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Loss and Loss Adjustment Expense Reserves - Cumulative Paid Losses and LAE (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | ---
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Ceded unpaid loss and LAE | $ 221.4 | $ 228.8 | $ 216.8 |  |
Gross unpaid loss and LAE | 322.5 | 293.8 | 260.8 |  |
Insurance-as-a-Service |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Total paid losses and LAE, net | 35.0 |  |  |  |
Total unpaid loss and LAE reserves, net | 10.1 |  |  |  |
Unpaid loss and LAE reserves for years prior to 2019, net | 0.3 |  |  |  |
Ceded unpaid loss and LAE | 135.4 |  |  |  |
Gross unpaid loss and LAE | 145.8 |  |  |  |
Hippo Home Insurance Program |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Total paid losses and LAE, net | 222.7 |  |  |  |
Total unpaid loss and LAE reserves, net | 90.7 |  |  |  |
Ceded unpaid loss and LAE | 83.7 |  |  |  |
Gross unpaid loss and LAE | 174.4 |  |  |  |
2019 | Insurance-as-a-Service |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Total paid losses and LAE, net | 4.7 | 4.7 | 4.6 | $ 4.4 | $ 3.2
2019 | Hippo Home Insurance Program |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Total paid losses and LAE, net | 0.0 | 0.0 | 0.0 | 0.0 | $ 0.0
2020 | Insurance-as-a-Service |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Total paid losses and LAE, net | 8.6 | 8.4 | 8.0 | 4.6 |
2020 | Hippo Home Insurance Program |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Total paid losses and LAE, net | 20.2 | 20.1 | 18.8 | $ 12.5 |
2021 | Insurance-as-a-Service |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Total paid losses and LAE, net | 3.1 | 2.8 | 0.4 |  |
2021 | Hippo Home Insurance Program |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Total paid losses and LAE, net | 54.3 | 53.0 | $ 34.9 |  |
2022 | Insurance-as-a-Service |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Total paid losses and LAE, net | 10.7 | 5.0 |  |  |
2022 | Hippo Home Insurance Program |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Total paid losses and LAE, net | 43.5 | $ 33.3 |  |  |
2023 | Insurance-as-a-Service |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Total paid losses and LAE, net | 7.9 |  |  |  |
2023 | Hippo Home Insurance Program |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Total paid losses and LAE, net | $ 104.7 |  |  |  |

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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (cc) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-3 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-3 + Details
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