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Subsequent Events - Narrative (Details) - USD ($) $ in Millions |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 10, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Subsequent Event [Line Items] |  |  |  |  |  |
Current year |  | $ 1,239.2 | $ 1,137.1 | $ 1,492.2 | $ 1,651.9 | $ 1,648.2
Subsequent Event | Minimum | Hurricane Milton |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Current year | $ 40.0 |  |  |  |  |
Subsequent Event | Maximum | Hurricane Milton |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Current year | $ 60.0 |  |  |  |  |

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- Definition Amount, after effects of reinsurance, of expense for claims incurred in the current reporting period and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-3 + Details
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