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Reserve for Known and Incurred but Not Reported Claims - Summary of Incurred and Paid Claims Development Net of Reinsurance (Detail) Claim in Millions, $ in Millions | Dec. 31, 2023 USD ($) Claim | Dec. 31, 2022 USD ($) | [1] | Dec. 31, 2021 USD ($) | [1] | Dec. 31, 2020 USD ($) | [1] | Dec. 31, 2019 USD ($) | [1] | Dec. 31, 2018 USD ($) | [1] | Dec. 31, 2017 USD ($) | [1] | Dec. 31, 2016 USD ($) | [1] | Dec. 31, 2015 USD ($) | [1] | Dec. 31, 2014 USD ($) | [1]
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Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred claims and allocated claim adjustment expenses | $ 1,781.9 |  |  |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expenses | 1,766.2 |  |  |  |  |  |  |  |  |
All outstanding liabilities before 2014 | 0.0 |  |  |  |  |  |  |  |  |
Liabilities for claims and claims adjustment expenses | 40.4 |  |  |  |  |  |  |  |  |
Home warranty |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Liabilities for claims and claims adjustment expenses | 15.7 |  |  |  |  |  |  |  |  |
Accident Year 2014 [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred claims and allocated claim adjustment expenses | $ 123.8 | $ 123.8 | $ 123.8 | $ 123.8 | $ 123.8 | $ 123.8 | $ 123.8 | $ 123.8 | $ 123.8 | $ 123.8
Cumulative number of reported claims | Claim | 0.8 |  |  |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expenses | $ 123.8 | 123.8 | 123.8 | 123.8 | 123.8 | 123.8 | 123.8 | 123.8 | 123.8 | $ 111.2
Accident Year 2015 [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred claims and allocated claim adjustment expenses | $ 143.7 | 143.7 | 143.7 | 143.7 | 143.7 | 143.7 | 143.7 | 143.7 | 143.7 |
Cumulative number of reported claims | Claim | 0.9 |  |  |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expenses | $ 143.7 | 143.7 | 143.7 | 143.7 | 143.7 | 143.7 | 143.7 | 143.7 | $ 129.5 |
Accident Year 2016 [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred claims and allocated claim adjustment expenses | $ 172.7 | 172.7 | 172.7 | 172.7 | 172.7 | 172.7 | 172.7 | 172.7 |  |
Cumulative number of reported claims | Claim | 1.0 |  |  |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expenses | $ 172.7 | 172.7 | 172.7 | 172.7 | 172.7 | 172.7 | 172.7 | $ 155.4 |  |
Accident Year 2017 [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred claims and allocated claim adjustment expenses | $ 167.2 | 167.2 | 167.2 | 167.2 | 167.2 | 167.2 | 167.2 |  |  |
Cumulative number of reported claims | Claim | 1.0 |  |  |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expenses | $ 167.2 | 167.2 | 167.2 | 167.2 | 167.2 | 167.2 | $ 151.1 |  |  |
Accident Year 2018 [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred claims and allocated claim adjustment expenses | $ 179.8 | 179.8 | 179.8 | 179.8 | 179.8 | 179.8 |  |  |  |
Cumulative number of reported claims | Claim | 1.1 |  |  |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expenses | $ 179.8 | 179.8 | 179.8 | 179.8 | 179.8 | $ 163.0 |  |  |  |
Accident Year 2019 [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred claims and allocated claim adjustment expenses | $ 174.1 | 174.1 | 174.1 | 174.1 | 174.1 |  |  |  |  |
Cumulative number of reported claims | Claim | 1.1 |  |  |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expenses | $ 174.1 | 174.1 | 174.1 | 174.1 | $ 159.2 |  |  |  |  |
Accident Year 2020 [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred claims and allocated claim adjustment expenses | $ 197.4 | 197.4 | 197.4 | 197.4 |  |  |  |  |  |
Cumulative number of reported claims | Claim | 1.2 |  |  |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expenses | $ 197.4 | 197.4 | 197.4 | $ 177.8 |  |  |  |  |  |
Accident Year 2021 [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred claims and allocated claim adjustment expenses | $ 218.2 | 218.2 | 218.2 |  |  |  |  |  |  |
Cumulative number of reported claims | Claim | 1.2 |  |  |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expenses | $ 218.2 | 218.2 | $ 198.7 |  |  |  |  |  |  |
Accident Year 2022 [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred claims and allocated claim adjustment expenses | $ 211.8 | 211.8 |  |  |  |  |  |  |  |
Cumulative number of reported claims | Claim | 1.1 |  |  |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expenses | $ 211.8 | $ 192.3 |  |  |  |  |  |  |  |
Accident Year 2023 [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred claims and allocated claim adjustment expenses | $ 193.2 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | Claim | 1.0 |  |  |  |  |  |  |  |  |
Cumulative paid claims and allocated claim adjustment expenses | $ 177.5 |  |  |  |  |  |  |  |  |
[1] | Amounts unaudited.

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