensed consolidated statements of operations and comprehensive loss. There were no unrealized gains and losses or impairment losses recognized on private equity investments for the three and nine months ended September 30, 2023 and 2022. The following table reflects the gross and net realized gains and losses on short-term investments, available-for-sale fixed maturities and other investments that have been included in the condensed consolidated statements of operations and comprehensive loss for the three and nine months ended September 30, 2023 and 2022: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (dollars in millions) Realized gains on investments $ — $ — $ — $ 1.2 Realized losses on investments — — — (0.1) Net realized gains on investments $ — $ — $ — $ 1.1 The following table sets forth the amortized cost and fair value of short-term investments and available-for-sale fixed maturity securities by contractual maturity at September 30, 2023: September 30, 2023 Amortized Cost Fair Value (dollars in millions) Due in one year or less $ 33.3 $ 32.8 Due after one year through five years 102.3 98.1 Due five years through 10 years 21.4 20.4 Due after 10 years 16.7 15.8 Total $ 173.7 $ 167.1 The following table sets forth the components of net investment income for the three and nine months ended September 30, 2023 and 2022: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (dollars in millions) Interest on bonds $ 1.4 $ 0.6 $ 3.3 $ 1.7 Interest on deposits and cash equivalents 7.9 0.6 19.8 1.2 Total 9.3 1.2 23.1 2.9 Investment expense (0.3) (0.3) (0.6) (0.7) Net investment income $ 9.0 $ 0.9 $ 22.5 $ 2.2 The following tables summarize the credit ratings of short-term investments and available-for-sale fixed maturity securities at September 30, 2023 and December 31, 2022: September 30, 2023 Amortized Cost Fair Value % of Total (dollars in millions) S&P Global rating or equivalent AAA $ 51.2 $ 49.3 29.5 % AA+, AA, AA-, A-1 62.4 60.2 36.0 A+, A, A- 46.3 44.2 26.5 BBB+, BBB, BBB- 13.8 13.4 8.0 Total $ 173.7 $ 167.1 100.0 % December 31, 2022 Amortized Cost Fair Value % of Total (dollars in millions) S&P Global rating or equivalent AAA $ 62.5 $ 59.9 46.5 % AA+, AA, AA-, A-1 19.9 19.1 14.8 A+, A, A- 38.4 36.5 28.3 BBB+, BBB, BBB- 13.8 13.3 10.4 Total $ 134.6 $ 128.8 100.0 %

FAIR VALUE OF FINANCIAL INSTRUM

FAIR VALUE OF FINANCIAL INSTRUMENTS	9 Months Ended
	Sep. 30, 2023
Fair Value Disclosures [Abstract]
FAIR VALUE OF FINANCIAL INSTRUMENTS	FAIR VALUE OF FINANCIAL INSTRUMENTS The following tables provide information about our financial assets measured and reported at fair value as of September 30, 2023 and December 31, 2022: September 30, 2023 Level 1 Level 2 Level 3 Total (dollars in millions) Assets Fixed maturities: U.S. Treasury securities and agencies $ 15.4 $ 1.0 $ — $ 16.4 Municipal securities — 24.3 — 24.3 Corporate debt securities — 66.5 — 66.5 Residential mortgage-backed securities — 11.8 — 11.8 Commercial mortgage-backed securities — 29.7 — 29.7 Other debt obligations — 15.8 — 15.8 Total fixed maturities 15.4 149.1 — 164.5 Short-term investments 2.4 0.2 — 2.6 Cash equivalents 363.6 — — 363.6 Total assets at fair value $ 381.4 $ 149.3 $ — $ 530.7 December 31, 2022 Level 1 Level 2 Level 3 Total (dollars in millions) Assets Fixed maturities: U.S. Treasury securities and agencies $ 9.2 $ 1.8 $ — $ 11.0 Municipal securities — 20.2 — 20.2 Corporate debt securities — 57.8 — 57.8 Residential mortgage-backed securities — 5.2 — 5.2 Commercial mortgage-backed securities — 23.2 — 23.2 Other debt obligations — 11.0 — 11.0 Total fixed maturities 9.2 119.2 — 128.4 Short-term investments — 0.4 — 0.4 Cash equivalents 487.3 — — 487.3 Total assets at fair value $ 496.5 $ 119.6 $ — $ 616.1 We estimate the fair value of all our different classes of Level 2 fixed maturities and short-term investments by using quoted prices from a combination of an independent pricing vendor or broker/dealer, pricing models, quoted prices of securities with similar characteristics or discounted cash flows. All significant inputs were observable in the active markets. Private Equity Investments Measured at Fair Value on a Non-Recurring Basis Private equity investments that have been remeasured during the period due to an observable event or impairment are classified within Level 3 in the fair value hierarchy because we estimate the value based on valuation methods which may include a combination of the observable transaction price at the transaction date and other unobservable inputs including volatility, rights, and obligations of the investments we hold. See Note 3, “Investments,” for further information on our private equity investments. Fair Value of Long-Term Debt The carrying amount of long-term debt is recorded at the unpaid balance, net of discount and debt issuance costs. The fair value of outstanding long-term debt is classified within Level 2 of the fair value hierarchy. The fair value is based on a model referencing observable interest rates and spreads to project and discount cash flows to present value. As of September 30, 2023 and December 31, 2022, the carrying amounts and fair values of these financial instruments were as follows: Carrying Amount as of September 30, 2023 Estimated Fair Value as of September 30, 2023 Carrying Amount as of December 31, 2022 Estimated Fair Value as of December 31, 2022 (dollars in millions) Long-term debt $ 298.3 $ 304.8 $ 295.4 $ 309.7

LOSS AND LOSS ADJUSTMENT EXPENS

LOSS AND LOSS ADJUSTMENT EXPENSE RESERVES	9 Months Ended
	Sep. 30, 2023
Insurance [Abstract]
LOSS AND LOSS ADJUSTMENT EXPENSE RESERVES	LOSS AND LOSS ADJUSTMENT EXPENSE RESERVES The following provides a reconciliation of the beginning and ending reserve balances for loss and LAE, net of reinsurance: Nine Months Ended September 30, 2023 2022 (dollars in millions) Gross loss and LAE reserves, January 1 $ 287.4 $ 320.2 Reinsurance recoverable on unpaid losses (76.4) (79.5) Net loss and LAE reserves, January 1 211.0 240.7 Net incurred loss and LAE related to: Current year 209.2 273.5 Prior years (0.6) (0.2) Total incurred 208.6 273.3 Net paid loss and LAE related to: Current year 87.4 155.5 Prior years 117.3 135.6 Total paid 204.7 291.1 Net loss and LAE reserves, September 30 214.9 222.9 Plus reinsurance recoverable on unpaid losses 41.6 71.3 Gross loss and LAE reserves, September 30 $ 256.5 $ 294.2 Incurred losses and LAE attributable to prior accident years was a decrease of $0.6 million and $0.2 million for the nine months ended September 30, 2023 and 2022, respectively. For the nine months ended September 30, 2023, the development of incurred losses and LAE related to prior periods was a result of lower-than-expected reported losses on injury coverages, partially offset by losses on commutations of certain reinsurance agreements and higher-than-expected LAE on prior accident periods. For the nine months ended September 30, 2022, the development of incurred losses and LAE related to prior periods was a result of lower-than-expected LAE on prior accident period claims, partially offset by higher-than-expected reported losses on property damage and collision claims due to inflation.

REINSURANCE

REINSURANCE	9 Months Ended
	Sep. 30, 2023
Insurance [Abstract]
REINSURANCE	REINSURANCE The following table reflects amounts affecting the condensed consolidated statements of operations and comprehensive loss for reinsurance for the three and nine months ended September 30, 2023 and 2022: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (dollars in millions) Premiums written: Direct $ 192.7 $ 139.6 $ 444.6 $ 443.9 Assumed 31.5 11.1 59.3 34.1 Ceded (22.3) (81.0) (159.4) (264.5) Net premiums written $ 201.9 $ 69.7 $ 344.5 $ 213.5 Premiums earned: Direct $ 141.6 $ 144.5 $ 381.9 $ 469.3 Assumed 18.2 10.8 39.5 31.5 Ceded (59.8) (86.7) (197.5) (279.2) Net premiums earned $ 100.0 $ 68.6 $ 223.9 $ 221.6 Losses and LAE incurred: Direct $ 106.8 $ 126.1 $ 297.1 $ 430.0 Assumed 13.4 11.3 29.8 35.7 Ceded (34.4) (56.5) (118.3) (192.4) Net losses and LAE incurred $ 85.8 $ 80.9 $ 208.6 $ 273.3 During the third quarter of 2023, we commuted certain agreements with our reinsurers which resulted in $4.4 million of net premiums earned, $4.2 million of loss and loss adjustment expenses and $5.8 million of other insurance expense (benefit), respectively, on the condensed consolidated statements of operations and comprehensive loss. A portion of the loss and loss adjustment expenses is related to an allowance for credit losses of $2.8 million, that was established due to a commutation with one of our reinsurers as of September 30, 2023. Additionally, in connection with the commutation of certain agreements with reinsurers during the third quarter of 2023, we received cash and cash equivalents of $3.9 million, reinsurance recoverable and receivable decreased by $6.1 million, prepaid reinsurance premiums was reduced by $33.5 million and reinsurance premiums payable decreased by $30.2 million all of which are reported within the condensed consolidated balance sheets. In the event that all or any of the reinsuring companies might be unable to meet their obligations under existing reinsurance agreements, we would be liable to the policyholder for such defaulted amounts. Gross premiums written by state is as follows for the three and nine months ended September 30, 2023 and 2022: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Amount % of Total Amount % of Total Amount % of Total Amount % of Total (dollars in millions) State: Texas $ 36.8 16.4 % $ 26.2 17.4 % $ 80.1 15.9 % $ 89.5 18.7 % Georgia 26.3 11.7 15.0 10.0 56.0 11.1 48.8 10.2 Colorado 15.3 6.8 10.3 6.8 37.8 7.5 30.8 6.4 Pennsylvania 12.1 5.4 9.1 6.0 29.0 5.8 26.8 5.6 South Carolina 11.8 5.3 4.5 3.0 28.6 5.7 16.4 3.4 Utah 8.3 3.7 8.0 5.3 22.9 4.5 24.1 5.0 Arizona 11.0 4.9 4.3 2.9 21.7 4.3 13.3 2.8 Ohio 8.4 3.7 3.9 2.6 16.9 3.4 11.8 2.5 Oklahoma 7.2 3.2 5.2 3.5 16.7 3.3 16.1 3.4 Missouri 8.7 3.9 4.3 2.9 16.1 3.2 14.2 3.0 All others states 78.3 35.0 59.9 39.6 178.1 35.3 186.2 39.0 Total $ 224.2 100.0 % $ 150.7 100.0 % $ 503.9 100.0 % $ 478.0 100.0 %

LONG-TERM DEBT

LONG-TERM DEBT	9 Months Ended
	Sep. 30, 2023
Debt Disclosure [Abstract]
LONG-TERM DEBT	LONG-TERM DEBTIn January 2022, we entered into a $300.0 million five-year term loan, or Term Loan, with the principal amount due and payable upon maturity on January 27, 2027. Interest is payable quarterly and is determined on a floating interest rate currently calculated on the Secured Overnight Financing Rate, or SOFR, with a 1.0% floor, plus 9.0%. The following summarizes the carrying value of long-term debt as of September 30, 2023 and December 31, 2022: September 30, 2023 December 31, 2022 (dollars in millions) Term Loan $ 300.0 $ 300.0 Accrued interest payable 7.9 7.3 Unamortized discount, debt issuance costs and warrants (9.6) (11.9) Total $ 298.3 $ 295.4

INCOME TAXES

INCOME TAXES	9 Months Ended
	Sep. 30, 2023
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES The consolidated effective tax rate was zero for the three and nine months ended September 30, 2023 and 2022. The difference between these rates and the U.S. federal income tax rate of 21% was primarily due to a full valuation allowance on our U.S. deferred tax assets. As of September 30, 2023 and December 31, 2022, we did not have any unrecognized tax benefits for uncertain tax positions and had no interest or penalties related to uncertain tax positions.

RESTRUCTURING COSTS

RESTRUCTURING COSTS	9 Months Ended
	Sep. 30, 2023
Restructuring and Related Activities [Abstract]
RESTRUCTURING COSTS	RESTRUCTURING COSTS In 2022, we conducted strategic initiatives to reduce operating costs, improve efficiency, and increase focus on our strategic priorities. These initiatives resulted in restructuring actions that included a reduction in workforce levels, contract terminations, and in certain instances, a reduction in office space. These restructuring actions include the following costs: Employee costs —consist of severance, benefits, share-based compensation, and employee compensation expense dependent upon continuous employment for certain employees and related employee costs. Real estate exit costs —consist of real estate exit costs primarily related to accelerated amortization of right-of-use assets, leasehold improvements and furniture and fixtures. Other costs —primarily consist of contract termination costs incurred as part of our efforts to improve efficiency and reduce operating costs and accelerated expense for software that no longer has economic benefit. As of September 30, 2023, we expect to incur approximately $1.7 million of employee compensation expense, dependent upon continuous employment for certain employees, to be recognized ratably through the fourth quarter of 2023. We expect a cash expenditure related to these employee compensation costs in January 2024. As of September 30, 2023, except as discussed above, we do not expect to incur any additional material expenditures in future periods related to restructuring actions that have occurred. The following table displays restructuring costs recorded in general and administrative expenses on the condensed consolidated statements of operations and comprehensive loss: Three Months Ended September 30, Nine Months Ended September 30, Cumulative Incurred Through September 30, 2023 2023 2022 2023 2022 (dollars in millions) Restructuring costs: Employee costs $ 1.8 $ — $ 5.9 $ 5.6 $ 21.4 Real estate exit costs — — — 2.1 2.1 Other costs 0.1 — 3.5 0.7 4.5 Total restructuring costs $ 1.9 $ — $ 9.4 $ 8.4 $ 28.0 Employee costs Other costs Total liability (dollars in millions) Restructuring activity: Restructuring liability as of January 1, 2023 $ 3.1 $ 0.1 $ 3.2 Expense incurred 5.5 3.4 8.9 Payments (2.0) (3.5) (5.5) Restructuring liability as of September 30, 2023 $ 6.6 $ — $ 6.6

SHARE-BASED COMPENSATION

SHARE-BASED COMPENSATION	9 Months Ended
	Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]
SHARE-BASED COMPENSATION	SHARE-BASED COMPENSATION Warrants In October 2021, we issued Carvana eight tranches of warrants, comprised of three tranches of “short-term warrants” and five tranches of “long-term warrants,” with the opportunity to purchase a maximum of 7.2 million shares of Class A common stock. As of September 30, 2023, we determined the remaining unvested short-term warrants were probable of vesting. Under that scenario, it is not a possible outcome for the long-term warrants to also vest, so they are considered not probable of vesting. We recognized warrant compensation expense related to these equity-classified warrants based on progress toward completing the integrated automobile insurance solution for Carvana’s online buying platform, or the Integrated Platform, and policies originating through the Integrated Platform. All of these warrants are out-of-the-money and therefore have no intrinsic value as of September 30, 2023. The following table displays warrant compensation expense recorded in the condensed consolidated statements of operations and comprehensive loss: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (dollars in millions) Warrant compensation expense: Sales and marketing $ — $ — $ — $ 8.8 Other insurance expense (benefit) 5.0 1.5 13.3 1.5 Total warrant compensation expense $ 5.0 $ 1.5 $ 13.3 $ 10.3 As of September 30, 2023, there was $7.8 million of unrecognized compensation cost related to warrants. The remaining costs are expected to be recognized over a period of approximately one year. Employee Share-Based Compensation We maintain an equity incentive plan, or the Plan, for the issuance and grant of equity awards (restricted stock, restricted stock units, or RSUs, PSUs, and incentive and nonqualified stock options) to our officers, directors, employees and certain advisors. As of September 30, 2023, we had 1.2 million common shares available for issuance under the Plan. The following table displays share-based compensation expense recorded in the condensed consolidated statements of operations and comprehensive loss: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (dollars in millions) Share-based compensation expense: Loss and loss adjustment expenses $ 0.2 $ 0.2 $ 0.5 $ 0.6 Sales and marketing 0.1 0.3 0.3 0.7 Other insurance expense (benefit) 0.1 0.3 0.4 0.8 Technology and development 0.9 1.1 2.4 3.1 General and administrative 3.4 5.9 8.8 16.6 Total share-based compensation expense $ 4.7 $ 7.8 $ 12.4 $ 21.8 The following table provides total share-based compensation expense by type of award: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (dollars in millions) Share-based compensation expense: Restricted stock unit expense $ 4.4 $ 7.4 $ 11.4 $ 20.5 Performance-based restricted stock unit expense 0.1 — 0.1 — Stock option expense 0.2 0.4 0.9 1.3 Total share-based compensation expense $ 4.7 $ 7.8 $ 12.4 $ 21.8 As of September 30, 2023, there was $1.2 million, $25.3 million, and $2.2 million of unrecognized compensation cost related to unvested stock options, RSUs, and PSUs, respectively. The remaining costs are expected to be recognized over a period of approximately three years for unvested stock options and four years for RSUs and PSUs. Performance-Based Restricted Stock Units The fair value of the PSUs is estimated on the date of grant using a Monte Carlo simulation with Geometric Brownian Motion that uses certain inputs, assumptions and estimates, as follows: expected term of approximately five years, based on the contractual term of the PSUs; risk-free interest rate of 4.06%, based on U.S. Constant Maturity Yield Curve over a similar term; dividend rate of 0.0%, based on our historical and expected future dividend payouts; and volatility of 76%, and other factors. The following table provides other key terms of the PSUs: Performance-Based Restricted Stock Units Stock Price Goals Shares Issued Grant Date Fair Value per Share (in millions, except per share amounts) Tranches: Tranche 1 $ 16.76 — $ 7.69 Tranche 2 25.14 0.1 6.70 Tranche 3 33.52 0.1 5.87 Tranche 4 $ 41.90 0.2 $ 5.10 0.4 Restricted Stock Units and Performance-Based Restricted Stock Units A summary of RSU and PSU activity for the nine months ended September 30, 2023 is as follows: Nine Months Ended September 30, 2023 Restricted Stock Units and Performance-Based Restricted Stock Units Number of Shares Weighted-Average Aggregate Intrinsic Value (in millions, except per share amounts) Nonvested at January 1, 2023 1.1 $ 51.81 $ 5.0 Granted 1.6 6.62 Vested (0.5) 50.44 2.8 Forfeited, expired or canceled (0.2) 53.75 Nonvested at September 30, 2023 2.0 $ 15.79 $ 18.9 Stock Options A summary of option activity for the nine months ended September 30, 2023 is as follows: Nine Months Ended September 30, 2023 Options Number of Shares Weighted-Average Exercise Price Weighted-Average Remaining Contractual Term (in Years) Aggregate Intrinsic Value (in millions, except exercise price and term amounts) Outstanding and exercisable at January 1, 2023 0.2 $ 38.15 5.63 $ 0.2 Granted — 8.94 Exercised — — — Forfeited, expired or canceled (0.1) 44.86 Outstanding and exercisable at September 30, 2023 0.1 $ 33.74 4.53 $ 0.5

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	9 Months Ended
	Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES From time to time, we are party to litigation and legal proceedings relating to our business operations. Except as disclosed below, we do not believe that we are party to any current or pending legal action that could reasonably be expected to have a material adverse effect on our financial condition or results of operations and cash flow. On December 19, 2022, a purported class action complaint was filed against the Company’s subsidiary, Root Insurance Company, in the U.S. District Court for the Western District of Texas (Case No. 1:22-cv-01328-LY) by an individual on her behalf and further claiming to represent a putative class of insureds. The complaint alleges that Root Insurance Company breached its insurance contract and violated specific provisions of the Texas Prompt Payment of Claims Act for an alleged failure to include sales tax in total loss vehicle settlements. The complaint seeks damages to include payment of alleged benefits owed under the policy, in addition to pre- and post-judgment interest and attorneys fees on behalf of the named plaintiff and the putative class members. Root Insurance Company’s motion to dismiss the claims set forth in the complaint was granted and the lawsuit was dismissed with prejudice on August 22, 2023, which dismissal has been appealed. The Company believes that the claims in this lawsuit are without merit and intends to defend against them vigorously. The lawsuit is in its early stages. Therefore, at this time, we cannot predict the outcome or estimate the likelihood or magnitude of our possible or potential loss contingency. On June 27, 2022, a verified shareholder derivative complaint was filed against certain of the Company’s current and former officers and directors in the U.S. District Court for the District of Delaware (Case No. 1:22- cv-00865). The Company was named as a nominal defendant. The complaint alleges that defendants made false or misleading statements and omissions of purportedly material fact, in violation of Section 10(b) of the Securities Exchange Act of 1934, or the Exchange Act, and Rule 10b-5 thereunder, breached their fiduciary duties and/or aided and abetted the breach of fiduciary duties, were unjustly enriched, wasted corporate assets, and are liable under Section 11(f) of the Securities Act of 1933, or the Securities Act, in connection with and following the Company’s initial public offering. The complaint seeks unspecified damages. The Company believes that the claims in this lawsuit are without merit and intends to defend against them vigorously. The lawsuit is currently stayed pending final resolution of the below matter and, at this time, we cannot predict the outcome or estimate the likelihood or magnitude of our possible or potential loss contingency. On March 19, 2021, a purported class action complaint was filed against the Company and certain of its current and former officers and directors in the U.S. District Court for the Southern District of Ohio (Case No. 2:21-cv-01197) on behalf of certain Root shareholders. The complaint alleges that defendants made false or misleading statements and omissions of purportedly material fact, in violation of Sections 10(b) and 20(a) of the Exchange Act and Rule 10b-5 thereunder, and of Sections 11 and 15 of the Securities Act in connection with and following the Company’s initial public offering. The complaint seeks unspecified damages. The defendants’ motion to dismiss the claims set forth in the complaint was granted and the lawsuit was dismissed with prejudice on March 31, 2023, which dismissal has been appealed. The Company believes that the claims in this lawsuit are without merit and intends to defend against them vigorously. The lawsuit is in the early stages and, at this time, we cannot predict the outcome or estimate the likelihood or magnitude of our possible or potential loss contingency. We are contingently liable for possible future assessments under regulatory requirements for insolvencies and impairments of unaffiliated insurance companies.

OTHER COMPREHENSIVE LOSS AND AC

OTHER COMPREHENSIVE LOSS AND ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME	9 Months Ended
	Sep. 30, 2023
Equity [Abstract]
OTHER COMPREHENSIVE LOSS AND ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME	OTHER COMPREHENSIVE LOSS AND ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME The following table presents the changes in our accumulated other comprehensive (loss) income, or AOCI, for the three and nine months ended September 30, 2023 and 2022: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (dollars in millions) Beginning balance $ (5.9) $ (4.6) $ (5.8) $ 0.4 Other comprehensive loss before reclassifications (0.7) (2.3) (0.8) (7.4) Net realized losses on investments reclassified from AOCI to net loss — — — 0.1 Other comprehensive loss (0.7) (2.3) (0.8) (7.3) Ending balance $ (6.6) $ (6.9) $ (6.6) $ (6.9)

LOSS PER SHARE

LOSS PER SHARE	9 Months Ended
	Sep. 30, 2023
Earnings Per Share [Abstract]
LOSS PER SHARE	LOSS PER SHARE The following table displays the computation of basic and diluted loss per share for both Class A and Class B common stock for the three and nine months ended September 30, 2023 and 2022: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (in millions, except per share amounts) Net loss $ (45.8) $ (66.4) $ (123.4) $ (239.4) Weighted-average common shares outstanding: basic and diluted (both Class A and B) 14.5 14.1 14.4 14.0 Loss per common share: basic and diluted (both Class A and B) $ (3.16) $ (4.71) $ (8.57) $ (17.10) We excluded the following potentially dilutive common stock equivalents, presented based on amounts outstanding at each period end, from the computation of diluted loss per share attributable to common shareholders for the periods indicated because including them would have had an anti-dilutive effect: As of September 30, 2023 2022 (in millions) Options to purchase common stock 0.1 0.2 Nonvested shares subject to repurchase 0.1 0.1 Restricted stock units and performance-based restricted stock units 2.0 1.3 Redeemable convertible preferred stock (as converted to common stock) 0.8 0.8 Warrants to purchase common stock 7.7 7.7 Total 10.7 10.1

GEOGRAPHICAL BREAKDOWN OF GROSS

GEOGRAPHICAL BREAKDOWN OF GROSS PREMIUMS WRITTEN	9 Months Ended
	Sep. 30, 2023
Insurance [Abstract]
GEOGRAPHICAL BREAKDOWN OF GROSS PREMIUMS WRITTEN	REINSURANCE The following table reflects amounts affecting the condensed consolidated statements of operations and comprehensive loss for reinsurance for the three and nine months ended September 30, 2023 and 2022: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (dollars in millions) Premiums written: Direct $ 192.7 $ 139.6 $ 444.6 $ 443.9 Assumed 31.5 11.1 59.3 34.1 Ceded (22.3) (81.0) (159.4) (264.5) Net premiums written $ 201.9 $ 69.7 $ 344.5 $ 213.5 Premiums earned: Direct $ 141.6 $ 144.5 $ 381.9 $ 469.3 Assumed 18.2 10.8 39.5 31.5 Ceded (59.8) (86.7) (197.5) (279.2) Net premiums earned $ 100.0 $ 68.6 $ 223.9 $ 221.6 Losses and LAE incurred: Direct $ 106.8 $ 126.1 $ 297.1 $ 430.0 Assumed 13.4 11.3 29.8 35.7 Ceded (34.4) (56.5) (118.3) (192.4) Net losses and LAE incurred $ 85.8 $ 80.9 $ 208.6 $ 273.3 During the third quarter of 2023, we commuted certain agreements with our reinsurers which resulted in $4.4 million of net premiums earned, $4.2 million of loss and loss adjustment expenses and $5.8 million of other insurance expense (benefit), respectively, on the condensed consolidated statements of operations and comprehensive loss. A portion of the loss and loss adjustment expenses is related to an allowance for credit losses of $2.8 million, that was established due to a commutation with one of our reinsurers as of September 30, 2023. Additionally, in connection with the commutation of certain agreements with reinsurers during the third quarter of 2023, we received cash and cash equivalents of $3.9 million, reinsurance recoverable and receivable decreased by $6.1 million, prepaid reinsurance premiums was reduced by $33.5 million and reinsurance premiums payable decreased by $30.2 million all of which are reported within the condensed consolidated balance sheets. In the event that all or any of the reinsuring companies might be unable to meet their obligations under existing reinsurance agreements, we would be liable to the policyholder for such defaulted amounts. Gross premiums written by state is as follows for the three and nine months ended September 30, 2023 and 2022: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Amount % of Total Amount % of Total Amount % of Total Amount % of Total (dollars in millions) State: Texas $ 36.8 16.4 % $ 26.2 17.4 % $ 80.1 15.9 % $ 89.5 18.7 % Georgia 26.3 11.7 15.0 10.0 56.0 11.1 48.8 10.2 Colorado 15.3 6.8 10.3 6.8 37.8 7.5 30.8 6.4 Pennsylvania 12.1 5.4 9.1 6.0 29.0 5.8 26.8 5.6 South Carolina 11.8 5.3 4.5 3.0 28.6 5.7 16.4 3.4 Utah 8.3 3.7 8.0 5.3 22.9 4.5 24.1 5.0 Arizona 11.0 4.9 4.3 2.9 21.7 4.3 13.3 2.8 Ohio 8.4 3.7 3.9 2.6 16.9 3.4 11.8 2.5 Oklahoma 7.2 3.2 5.2 3.5 16.7 3.3 16.1 3.4 Missouri 8.7 3.9 4.3 2.9 16.1 3.2 14.2 3.0 All others states 78.3 35.0 59.9 39.6 178.1 35.3 186.2 39.0 Total $ 224.2 100.0 % $ 150.7 100.0 % $ 503.9 100.0 % $ 478.0 100.0 %

BASIS OF PRESENTATION AND SUM_2

BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	9 Months Ended
	Sep. 30, 2023
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation —In our opinion, all adjustments necessary for a fair presentation of the condensed consolidated financial statements have been included. All such adjustments are of a normal and recurring nature. These condensed consolidated financial statements are unaudited and, accordingly, should be read in conjunction with the consolidated financial statements and related notes included in the Annual Report on Form 10-K for the year ended December 31, 2022 filed with the Securities and Exchange Commission, or SEC, on February 22, 2023.
Basis of Consolidation	Basis of Consolidation —The unaudited condensed consolidated financial statements include the accounts of Root, Inc. and its subsidiaries, all of which are wholly owned. These financial statements have been prepared in accordance with accounting principles generally accepted in the United States, or GAAP. All intercompany accounts and transactions have been eliminated.
Use of Estimates	Use of Estimates —The preparation of the unaudited condensed consolidated financial statements requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the unaudited condensed consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from those estimates. Significant estimates reflected in our unaudited condensed consolidated financial statements include, but are not limited to, reserves for loss and loss adjustment expense, or LAE, valuation allowances for income taxes and allowance for expected credit losses on premium receivables and reinsurance recoverables.

BASIS OF PRESENTATION AND SUM_3

BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)	9 Months Ended
	Sep. 30, 2023
Accounting Policies [Abstract]
Schedule of Error Corrections and Prior Period Adjustments	The following tables present the effect of the revision on the condensed consolidated statements of operations and comprehensive loss for the three and nine months ended September 30, 2022, condensed consolidated statement of redeemable convertible preferred stock and stockholders’ equity and condensed consolidated statement of cash flows as of and for the nine months ended September 30, 2022. Three Months Ended September 30, 2022 (unaudited) Nine Months Ended September 30, 2022 (unaudited) As reported Adjustments As Corrected As reported Adjustments As Corrected (in millions, except per share amounts) Condensed consolidated statements of operations and comprehensive loss: Sales and marketing $ 5.7 $ 2.4 $ 8.1 $ 45.8 $ (1.0) $ 44.8 General and administrative 26.4 — 26.4 86.3 10.1 96.4 Total operating expenses 128.4 2.4 130.8 445.8 9.1 454.9 Operating loss (54.7) (2.4) (57.1) (206.3) (9.1) (215.4) Loss before income tax expense (64.0) (2.4) (66.4) (230.3) (9.1) (239.4) Net loss (64.0) (2.4) (66.4) (230.3) (9.1) (239.4) Comprehensive loss $ (66.3) $ (2.4) $ (68.7) $ (237.6) $ (9.1) $ (246.7) Weighted-average common shares outstanding: basic and diluted (both Class A and B) 14.1 14.1 14.0 14.0 Loss per common share: basic and diluted (both Class A and B) $ (4.54) $ (4.71) $ (16.45) $ (17.10) As of September 30, 2022 (unaudited) As reported Adjustments As Corrected (in millions) Condensed consolidated statement of redeemable convertible preferred stock and stockholders’ equity: Accumulated loss $ (1,500.4) $ (9.1) $ (1,509.5) Total stockholders’ equity $ 330.9 $ (9.1) $ 321.8 Nine Months Ended September 30, 2022 (unaudited) As reported Adjustments As Corrected (in millions) Condensed consolidated statement of cash flows: Net loss $ (230.3) $ (9.1) $ (239.4) Other assets (11.1) 9.1 (2.0) Net cash used in operating activities $ (163.9) $ — $ (163.9)
Schedule of Cash and Cash Equivalents	The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the condensed consolidated balance sheets that sum to the total of the same such amount in the condensed consolidated statements of cash flows: As of September 30, December 31, 2023 2022 (dollars in millions) Cash and cash equivalents $ 635.3 $ 762.1 Restricted cash 1.0 1.0 Total cash, cash equivalents and restricted cash shown in the condensed consolidated statements of cash flows $ 636.3 $ 763.1

INVESTMENTS (Tables)

INVESTMENTS (Tables)	9 Months Ended
	Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract]
Schedule of AFS Debt Securities	The amortized cost and fair value of short-term investments and available-for-sale fixed maturity securities at September 30, 2023 and December 31, 2022 are as follows: September 30, 2023 Amortized Cost Allowance for Expected Credit Losses Gross Unrealized Gains Gross Unrealized Losses Fair Value (dollars in millions) Fixed maturities: U.S. Treasury securities and agencies $ 16.8 $ — $ — $ (0.4) $ 16.4 Municipal securities 25.6 — — (1.3) 24.3 Corporate debt securities 69.4 — — (2.9) 66.5 Residential mortgage-backed securities 12.3 — — (0.5) 11.8 Commercial mortgage-backed securities 31.0 — — (1.3) 29.7 Other debt obligations 16.0 — — (0.2) 15.8 Total fixed maturities 171.1 — — (6.6) 164.5 Short-term investments 2.6 — — — 2.6 Total $ 173.7 $ — $ — $ (6.6) $ 167.1 December 31, 2022 Amortized Cost Allowance for Expected Credit Losses Gross Unrealized Gains Gross Unrealized Losses Fair Value (dollars in millions) Fixed maturities: U.S. Treasury securities and agencies $ 11.3 $ — $ — $ (0.3) $ 11.0 Municipal securities 21.4 — — (1.2) 20.2 Corporate debt securities 60.5 — — (2.7) 57.8 Residential mortgage-backed securities 5.5 — — (0.3) 5.2 Commercial mortgage-backed securities 24.4 — — (1.2) 23.2 Other debt obligations 11.1 — 0.1 (0.2) 11.0 Total fixed maturities 134.2 — 0.1 (5.9) 128.4 Short-term investments 0.4 — — — 0.4 Total $ 134.6 $ — $ 0.1 $ (5.9) $ 128.8 The following table reflects the gross and net realized gains and losses on short-term investments, available-for-sale fixed maturities and other investments that have been included in the condensed consolidated statements of operations and comprehensive loss for the three and nine months ended September 30, 2023 and 2022: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (dollars in millions) Realized gains on investments $ — $ — $ — $ 1.2 Realized losses on investments — — — (0.1) Net realized gains on investments $ — $ — $ — $ 1.1 The following table sets forth the amortized cost and fair value of short-term investments and available-for-sale fixed maturity securities by contractual maturity at September 30, 2023: September 30, 2023 Amortized Cost Fair Value (dollars in millions) Due in one year or less $ 33.3 $ 32.8 Due after one year through five years 102.3 98.1 Due five years through 10 years 21.4 20.4 Due after 10 years 16.7 15.8 Total $ 173.7 $ 167.1
Schedule of Unrealized Losses	The following tables reflect the gross unrealized losses and fair value of short-term investments and available-for-sale fixed maturity securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at September 30, 2023 and December 31, 2022: September 30, 2023 Less than 12 Months 12 Months or More Total Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized (dollars in millions) Fixed maturities: U.S. Treasury securities and agencies $ 10.2 $ (0.2) $ 6.2 $ (0.2) $ 16.4 $ (0.4) Municipal securities 7.9 (0.2) 15.7 (1.1) 23.6 (1.3) Corporate debt securities 27.1 (0.8) 39.3 (2.1) 66.4 (2.9) Residential mortgage-backed securities 8.5 (0.2) 2.7 (0.3) 11.2 (0.5) Commercial mortgage-backed securities 13.5 (0.4) 15.8 (0.9) 29.3 (1.3) Other debt obligations 9.5 (0.1) 3.8 (0.1) 13.3 (0.2) Total fixed maturities 76.7 (1.9) 83.5 (4.7) 160.2 (6.6) Short-term investments 1.1 — — — 1.1 — Total $ 77.8 $ (1.9) $ 83.5 $ (4.7) $ 161.3 $ (6.6) December 31, 2022 Less than 12 Months 12 Months or More Total Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized (dollars in millions) Fixed maturities: U.S. Treasury securities and agencies $ 6.9 $ (0.1) $ 4.1 $ (0.2) $ 11.0 $ (0.3) Municipal securities 11.5 (0.5) 8.2 (0.7) 19.7 (1.2) Corporate debt securities 45.3 (1.6) 11.5 (1.1) 56.8 (2.7) Residential mortgage-backed securities 2.2 — 1.9 (0.3) 4.1 (0.3) Commercial mortgage-backed securities 18.3 (0.8) 4.6 (0.4) 22.9 (1.2) Other debt obligations 6.8 (0.2) — — 6.8 (0.2) Total fixed maturities 91.0 (3.2) 30.3 (2.7) 121.3 (5.9) Short-term investments 0.1 — — — 0.1 — Total $ 91.1 $ (3.2) $ 30.3 $ (2.7) $ 121.4 $ (5.9)
Schedule of Net Investment Income	The following table sets forth the components of net investment income for the three and nine months ended September 30, 2023 and 2022: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (dollars in millions) Interest on bonds $ 1.4 $ 0.6 $ 3.3 $ 1.7 Interest on deposits and cash equivalents 7.9 0.6 19.8 1.2 Total 9.3 1.2 23.1 2.9 Investment expense (0.3) (0.3) (0.6) (0.7) Net investment income $ 9.0 $ 0.9 $ 22.5 $ 2.2
Schedule of Credit Ratings	The following tables summarize the credit ratings of short-term investments and available-for-sale fixed maturity securities at September 30, 2023 and December 31, 2022: September 30, 2023 Amortized Cost Fair Value % of Total (dollars in millions) S&P Global rating or equivalent AAA $ 51.2 $ 49.3 29.5 % AA+, AA, AA-, A-1 62.4 60.2 36.0 A+, A, A- 46.3 44.2 26.5 BBB+, BBB, BBB- 13.8 13.4 8.0 Total $ 173.7 $ 167.1 100.0 % December 31, 2022 Amortized Cost Fair Value % of Total (dollars in millions) S&P Global rating or equivalent AAA $ 62.5 $ 59.9 46.5 % AA+, AA, AA-, A-1 19.9 19.1 14.8 A+, A, A- 38.4 36.5 28.3 BBB+, BBB, BBB- 13.8 13.3 10.4 Total $ 134.6 $ 128.8 100.0 %

FAIR VALUE OF FINANCIAL INSTR_2

FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)	9 Months Ended
	Sep. 30, 2023
Fair Value Disclosures [Abstract]
Schedule of Fair Value	The following tables provide information about our financial assets measured and reported at fair value as of September 30, 2023 and December 31, 2022: September 30, 2023 Level 1 Level 2 Level 3 Total (dollars in millions) Assets Fixed maturities: U.S. Treasury securities and agencies $ 15.4 $ 1.0 $ — $ 16.4 Municipal securities — 24.3 — 24.3 Corporate debt securities — 66.5 — 66.5 Residential mortgage-backed securities — 11.8 — 11.8 Commercial mortgage-backed securities — 29.7 — 29.7 Other debt obligations — 15.8 — 15.8 Total fixed maturities 15.4 149.1 — 164.5 Short-term investments 2.4 0.2 — 2.6 Cash equivalents 363.6 — — 363.6 Total assets at fair value $ 381.4 $ 149.3 $ — $ 530.7 December 31, 2022 Level 1 Level 2 Level 3 Total (dollars in millions) Assets Fixed maturities: U.S. Treasury securities and agencies $ 9.2 $ 1.8 $ — $ 11.0 Municipal securities — 20.2 — 20.2 Corporate debt securities — 57.8 — 57.8 Residential mortgage-backed securities — 5.2 — 5.2 Commercial mortgage-backed securities — 23.2 — 23.2 Other debt obligations — 11.0 — 11.0 Total fixed maturities 9.2 119.2 — 128.4 Short-term investments — 0.4 — 0.4 Cash equivalents 487.3 — — 487.3 Total assets at fair value $ 496.5 $ 119.6 $ — $ 616.1
Schedule of Carrying Amounts and Fair Values of Financial Instruments	As of September 30, 2023 and December 31, 2022, the carrying amounts and fair values of these financial instruments were as follows: Carrying Amount as of September 30, 2023 Estimated Fair Value as of September 30, 2023 Carrying Amount as of December 31, 2022 Estimated Fair Value as of December 31, 2022 (dollars in millions) Long-term debt $ 298.3 $ 304.8 $ 295.4 $ 309.7

LOSS AND LOSS ADJUSTMENT EXPE_2

LOSS AND LOSS ADJUSTMENT EXPENSE RESERVES (Tables)	9 Months Ended
	Sep. 30, 2023
Insurance [Abstract]
Schedule of Reconciliation of Reserve Balances for Loss and LAE, Net of Reinsurance	The following provides a reconciliation of the beginning and ending reserve balances for loss and LAE, net of reinsurance: Nine Months Ended September 30, 2023 2022 (dollars in millions) Gross loss and LAE reserves, January 1 $ 287.4 $ 320.2 Reinsurance recoverable on unpaid losses (76.4) (79.5) Net loss and LAE reserves, January 1 211.0 240.7 Net incurred loss and LAE related to: Current year 209.2 273.5 Prior years (0.6) (0.2) Total incurred 208.6 273.3 Net paid loss and LAE related to: Current year 87.4 155.5 Prior years 117.3 135.6 Total paid 204.7 291.1 Net loss and LAE reserves, September 30 214.9 222.9 Plus reinsurance recoverable on unpaid losses 41.6 71.3 Gross loss and LAE reserves, September 30 $ 256.5 $ 294.2

REINSURANCE (Tables)

REINSURANCE (Tables)	9 Months Ended
	Sep. 30, 2023
Insurance [Abstract]
Schedule of Comprehensive Loss For Reinsurance	The following table reflects amounts affecting the condensed consolidated statements of operations and comprehensive loss for reinsurance for the three and nine months ended September 30, 2023 and 2022: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (dollars in millions) Premiums written: Direct $ 192.7 $ 139.6 $ 444.6 $ 443.9 Assumed 31.5 11.1 59.3 34.1 Ceded (22.3) (81.0) (159.4) (264.5) Net premiums written $ 201.9 $ 69.7 $ 344.5 $ 213.5 Premiums earned: Direct $ 141.6 $ 144.5 $ 381.9 $ 469.3 Assumed 18.2 10.8 39.5 31.5 Ceded (59.8) (86.7) (197.5) (279.2) Net premiums earned $ 100.0 $ 68.6 $ 223.9 $ 221.6 Losses and LAE incurred: Direct $ 106.8 $ 126.1 $ 297.1 $ 430.0 Assumed 13.4 11.3 29.8 35.7 Ceded (34.4) (56.5) (118.3) (192.4) Net losses and LAE incurred $ 85.8 $ 80.9 $ 208.6 $ 273.3 Gross premiums written by state is as follows for the three and nine months ended September 30, 2023 and 2022: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Amount % of Total Amount % of Total Amount % of Total Amount % of Total (dollars in millions) State: Texas $ 36.8 16.4 % $ 26.2 17.4 % $ 80.1 15.9 % $ 89.5 18.7 % Georgia 26.3 11.7 15.0 10.0 56.0 11.1 48.8 10.2 Colorado 15.3 6.8 10.3 6.8 37.8 7.5 30.8 6.4 Pennsylvania 12.1 5.4 9.1 6.0 29.0 5.8 26.8 5.6 South Carolina 11.8 5.3 4.5 3.0 28.6 5.7 16.4 3.4 Utah 8.3 3.7 8.0 5.3 22.9 4.5 24.1 5.0 Arizona 11.0 4.9 4.3 2.9 21.7 4.3 13.3 2.8 Ohio 8.4 3.7 3.9 2.6 16.9 3.4 11.8 2.5 Oklahoma 7.2 3.2 5.2 3.5 16.7 3.3 16.1 3.4 Missouri 8.7 3.9 4.3 2.9 16.1 3.2 14.2 3.0 All others states 78.3 35.0 59.9 39.6 178.1 35.3 186.2 39.0 Total $ 224.2 100.0 % $ 150.7 100.0 % $ 503.9 100.0 % $ 478.0 100.0 %

LONG-TERM DEBT (Tables)

LONG-TERM DEBT (Tables)	9 Months Ended
	Sep. 30, 2023
Debt Disclosure [Abstract]
Schedule of Long Term Debt	The following summarizes the carrying value of long-term debt as of September 30, 2023 and December 31, 2022: September 30, 2023 December 31, 2022 (dollars in millions) Term Loan $ 300.0 $ 300.0 Accrued interest payable 7.9 7.3 Unamortized discount, debt issuance costs and warrants (9.6) (11.9) Total $ 298.3 $ 295.4

RESTRUCTURING COSTS (Tables)

RESTRUCTURING COSTS (Tables)	9 Months Ended
	Sep. 30, 2023
Restructuring and Related Activities [Abstract]
Restructuring Costs	The following table displays restructuring costs recorded in general and administrative expenses on the condensed consolidated statements of operations and comprehensive loss: Three Months Ended September 30, Nine Months Ended September 30, Cumulative Incurred Through September 30, 2023 2023 2022 2023 2022 (dollars in millions) Restructuring costs: Employee costs $ 1.8 $ — $ 5.9 $ 5.6 $ 21.4 Real estate exit costs — — — 2.1 2.1 Other costs 0.1 — 3.5 0.7 4.5 Total restructuring costs $ 1.9 $ — $ 9.4 $ 8.4 $ 28.0 Employee costs Other costs Total liability (dollars in millions) Restructuring activity: Restructuring liability as of January 1, 2023 $ 3.1 $ 0.1 $ 3.2 Expense incurred 5.5 3.4 8.9 Payments (2.0) (3.5) (5.5) Restructuring liability as of September 30, 2023 $ 6.6 $ — $ 6.6

SHARE-BASED COMPENSATION (Table

SHARE-BASED COMPENSATION (Tables)	9 Months Ended
	Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]
Schedule of Share-Based Compensation Expense	The following table displays warrant compensation expense recorded in the condensed consolidated statements of operations and comprehensive loss: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (dollars in millions) Warrant compensation expense: Sales and marketing $ — $ — $ — $ 8.8 Other insurance expense (benefit) 5.0 1.5 13.3 1.5 Total warrant compensation expense $ 5.0 $ 1.5 $ 13.3 $ 10.3 The following table displays share-based compensation expense recorded in the condensed consolidated statements of operations and comprehensive loss: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (dollars in millions) Share-based compensation expense: Loss and loss adjustment expenses $ 0.2 $ 0.2 $ 0.5 $ 0.6 Sales and marketing 0.1 0.3 0.3 0.7 Other insurance expense (benefit) 0.1 0.3 0.4 0.8 Technology and development 0.9 1.1 2.4 3.1 General and administrative 3.4 5.9 8.8 16.6 Total share-based compensation expense $ 4.7 $ 7.8 $ 12.4 $ 21.8 The following table provides total share-based compensation expense by type of award: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (dollars in millions) Share-based compensation expense: Restricted stock unit expense $ 4.4 $ 7.4 $ 11.4 $ 20.5 Performance-based restricted stock unit expense 0.1 — 0.1 — Stock option expense 0.2 0.4 0.9 1.3 Total share-based compensation expense $ 4.7 $ 7.8 $ 12.4 $ 21.8
Summary of Performance Stock Units	The following table provides other key terms of the PSUs: Performance-Based Restricted Stock Units Stock Price Goals Shares Issued Grant Date Fair Value per Share (in millions, except per share amounts) Tranches: Tranche 1 $ 16.76 — $ 7.69 Tranche 2 25.14 0.1 6.70 Tranche 3 33.52 0.1 5.87 Tranche 4 $ 41.90 0.2 $ 5.10 0.4
Summary of RSU Activity	A summary of RSU and PSU activity for the nine months ended September 30, 2023 is as follows: Nine Months Ended September 30, 2023 Restricted Stock Units and Performance-Based Restricted Stock Units Number of Shares Weighted-Average Aggregate Intrinsic Value (in millions, except per share amounts) Nonvested at January 1, 2023 1.1 $ 51.81 $ 5.0 Granted 1.6 6.62 Vested (0.5) 50.44 2.8 Forfeited, expired or canceled (0.2) 53.75 Nonvested at September 30, 2023 2.0 $ 15.79 $ 18.9
Summary of Option Activity	A summary of option activity for the nine months ended September 30, 2023 is as follows: Nine Months Ended September 30, 2023 Options Number of Shares Weighted-Average Exercise Price Weighted-Average Remaining Contractual Term (in Years) Aggregate Intrinsic Value (in millions, except exercise price and term amounts) Outstanding and exercisable at January 1, 2023 0.2 $ 38.15 5.63 $ 0.2 Granted — 8.94 Exercised — — — Forfeited, expired or canceled (0.1) 44.86 Outstanding and exercisable at September 30, 2023 0.1 $ 33.74 4.53 $ 0.5

OTHER COMPREHENSIVE LOSS AND _2

OTHER COMPREHENSIVE LOSS AND ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME (Tables)	9 Months Ended
	Sep. 30, 2023
Equity [Abstract]
Schedule of AOCI	The following table presents the changes in our accumulated other comprehensive (loss) income, or AOCI, for the three and nine months ended September 30, 2023 and 2022: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (dollars in millions) Beginning balance $ (5.9) $ (4.6) $ (5.8) $ 0.4 Other comprehensive loss before reclassifications (0.7) (2.3) (0.8) (7.4) Net realized losses on investments reclassified from AOCI to net loss — — — 0.1 Other comprehensive loss (0.7) (2.3) (0.8) (7.3) Ending balance $ (6.6) $ (6.9) $ (6.6) $ (6.9)

LOSS PER SHARE (Tables)

LOSS PER SHARE (Tables)	9 Months Ended
	Sep. 30, 2023
Earnings Per Share [Abstract]
Schedule of Earnings Per Share	The following table displays the computation of basic and diluted loss per share for both Class A and Class B common stock for the three and nine months ended September 30, 2023 and 2022: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (in millions, except per share amounts) Net loss $ (45.8) $ (66.4) $ (123.4) $ (239.4) Weighted-average common shares outstanding: basic and diluted (both Class A and B) 14.5 14.1 14.4 14.0 Loss per common share: basic and diluted (both Class A and B) $ (3.16) $ (4.71) $ (8.57) $ (17.10)
Schedule of Anti-Dilutive Securities	We excluded the following potentially dilutive common stock equivalents, presented based on amounts outstanding at each period end, from the computation of diluted loss per share attributable to common shareholders for the periods indicated because including them would have had an anti-dilutive effect: As of September 30, 2023 2022 (in millions) Options to purchase common stock 0.1 0.2 Nonvested shares subject to repurchase 0.1 0.1 Restricted stock units and performance-based restricted stock units 2.0 1.3 Redeemable convertible preferred stock (as converted to common stock) 0.8 0.8 Warrants to purchase common stock 7.7 7.7 Total 10.7 10.1

GEOGRAPHICAL BREAKDOWN OF GRO_2

GEOGRAPHICAL BREAKDOWN OF GROSS PREMIUMS WRITTEN (Tables)	9 Months Ended
	Sep. 30, 2023
Insurance [Abstract]
Schedule of Direct and Assumed Premiums Written	The following table reflects amounts affecting the condensed consolidated statements of operations and comprehensive loss for reinsurance for the three and nine months ended September 30, 2023 and 2022: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (dollars in millions) Premiums written: Direct $ 192.7 $ 139.6 $ 444.6 $ 443.9 Assumed 31.5 11.1 59.3 34.1 Ceded (22.3) (81.0) (159.4) (264.5) Net premiums written $ 201.9 $ 69.7 $ 344.5 $ 213.5 Premiums earned: Direct $ 141.6 $ 144.5 $ 381.9 $ 469.3 Assumed 18.2 10.8 39.5 31.5 Ceded (59.8) (86.7) (197.5) (279.2) Net premiums earned $ 100.0 $ 68.6 $ 223.9 $ 221.6 Losses and LAE incurred: Direct $ 106.8 $ 126.1 $ 297.1 $ 430.0 Assumed 13.4 11.3 29.8 35.7 Ceded (34.4) (56.5) (118.3) (192.4) Net losses and LAE incurred $ 85.8 $ 80.9 $ 208.6 $ 273.3 Gross premiums written by state is as follows for the three and nine months ended September 30, 2023 and 2022: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Amount % of Total Amount % of Total Amount % of Total Amount % of Total (dollars in millions) State: Texas $ 36.8 16.4 % $ 26.2 17.4 % $ 80.1 15.9 % $ 89.5 18.7 % Georgia 26.3 11.7 15.0 10.0 56.0 11.1 48.8 10.2 Colorado 15.3 6.8 10.3 6.8 37.8 7.5 30.8 6.4 Pennsylvania 12.1 5.4 9.1 6.0 29.0 5.8 26.8 5.6 South Carolina 11.8 5.3 4.5 3.0 28.6 5.7 16.4 3.4 Utah 8.3 3.7 8.0 5.3 22.9 4.5 24.1 5.0 Arizona 11.0 4.9 4.3 2.9 21.7 4.3 13.3 2.8 Ohio 8.4 3.7 3.9 2.6 16.9 3.4 11.8 2.5 Oklahoma 7.2 3.2 5.2 3.5 16.7 3.3 16.1 3.4 Missouri 8.7 3.9 4.3 2.9 16.1 3.2 14.2 3.0 All others states 78.3 35.0 59.9 39.6 178.1 35.3 186.2 39.0 Total $ 224.2 100.0 % $ 150.7 100.0 % $ 503.9 100.0 % $ 478.0 100.0 %

NATURE OF BUSINESS (Details)

NATURE OF BUSINESS (Details)	Sep. 30, 2023
Root Insurance Company
Schedule of Equity Method Investments [Line Items]
Ownership percentage (as percent)	100%
Root Property & Casualty Insurance Company
Schedule of Equity Method Investments [Line Items]
Ownership percentage (as percent)	100%
Root Reinsurance Company, Ltd.
Schedule of Equity Method Investments [Line Items]
Ownership percentage (as percent)	100%

BASIS OF PRESENTATION AND SUM_4

BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Error Correction (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2021
Condensed consolidated statements of operations and comprehensive loss:
Sales and marketing	$ 13.1	$ 8.1	$ 22.8	$ 44.8
General and administrative	21	26.4	63.2	96.4
Total operating expenses	149.3	130.8	349.2	454.9
Operating loss	(34)	(57.1)	(89)	(215.4)
Loss before income tax expense	(45.8)	(66.4)	(123.4)	(239.4)
Net loss	(45.8)	(66.4)	(123.4)	(239.4)
Comprehensive loss	$ (46.5)	$ (68.7)	$ (124.2)	$ (246.7)
Weighted-average common shares outstanding: basic (both Class A and B) (in shares)	14.5	14.1	14.4	14
Weighted-average common shares outstanding: diluted (both Class A and B) (in shares)	14.5	14.1	14.4	14
Loss per common share: basic (both Class A and B) (in dollars per share)	$ (3.16)	$ (4.71)	$ (8.57)	$ (17.10)
Loss per common share: diluted (both Class A and B) (in dollars per share)	$ (3.16)	$ (4.71)	$ (8.57)	$ (17.10)
Condensed consolidated statement of redeemable convertible preferred stock and stockholders’ equity:
Total stockholders’ equity	$ 177.1	$ 321.8	$ 177.1	$ 321.8	$ 214.4	$ 277.1	$ 381.3	$ 536.4
Condensed consolidated statement of cash flows:
Net loss	(45.8)	(66.4)	(123.4)	(239.4)
Other assets			10.6	(2)
Net cash used in operating activities			(79.7)	(163.9)
Accumulated Loss
Condensed consolidated statements of operations and comprehensive loss:
Net loss	(45.8)	(66.4)	(123.4)	(239.4)
Condensed consolidated statement of redeemable convertible preferred stock and stockholders’ equity:
Total stockholders’ equity	(1,691.2)	(1,509.5)	(1,691.2)	(1,509.5)	$ (1,645.4)	$ (1,567.8)	$ (1,443.1)	$ (1,270.1)
Condensed consolidated statement of cash flows:
Net loss	$ (45.8)	(66.4)	$ (123.4)	(239.4)
As reported
Condensed consolidated statements of operations and comprehensive loss:
Sales and marketing		5.7		45.8
General and administrative		26.4		86.3
Total operating expenses		128.4		445.8
Operating loss		(54.7)		(206.3)
Loss before income tax expense		(64)		(230.3)
Net loss		(64)		(230.3)
Comprehensive loss		$ (66.3)		$ (237.6)
Weighted-average common shares outstanding: basic (both Class A and B) (in shares)		14.1		14
Weighted-average common shares outstanding: diluted (both Class A and B) (in shares)		14.1		14
Loss per common share: basic (both Class A and B) (in dollars per share)		$ (4.54)		$ (16.45)
Loss per common share: diluted (both Class A and B) (in dollars per share)		$ (4.54)		$ (16.45)
Condensed consolidated statement of redeemable convertible preferred stock and stockholders’ equity:
Total stockholders’ equity		$ 330.9		$ 330.9
Condensed consolidated statement of cash flows:
Net loss		(64)		(230.3)
Other assets				(11.1)
Net cash used in operating activities				(163.9)
As reported | Accumulated Loss
Condensed consolidated statement of redeemable convertible preferred stock and stockholders’ equity:
Total stockholders’ equity		(1,500.4)		(1,500.4)
Adjustments
Condensed consolidated statements of operations and comprehensive loss:
Sales and marketing		2.4		(1)
General and administrative		0		10.1
Total operating expenses		2.4		9.1
Operating loss		(2.4)		(9.1)
Loss before income tax expense		(2.4)		(9.1)
Net loss		(2.4)		(9.1)
Comprehensive loss		(2.4)		(9.1)
Condensed consolidated statement of redeemable convertible preferred stock and stockholders’ equity:
Total stockholders’ equity		(9.1)		(9.1)
Condensed consolidated statement of cash flows:
Net loss		(2.4)		(9.1)
Other assets				9.1
Adjustments | Accumulated Loss
Condensed consolidated statement of redeemable convertible preferred stock and stockholders’ equity:
Total stockholders’ equity		$ (9.1)		$ (9.1)

BASIS OF PRESENTATION AND SUM_5

BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Accounting Policies [Abstract]
Cash and cash equivalents	$ 635.3	$ 762.1
Restricted cash	1	1
Total cash, cash equivalents and restricted cash shown in the condensed consolidated statements of cash flows	$ 636.3	$ 763.1	$ 820.7	$ 707

BASIS OF PRESENTATION AND SUM_6

BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) shares in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2023 consecutive_trading_day shares	Sep. 30, 2023 shares
Class A Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Consecutive trading days | consecutive_trading_day	45
Performance-based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) | shares	0.4	0.4
Volatility rate	50%	76%
Weighted average volatility rate	50%
Minimum | Performance-based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Maximum | Performance-based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years

INVESTMENTS - Amortized Cost an

INVESTMENTS - Amortized Cost and Fair Value (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 173.7	$ 134.6
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	0	0.1
Gross Unrealized Losses	(6.6)	(5.9)
Fair Value	167.1	128.8
U.S. Treasury securities and agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	16.8	11.3
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(0.4)	(0.3)
Fair Value	16.4	11
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	25.6	21.4
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1.3)	(1.2)
Fair Value	24.3	20.2
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	69.4	60.5
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(2.9)	(2.7)
Fair Value	66.5	57.8
Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	12.3	5.5
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(0.5)	(0.3)
Fair Value	11.8	5.2
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	31	24.4
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1.3)	(1.2)
Fair Value	29.7	23.2
Other debt obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	16	11.1
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	0	0.1
Gross Unrealized Losses	(0.2)	(0.2)
Fair Value	15.8	11
Total fixed maturities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	171.1	134.2
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	0	0.1
Gross Unrealized Losses	(6.6)	(5.9)
Fair Value	164.5	128.4
Short-term investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2.6	0.4
Allowance for Expected Credit Losses	0	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	$ 2.6	$ 0.4

INVESTMENTS - Unrealized Losses

INVESTMENTS - Unrealized Losses (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less than 12 months, fair value	$ 77.8	$ 91.1
Less than 12 months, unrealized loss	(1.9)	(3.2)
12 months or more, fair value	83.5	30.3
12 months or more, unrealized loss	(4.7)	(2.7)
Total, fair value	161.3	121.4
Total, unrealized loss	(6.6)	(5.9)
U.S. Treasury securities and agencies
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less than 12 months, fair value	10.2	6.9
Less than 12 months, unrealized loss	(0.2)	(0.1)
12 months or more, fair value	6.2	4.1
12 months or more, unrealized loss	(0.2)	(0.2)
Total, fair value	16.4	11
Total, unrealized loss	(0.4)	(0.3)
Municipal securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less than 12 months, fair value	7.9	11.5
Less than 12 months, unrealized loss	(0.2)	(0.5)
12 months or more, fair value	15.7	8.2
12 months or more, unrealized loss	(1.1)	(0.7)
Total, fair value	23.6	19.7
Total, unrealized loss	(1.3)	(1.2)
Corporate debt securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less than 12 months, fair value	27.1	45.3
Less than 12 months, unrealized loss	(0.8)	(1.6)
12 months or more, fair value	39.3	11.5
12 months or more, unrealized loss	(2.1)	(1.1)
Total, fair value	66.4	56.8
Total, unrealized loss	(2.9)	(2.7)
Residential mortgage-backed securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less than 12 months, fair value	8.5	2.2
Less than 12 months, unrealized loss	(0.2)	0
12 months or more, fair value	2.7	1.9
12 months or more, unrealized loss	(0.3)	(0.3)
Total, fair value	11.2	4.1
Total, unrealized loss	(0.5)	(0.3)
Commercial mortgage-backed securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less than 12 months, fair value	13.5	18.3
Less than 12 months, unrealized loss	(0.4)	(0.8)
12 months or more, fair value	15.8	4.6
12 months or more, unrealized loss	(0.9)	(0.4)
Total, fair value	29.3	22.9
Total, unrealized loss	(1.3)	(1.2)
Other debt obligations
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less than 12 months, fair value	9.5	6.8
Less than 12 months, unrealized loss	(0.1)	(0.2)
12 months or more, fair value	3.8	0
12 months or more, unrealized loss	(0.1)	0
Total, fair value	13.3	6.8
Total, unrealized loss	(0.2)	(0.2)
Total fixed maturities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less than 12 months, fair value	76.7	91
Less than 12 months, unrealized loss	(1.9)	(3.2)
12 months or more, fair value	83.5	30.3
12 months or more, unrealized loss	(4.7)	(2.7)
Total, fair value	160.2	121.3
Total, unrealized loss	(6.6)	(5.9)
Short-term investments
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less than 12 months, fair value	1.1	0.1
Less than 12 months, unrealized loss	0	0
12 months or more, fair value	0	0
12 months or more, unrealized loss	0	0
Total, fair value	1.1	0.1
Total, unrealized loss	$ 0	$ 0

INVESTMENTS - Other Investments

INVESTMENTS - Other Investments (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Other investments	$ 4,400,000		$ 4,400,000		$ 4,400,000
Realized gains on investments	$ 0	$ 0	$ 0	$ 1,200,000

INVESTMENTS - Gross and Net Rea

INVESTMENTS - Gross and Net Realized Gains and Losses (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Investments, Debt and Equity Securities [Abstract]
Realized gains on investments	$ 0	$ 0	$ 0	$ 1,200,000
Realized losses on investments	0	0	0	(100,000)
Net realized gains on investments	$ 0	$ 0	$ 0	$ 1,100,000

INVESTMENTS - Contractual Matur

INVESTMENTS - Contractual Maturity (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Amortized Cost
Due in one year or less	$ 33.3
Due after one year through five years	102.3
Due five years through 10 years	21.4
Due after 10 years	16.7
Amortized Cost	173.7	$ 134.6
Fair Value
Due in one year or less	32.8
Due after one year through five years	98.1
Due five years through 10 years	20.4
Due after 10 years	15.8
Total	$ 167.1	$ 128.8

INVESTMENTS - Net Investment In

INVESTMENTS - Net Investment Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Net Investment Income [Line Items]
Realized gain value	$ 9.3	$ 1.2	$ 23.1	$ 2.9
Investment expense	(0.3)	(0.3)	(0.6)	(0.7)
Net investment income	9	0.9	22.5	2.2
Interest on bonds
Net Investment Income [Line Items]
Realized gain value	1.4	0.6	3.3	1.7
Interest on deposits and cash equivalents
Net Investment Income [Line Items]
Realized gain value	$ 7.9	$ 0.6	$ 19.8	$ 1.2

INVESTMENTS - Credit Ratings (D

INVESTMENTS - Credit Ratings (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 173.7	$ 134.6
Fair Value	$ 167.1	$ 128.8
AFS securities | Credit rating
Debt Securities, Available-for-sale [Line Items]
Concentration percentage (in percent)	100%	100%
AAA
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 51.2	$ 62.5
Fair Value	$ 49.3	$ 59.9
AAA | AFS securities | Credit rating
Debt Securities, Available-for-sale [Line Items]
Concentration percentage (in percent)	29.50%	46.50%
AA+, AA, AA-, A-1
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 62.4	$ 19.9
Fair Value	$ 60.2	$ 19.1
AA+, AA, AA-, A-1 | AFS securities | Credit rating
Debt Securities, Available-for-sale [Line Items]
Concentration percentage (in percent)	36%	14.80%
A+, A, A-
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 46.3	$ 38.4
Fair Value	$ 44.2	$ 36.5
A+, A, A- | AFS securities | Credit rating
Debt Securities, Available-for-sale [Line Items]
Concentration percentage (in percent)	26.50%	28.30%
BBB+, BBB, BBB-
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 13.8	$ 13.8
Fair Value	$ 13.4	$ 13.3
BBB+, BBB, BBB- | AFS securities | Credit rating
Debt Securities, Available-for-sale [Line Items]
Concentration percentage (in percent)	8%	10.40%

FAIR VALUE OF FINANCIAL INSTR_3

FAIR VALUE OF FINANCIAL INSTRUMENTS - Balance Sheet Grouping (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Assets
AFS securities	$ 167.1	$ 128.8
Cash equivalents	363.6	487.3
Total assets at fair value	530.7	616.1
U.S. Treasury securities and agencies
Assets
AFS securities	16.4	11
Municipal securities
Assets
AFS securities	24.3	20.2
Corporate debt securities
Assets
AFS securities	66.5	57.8
Residential mortgage-backed securities
Assets
AFS securities	11.8	5.2
Commercial mortgage-backed securities
Assets
AFS securities	29.7	23.2
Other debt obligations
Assets
AFS securities	15.8	11
Total fixed maturities
Assets
AFS securities	164.5	128.4
Short-term investments
Assets
AFS securities	2.6	0.4
Level 1
Assets
Cash equivalents	363.6	487.3
Total assets at fair value	381.4	496.5
Level 1 | U.S. Treasury securities and agencies
Assets
AFS securities	15.4	9.2
Level 1 | Municipal securities
Assets
AFS securities	0	0
Level 1 | Corporate debt securities
Assets
AFS securities	0	0
Level 1 | Residential mortgage-backed securities
Assets
AFS securities	0	0
Level 1 | Commercial mortgage-backed securities
Assets
AFS securities	0	0
Level 1 | Other debt obligations
Assets
AFS securities	0	0
Level 1 | Total fixed maturities
Assets
AFS securities	15.4	9.2
Level 1 | Short-term investments
Assets
AFS securities	2.4	0
Level 2
Assets
Cash equivalents	0	0
Total assets at fair value	149.3	119.6
Level 2 | U.S. Treasury securities and agencies
Assets
AFS securities	1	1.8
Level 2 | Municipal securities
Assets
AFS securities	24.3	20.2
Level 2 | Corporate debt securities
Assets
AFS securities	66.5	57.8
Level 2 | Residential mortgage-backed securities
Assets
AFS securities	11.8	5.2
Level 2 | Commercial mortgage-backed securities
Assets
AFS securities	29.7	23.2
Level 2 | Other debt obligations
Assets
AFS securities	15.8	11
Level 2 | Total fixed maturities
Assets
AFS securities	149.1	119.2
Level 2 | Short-term investments
Assets
AFS securities	0.2	0.4
Level 3
Assets
Cash equivalents	0	0
Total assets at fair value	0	0
Level 3 | U.S. Treasury securities and agencies
Assets
AFS securities	0	0
Level 3 | Municipal securities
Assets
AFS securities	0	0
Level 3 | Corporate debt securities
Assets
AFS securities	0	0
Level 3 | Residential mortgage-backed securities
Assets
AFS securities	0	0
Level 3 | Commercial mortgage-backed securities
Assets
AFS securities	0	0
Level 3 | Other debt obligations
Assets
AFS securities	0	0
Level 3 | Total fixed maturities
Assets
AFS securities	0	0
Level 3 | Short-term investments
Assets
AFS securities	$ 0	$ 0

FAIR VALUE OF FINANCIAL INSTR_4

FAIR VALUE OF FINANCIAL INSTRUMENTS - Long Term Debt (Details) - Level 2 - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Carrying amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 298.3	$ 295.4
Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 304.8	$ 309.7

LOSS AND LOSS ADJUSTMENT EXPE_3

LOSS AND LOSS ADJUSTMENT EXPENSE RESERVES - Schedule of Reserve Balance (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Gross loss and LAE reserves, January 1			$ 287.4	$ 320.2
Reinsurance recoverable on unpaid losses			(76.4)	(79.5)
Net loss and LAE reserves, January 1	$ 214.9	$ 222.9	214.9	222.9	$ 211	$ 240.7
Net incurred loss and LAE related to:
Current year			209.2	273.5
Prior years			(0.6)	(0.2)
Total incurred	85.8	80.9	208.6	273.3
Net paid loss and LAE related to:
Current year			87.4	155.5
Prior years			117.3	135.6
Total paid			204.7	291.1
Net loss and LAE reserves, September 30	214.9	222.9	214.9	222.9
Plus reinsurance recoverable on unpaid losses	41.6	71.3	41.6	71.3
Gross loss and LAE reserves, September 30	$ 256.5	$ 294.2	$ 256.5	$ 294.2

LOSS AND LOSS ADJUSTMENT EXPE_4

LOSS AND LOSS ADJUSTMENT EXPENSE RESERVES - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Insurance [Abstract]
Incurred losses and LAE attributable to prior accident years	$ 0.6	$ 0.2

REINSURANCE (Details)

REINSURANCE (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Premiums written:
Direct	$ 192.7	$ 139.6	$ 444.6	$ 443.9
Assumed	31.5	11.1	59.3	34.1
Ceded	(22.3)	(81)	(159.4)	(264.5)
Net premiums written	201.9	69.7	344.5	213.5
Premiums earned:
Direct	141.6	144.5	381.9	469.3
Assumed	18.2	10.8	39.5	31.5
Ceded	(59.8)	(86.7)	(197.5)	(279.2)
Net premiums earned	100	68.6	223.9	221.6
Losses and LAE incurred:
Direct	106.8	126.1	297.1	430
Assumed	13.4	11.3	29.8	35.7
Ceded	(34.4)	(56.5)	(118.3)	(192.4)
Net losses and LAE incurred	$ 85.8	$ 80.9	$ 208.6	$ 273.3

REINSURANCE - Narrative (Detail

REINSURANCE - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Effects of Reinsurance [Line Items]
Increase of net premiums earned	$ 4.4
Expense related to allowance for credit loss	2.8
Cash and cash equivalents	635.3	$ 635.3		$ 762.1
Reinsurance recoverable and receivable		8.5	$ 19
Prepaid reinsurance premiums		38.1	14.6
Reinsurance premiums payable		48	$ (8.8)
Commutation of Certain Agreements
Effects of Reinsurance [Line Items]
Cash and cash equivalents	3.9	$ 3.9
Reinsurance recoverable and receivable	6.1
Prepaid reinsurance premiums	33.5
Reinsurance premiums payable	30.2
Loss and loss adjustment expenses
Effects of Reinsurance [Line Items]
Incurred expense for commutations of certain reinsurance agreements	4.2
Other insurance expense (benefit)
Effects of Reinsurance [Line Items]
Incurred expense for commutations of certain reinsurance agreements	$ 5.8

LONG-TERM DEBT - Narrative (Det

LONG-TERM DEBT - Narrative (Details) - Term Loan - USD ($)		1 Months Ended
	Jan. 27, 2022	Jan. 31, 2022
SOFR
Debt Instrument [Line Items]
Debt instrument, floor interest rate (in percent)	1%
Variable rate percentage (in percent)	9%
Secured debt
Debt Instrument [Line Items]
Debt amount		$ 300,000,000
Debt instrument, term		5 years

LONG-TERM DEBT - Schedule Of De

LONG-TERM DEBT - Schedule Of Debt (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Accrued interest payable	$ 7.9	$ 7.3
Unamortized discount, debt issuance costs and warrants	(9.6)	(11.9)
Total	298.3	295.4
Secured debt | Term Loan
Debt Instrument [Line Items]
Term Loan	$ 300	$ 300

INCOME TAXES (Details)

INCOME TAXES (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Effective income tax rate	0%	0%	0%	0%
Federal income tax rate (in percent)			21%

RESTRUCTURING COSTS - Narrative

RESTRUCTURING COSTS - Narrative (Details) $ in Millions	Sep. 30, 2023 USD ($)
Restructuring and Related Activities [Abstract]
Restructuring and related cost, expected cost	$ 1.7

RESTRUCTURING COSTS - Restructu

RESTRUCTURING COSTS - Restructuring Costs Recorded In Consolidated Statements Of Operations And Comprehensive Loss (Details) - General and administrative - USD ($) $ in Millions	3 Months Ended		9 Months Ended		21 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023
Restructuring Cost and Reserve [Line Items]
Total restructuring costs	$ 1.9	$ 0	$ 9.4	$ 8.4	$ 28
Employee costs
Restructuring Cost and Reserve [Line Items]
Total restructuring costs	1.8	0	5.9	5.6	21.4
Real estate exit costs
Restructuring Cost and Reserve [Line Items]
Total restructuring costs	0	0	0	2.1	2.1
Other costs
Restructuring Cost and Reserve [Line Items]
Total restructuring costs	$ 0.1	$ 0	$ 3.5	$ 0.7	$ 4.5

RESTRUCTURING COSTS - Restruc_2

RESTRUCTURING COSTS - Restructuring Costs Recorded In Consolidated Balance Sheets (Details) $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($)
Restructuring activity:
Restructuring liability, beginning balance	$ 3.2
Expense incurred	8.9
Payments	(5.5)
Restructuring liability, ending balance	6.6
Employee costs
Restructuring activity:
Restructuring liability, beginning balance	3.1
Expense incurred	5.5
Payments	(2)
Restructuring liability, ending balance	6.6
Other costs
Restructuring activity:
Restructuring liability, beginning balance	0.1
Expense incurred	3.4
Payments	(3.5)
Restructuring liability, ending balance	$ 0

SHARE-BASED COMPENSATION - Narr

SHARE-BASED COMPENSATION - Narrative (Details) shares in Millions, $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2023 USD ($) shares	Sep. 30, 2023 USD ($) shares	Oct. 31, 2021 tranche shares
2020 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for issuance (in shares) | shares	1.2	1.2
Warrant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 7.8	$ 7.8
Unrecognized compensation cost, period of recognition		1 year
Stock option expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost, period of recognition		3 years
Unrecognized compensation cost, options	1.2	$ 1.2
Restricted stock unit expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	25.3	$ 25.3
Unrecognized compensation cost, period of recognition		4 years
Performance-based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 2.2	$ 2.2
Expected term		5 years
Risk-free interest rate		4.06%
Dividend rate		0%
Volatility rate	50%	76%
Class A Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued (in shares) | shares			7.2
Short Term Warrant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of tranches | tranche			3
Long Term Warrant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of tranches | tranche			5
Carvana
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of tranches | tranche			8

SHARE-BASED COMPENSATION - Warr

SHARE-BASED COMPENSATION - Warrant Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	$ 4.7	$ 7.8	$ 12.4	$ 21.8
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	0.1	0.3	0.3	0.7
Other insurance expense (benefit)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	0.1	0.3	0.4	0.8
Warrant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	5	1.5	13.3	10.3
Warrant | Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	0	0	0	8.8
Warrant | Other insurance expense (benefit)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	$ 5	$ 1.5	$ 13.3	$ 1.5

SHARE-BASED COMPENSATION - Shar

SHARE-BASED COMPENSATION - Share-based Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total share-based compensation expense	$ 4.7	$ 7.8	$ 12.4	$ 21.8
Restricted stock unit expense
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total share-based compensation expense	4.4	7.4	11.4	20.5
Performance-based restricted stock unit expense
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total share-based compensation expense	0.1	0	0.1	0
Stock option expense
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total share-based compensation expense	0.2	0.4	0.9	1.3
Loss and loss adjustment expenses
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total share-based compensation expense	0.2	0.2	0.5	0.6
Sales and marketing
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total share-based compensation expense	0.1	0.3	0.3	0.7
Other insurance expense (benefit)
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total share-based compensation expense	0.1	0.3	0.4	0.8
Technology and development
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total share-based compensation expense	0.9	1.1	2.4	3.1
General and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total share-based compensation expense	$ 3.4	$ 5.9	$ 8.8	$ 16.6

SHARE-BASED COMPENSATION - Perf

SHARE-BASED COMPENSATION - Performance Stock Units (Details) - Performance-based RSUs - $ / shares shares in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	0.4	0.4
Tranche 1
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock price (in dollars per share)		$ 16.76
Granted (in shares)		0
Granted (in dollars per share)		$ 7.69
Tranche 2
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock price (in dollars per share)		$ 25.14
Granted (in shares)		0.1
Granted (in dollars per share)		$ 6.70
Tranche 3
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock price (in dollars per share)		$ 33.52
Granted (in shares)		0.1
Granted (in dollars per share)		$ 5.87
Tranche 4
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock price (in dollars per share)		$ 41.90
Granted (in shares)		0.2
Granted (in dollars per share)		$ 5.10

SHARE-BASED COMPENSATION - RSU

SHARE-BASED COMPENSATION - RSU Activity (Details) - Restricted stock unit expense $ / shares in Units, shares in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($) $ / shares shares
Number of Shares
Beginning balance (in shares) | shares	1.1
Granted (in shares) | shares	1.6
Vested (in shares) | shares	(0.5)
Forfeited, expired or canceled (in shares) | shares	(0.2)
Ending balance (in shares) | shares	2
Weighted-Average Grant Date Fair Value per Share
Beginning balance (in dollars per share) | $ / shares	$ 51.81
Granted (in dollars per share) | $ / shares	6.62
Vested (in dollars per share) | $ / shares	50.44
Forfeited, expired or canceled (in dollars per share) | $ / shares	53.75
Ending balance (in dollars per share) | $ / shares	$ 15.79
Aggregate Intrinsic Value
Beginning balance | $	$ 5
Vested | $	2.8
Ending balance | $	$ 18.9

SHARE-BASED COMPENSATION - Opti

SHARE-BASED COMPENSATION - Option Activity (Details) $ / shares in Units, shares in Millions, $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2023 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares
Number of Shares
Outstanding, beginning balance (in shares) | shares	0.2
Granted (in shares) | shares	0
Exercised (in shares) | shares	0
Forfeited, expired or canceled (in shares) | shares	(0.1)
Outstanding, ending balance (in shares) | shares	0.1	0.2
Weighted-Average Exercise Price
Outstanding, beginning balance (in dollars per share) | $ / shares	$ 38.15
Granted (in dollars per share) | $ / shares	8.94
Exercised (in dollars per share) | $ / shares	0
Forfeited, expired and canceled (in dollars per share) | $ / shares	44.86
Outstanding, ending balance (in dollars per share) | $ / shares	$ 33.74	$ 38.15
Outstanding, weighted-average remaining contractual term (in years)	4 years 6 months 10 days	5 years 7 months 17 days
Outstanding, aggregate intrinsic value | $	$ 0.5	$ 0.2
Exercised, aggregate intrinsic value | $	$ 0

OTHER COMPREHENSIVE LOSS AND _3

OTHER COMPREHENSIVE LOSS AND ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 214.4	$ 381.3	$ 277.1	$ 536.4
Other comprehensive loss	(0.7)	(2.3)	(0.8)	(7.3)
Ending balance	177.1	321.8	177.1	321.8
Change in net unrealized gains (losses) on investments:
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(5.9)	(4.6)	(5.8)	0.4
Other comprehensive loss before reclassifications	(0.7)	(2.3)	(0.8)	(7.4)
Net realized losses on investments reclassified from AOCI to net loss	0	0	0	0.1
Other comprehensive loss	(0.7)	(2.3)	(0.8)	(7.3)
Ending balance	$ (6.6)	$ (6.9)	$ (6.6)	$ (6.9)

LOSS PER SHARE - Schedule of Ba

LOSS PER SHARE - Schedule of Basic and Diluted Loss per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Net loss	$ (45.8)	$ (66.4)	$ (123.4)	$ (239.4)
Weighted-average common shares outstanding: basic (both Class A and B) (in shares)	14.5	14.1	14.4	14
Weighted-average common shares outstanding: diluted (both Class A and B) (in shares)	14.5	14.1	14.4	14
Loss per common share: basic (both Class A and B) (in dollars per share)	$ (3.16)	$ (4.71)	$ (8.57)	$ (17.10)
Loss per common share: diluted (both Class A and B) (in dollars per share)	$ (3.16)	$ (4.71)	$ (8.57)	$ (17.10)

LOSS PER SHARE - Schedule of An

LOSS PER SHARE - Schedule of Anti-Dilutive Securities (Details) - shares shares in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities (in shares)	10.7	10.1
Options to purchase common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities (in shares)	0.1	0.2
Nonvested shares subject to repurchase
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities (in shares)	0.1	0.1
Restricted stock units and performance-based restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities (in shares)	2	1.3
Redeemable convertible preferred stock (as converted to common stock)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities (in shares)	0.8	0.8
Warrants to purchase common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities (in shares)	7.7	7.7

GEOGRAPHICAL BREAKDOWN OF GRO_3

GEOGRAPHICAL BREAKDOWN OF GROSS PREMIUMS WRITTEN (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Effects of Reinsurance [Line Items]
Total	$ 224.2	$ 150.7	$ 503.9	$ 478
Texas
Effects of Reinsurance [Line Items]
Total	36.8	26.2	80.1	89.5
Georgia
Effects of Reinsurance [Line Items]
Total	26.3	15	56	48.8
Colorado
Effects of Reinsurance [Line Items]
Total	15.3	10.3	37.8	30.8
Pennsylvania
Effects of Reinsurance [Line Items]
Total	12.1	9.1	29	26.8
South Carolina
Effects of Reinsurance [Line Items]
Total	11.8	4.5	28.6	16.4
Utah
Effects of Reinsurance [Line Items]
Total	8.3	8	22.9	24.1
Arizona
Effects of Reinsurance [Line Items]
Total	11	4.3	21.7	13.3
Ohio
Effects of Reinsurance [Line Items]
Total	8.4	3.9	16.9	11.8
Oklahoma
Effects of Reinsurance [Line Items]
Total	7.2	5.2	16.7	16.1
Missouri
Effects of Reinsurance [Line Items]
Total	8.7	4.3	16.1	14.2
All others states
Effects of Reinsurance [Line Items]
Total	$ 78.3	$ 59.9	$ 178.1	$ 186.2
Geographic Concentration Risk | Gross Written Premiums
Effects of Reinsurance [Line Items]
Concentration percentage (in percent)	100%	100%	100%	100%
Geographic Concentration Risk | Gross Written Premiums | Texas
Effects of Reinsurance [Line Items]
Concentration percentage (in percent)	16.40%	17.40%	15.90%	18.70%
Geographic Concentration Risk | Gross Written Premiums | Georgia
Effects of Reinsurance [Line Items]
Concentration percentage (in percent)	11.70%	10%	11.10%	10.20%
Geographic Concentration Risk | Gross Written Premiums | Colorado
Effects of Reinsurance [Line Items]
Concentration percentage (in percent)	6.80%	6.80%	7.50%	6.40%
Geographic Concentration Risk | Gross Written Premiums | Pennsylvania
Effects of Reinsurance [Line Items]
Concentration percentage (in percent)	5.40%	6%	5.80%	5.60%
Geographic Concentration Risk | Gross Written Premiums | South Carolina
Effects of Reinsurance [Line Items]
Concentration percentage (in percent)	5.30%	3%	5.70%	3.40%
Geographic Concentration Risk | Gross Written Premiums | Utah
Effects of Reinsurance [Line Items]
Concentration percentage (in percent)	3.70%	5.30%	4.50%	5%
Geographic Concentration Risk | Gross Written Premiums | Arizona
Effects of Reinsurance [Line Items]
Concentration percentage (in percent)	4.90%	2.90%	4.30%	2.80%
Geographic Concentration Risk | Gross Written Premiums | Ohio
Effects of Reinsurance [Line Items]
Concentration percentage (in percent)	3.70%	2.60%	3.40%	2.50%
Geographic Concentration Risk | Gross Written Premiums | Oklahoma
Effects of Reinsurance [Line Items]
Concentration percentage (in percent)	3.20%	3.50%	3.30%	3.40%
Geographic Concentration Risk | Gross Written Premiums | Missouri
Effects of Reinsurance [Line Items]
Concentration percentage (in percent)	3.90%	2.90%	3.20%	3%
Geographic Concentration Risk | Gross Written Premiums | All others states
Effects of Reinsurance [Line Items]
Concentration percentage (in percent)	35%	39.60%	35.30%	39%