Description of Business and Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business and Summary of Significant Accounting Policies	1. Description of Business and Summary of Significant Accounting Policies Description of Business Hippo Holdings Inc., referred to in these Notes to the Consolidated Financial Statements as “Hippo” or the “Company,” specializes in the underwriting, administration, and marketing of personal property and commercial insurance policies. The Company’s subsidiary, Hippo Analytics Inc., is a licensed insurance agency that provides various insurance services, including some or all of the following services for affiliated and non-affiliated insurance carriers: soliciting, marketing, servicing, underwriting, or providing claims processing services for a variety of commercial and personal insurance products. Hippo Analytics Inc. offers its insurance products through licensed insurance agents and direct-to-consumer channels. The Company’s insurance company subsidiaries, Spinnaker Insurance Company (“Spinnaker”), an Illinois domiciled insurance company, Spinnaker Specialty Insurance Company (“SSIC”), a Texas domiciled authorized surplus lines insurance company, and Mainsail Insurance Company (“MIC”), a Texas domiciled insurance company, underwrite personal and commercial insurance products on a direct basis through licensed insurance agents and surplus lines brokers. The Company has a wholly owned Cayman domiciled captive insurance company, RH Solutions Insurance (Cayman) Ltd. (“RHS”), which assumes insurance risk of policies from affiliated and non-affiliated insurance carriers. The Company was incorporated in October 2020 under the name Reinvent Technology Partners Z (“RTPZ”) as a Cayman Islands exempted company for the purpose of effecting a business combination. On August 2, 2021, RTPZ domesticated as a Delaware corporation, changed its name to “Hippo Holdings Inc.” and consummated a series of mergers to acquire Hippo Enterprises Inc., a Delaware corporation (“Old Hippo”), with the Company ultimately surviving (such mergers, the “Business Combination”). The Business Combination was completed pursuant to the Agreement and Plan of Merger, dated as of March 3, 2021, by and among RTPZ, RTPZ Merger Sub Inc. and Old Hippo. Basis of Presentation and Consolidation The interim consolidated financial statements and accompanying notes of the Company have been prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”) and include the Company’s consolidated subsidiaries. All intercompany transactions and balances have been eliminated in consolidation. Certain information and disclosures normally included in consolidated financial statements prepared in accordance with GAAP have been omitted accordingly. The interim financial information is unaudited, but reflects all normal recurring adjustments that are, in the opinion of management, necessary to fairly present the information set forth herein. The interim consolidated financial statements should be read in conjunction with the audited consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2022. Interim results are not necessarily indicative of the results for a full year. In accordance with Accounting Standards Codification 280 “Segment Reporting”, the Company reports three operating segments based on how the Company’s chief operating decision maker assesses the Company’s performance and allocates resources. See Note 17 “Segments”. The Company has three reportable segments: Services, Insurance-as-a-Service, and Hippo Home Insurance Program. Reverse Stock Split On September 29, 2022, the Company filed a Certificate of Amendment to its Certificate of Incorporation to effect a one-for-25 reverse stock split of the Company’s common stock and a corresponding adjustment to its authorized capital stock (the “Reverse Stock Split”), effective as of 11:59 p.m. Eastern Daylight Time on September 29, 2022 (the “Effective Time”). All share and per share information has been retroactively adjusted to give effect to the Reverse Stock Split for all periods presented, unless otherwise indicated. As a result of the Reverse Stock Split, every 25 shares of the Company’s issued and outstanding common stock were automatically converted into one share of issued and outstanding common stock. No fractional shares were issued as a result of the Reverse Stock Split. Stockholders who otherwise would have been entitled to receive fractional shares of common stock were entitled to receive cash in an amount equal to the product obtained by multiplying (a) the closing price per share of the common stock as reported on the New York Stock Exchange as of the first trading day following the Effective Time, by (b) the fraction of one share owned by the stockholder. Proportionate adjustments were made to the number of shares issuable upon the exercise or vesting of all stock options, restricted stock, restricted stock units or other stock-based awards or rights (the “Stock-Based Awards”) and warrants outstanding at the Effective Time, as well as certain performance goals applicable to certain Stock-Based Awards, which resulted in a proportional decrease in the number of shares of the Company’s common stock reserved for issuance upon exercise or vesting of such Stock-Based Awards and warrants, and, in the case of stock options, purchase rights outstanding under the Company’s 2021 Employee Stock Purchase Plan and warrants, a proportional increase in the exercise price of such stock options, purchase rights and warrants. In addition, the number of shares reserved for issuance under the Company’s 2021 Incentive Award Plan and 2021 Employee Stock Purchase Plan were proportionately reduced. Use of Estimates The preparation of the Company’s consolidated financial statements in conformity with GAAP requires management to make estimates that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the consolidated financial statements, and the reported amounts of revenues and expenses during the reporting periods. Significant items subject to such estimates and assumptions include, but are not limited to, loss and loss adjustment expense (“LAE”) reserves, provision for commission slide and cancellations, reinsurance recoverable on paid and unpaid losses and LAE, the fair values of investments, stock-based awards, warrant liabilities, contingent consideration liabilities, acquired intangible assets, deferred tax assets and uncertain tax positions, and revenue recognition. The Company evaluates these estimates on an ongoing basis. These estimates are informed by experience and other assumptions that the Company believes are reasonable under the circumstances. Actual results may differ significantly from these estimates. Recent Accounting Pronouncements The Company has evaluated recent accounting pronouncements through the date the financial statements were issued and filed with the SEC and believes that there are none that will have a material impact on the Company’s consolidated financial statements.