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Unpaid Loss and Loss Adjustment Expense - Claims Development Information, Incurred Losses (Details) $ in Millions | Dec. 31, 2025 USD ($) claim segment | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
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Home and renters |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Total incurred losses and ALAE, net | $ 718.3 |  |  |  |  |  |  |  |  |
IBNR | $ 64.6 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 369,633 |  |  |  |  |  |  |  |  |
Accident amount (less than) | $ 0.1 | $ 0.1 | $ 0.1 | $ 0.1 | $ 0.1 | $ 0.1 | $ 0.1 |  | $ 0.1 | $ 0.1
IBNR, net of reinsurance (less than) | 0.1 |  |  |  | 0.1 | 0.1 | 0.1 |  | 0.1 | 0.1
Pet |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Total incurred losses and ALAE, net | 285.8 |  |  |  |  |  |  |  |  |
IBNR | $ 6.2 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 2,764,894 |  |  |  |  |  |  |  |  |
Car |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Total incurred losses and ALAE, net | $ 491.0 |  |  |  |  |  |  |  |  |
IBNR | $ 40.5 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 346,498 |  |  |  |  |  |  |  |  |
2016 | Home and renters |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Total incurred losses and ALAE, net | $ 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | $ 0.0 | 0.0 | 0.0
IBNR | $ 0.0 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | segment | 8 |  |  |  |  |  |  |  |  |
2016 | Car |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Total incurred losses and ALAE, net | $ 3.3 | 3.3 | 3.4 | 2.0 | 1.8 | 1.7 | 1.7 | 1.7 | 2.0 | $ 1.6
IBNR | $ 0.0 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 1,628 |  |  |  |  |  |  |  |  |
2017 | Home and renters |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Total incurred losses and ALAE, net | $ 1.7 | 1.6 | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 |
IBNR | $ 0.0 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 1,759 |  |  |  |  |  |  |  |  |
2017 | Car |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Total incurred losses and ALAE, net | $ 38.3 | 38.1 | 38.0 | 32.5 | 32.3 | 31.4 | 30.2 | 30.0 | $ 28.6 |
IBNR | $ 0.0 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 29,056 |  |  |  |  |  |  |  |  |
2018 | Home and renters |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Total incurred losses and ALAE, net | $ 13.4 | 13.4 | 13.4 | 13.4 | 13.4 | 13.4 | 13.5 | 15.0 |  |
IBNR | $ 0.0 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 10,534 |  |  |  |  |  |  |  |  |
2018 | Car |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Total incurred losses and ALAE, net | $ 41.8 | 42.1 | 38.6 | 33.9 | 31.8 | 31.9 | 29.7 | $ 31.4 |  |
IBNR | $ 0.0 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 44,104 |  |  |  |  |  |  |  |  |
2019 | Home and renters |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Total incurred losses and ALAE, net | $ 46.2 | 46.2 | 46.1 | 46.3 | 46.3 | 46.1 | 46.0 |  |  |
IBNR | $ 0.0 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 19,512 |  |  |  |  |  |  |  |  |
2019 | Car |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Total incurred losses and ALAE, net | $ 31.3 | 31.6 | 33.2 | 24.6 | 23.2 | 24.9 | $ 24.2 |  |  |
IBNR | $ 0.2 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 51,136 |  |  |  |  |  |  |  |  |
2020 | Home and renters |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Total incurred losses and ALAE, net | $ 52.6 | 52.4 | 52.4 | 51.5 | 51.5 | 53.0 |  |  |  |
IBNR | $ 0.0 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 30,372 |  |  |  |  |  |  |  |  |
2020 | Pet |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Total incurred losses and ALAE, net | $ 0.7 | 0.7 | 0.6 | 1.0 | 0.6 | 0.7 |  |  |  |
IBNR | $ 0.0 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 20,922 |  |  |  |  |  |  |  |  |
2020 | Car |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Total incurred losses and ALAE, net | $ 14.8 | 15.4 | 16.7 | 11.8 | 12.0 | $ 10.8 |  |  |  |
IBNR | $ 0.3 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 37,326 |  |  |  |  |  |  |  |  |
2021 | Home and renters |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Total incurred losses and ALAE, net | $ 58.6 | 58.6 | 58.4 | 55.9 | 59.4 |  |  |  |  |
IBNR | $ 0.2 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 53,560 |  |  |  |  |  |  |  |  |
2021 | Pet |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Total incurred losses and ALAE, net | $ 9.5 | 9.5 | 9.5 | 9.7 | 10.0 |  |  |  |  |
IBNR | $ 0.0 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 197,014 |  |  |  |  |  |  |  |  |
2021 | Car |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Total incurred losses and ALAE, net | $ 82.9 | 84.7 | 86.8 | 75.3 | $ 75.3 |  |  |  |  |
IBNR | $ 0.8 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 43,119 |  |  |  |  |  |  |  |  |
2022 | Home and renters |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Total incurred losses and ALAE, net | $ 94.0 | 93.8 | 92.6 | 96.5 |  |  |  |  |  |
IBNR | $ 1.4 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 56,105 |  |  |  |  |  |  |  |  |
2022 | Pet |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Total incurred losses and ALAE, net | $ 25.1 | 25.2 | 25.3 | 27.4 |  |  |  |  |  |
IBNR | $ 0.0 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 375,674 |  |  |  |  |  |  |  |  |
2022 | Car |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Total incurred losses and ALAE, net | $ 89.5 | 92.3 | 92.0 | $ 83.1 |  |  |  |  |  |
IBNR | $ 3.1 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 46,802 |  |  |  |  |  |  |  |  |
2023 | Home and renters |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Total incurred losses and ALAE, net | $ 133.6 | 136.5 | 143.2 |  |  |  |  |  |  |
IBNR | $ 3.0 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 60,868 |  |  |  |  |  |  |  |  |
2023 | Pet |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Total incurred losses and ALAE, net | $ 49.0 | 48.9 | 51.9 |  |  |  |  |  |  |
IBNR | $ 0.0 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 510,111 |  |  |  |  |  |  |  |  |
2023 | Car |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Total incurred losses and ALAE, net | $ 65.5 | 81.1 | $ 79.1 |  |  |  |  |  |  |
IBNR | $ 3.4 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 39,211 |  |  |  |  |  |  |  |  |
2024 | Home and renters |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Total incurred losses and ALAE, net | $ 138.9 | 154.7 |  |  |  |  |  |  |  |
IBNR | $ 9.0 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 68,389 |  |  |  |  |  |  |  |  |
2024 | Pet |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Total incurred losses and ALAE, net | $ 71.8 | 72.3 |  |  |  |  |  |  |  |
IBNR | $ 0.0 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 697,403 |  |  |  |  |  |  |  |  |
2024 | Car |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Total incurred losses and ALAE, net | $ 60.5 | $ 51.2 |  |  |  |  |  |  |  |
IBNR | $ 8.6 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 28,193 |  |  |  |  |  |  |  |  |
2025 | Home and renters |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Total incurred losses and ALAE, net | $ 179.3 |  |  |  |  |  |  |  |  |
IBNR | $ 51.0 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 68,526 |  |  |  |  |  |  |  |  |
2025 | Pet |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Total incurred losses and ALAE, net | $ 129.7 |  |  |  |  |  |  |  |  |
IBNR | $ 6.2 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 963,770 |  |  |  |  |  |  |  |  |
2025 | Car |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Total incurred losses and ALAE, net | $ 63.1 |  |  |  |  |  |  |  |  |
IBNR | $ 24.1 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Claims | claim | 25,923 |  |  |  |  |  |  |  |  |

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