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Short-Duration Insurance Contracts - Schedule of Net Incurred and Paid Claims (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
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Short-Duration Insurance Contracts, Historical Claims Duration [Line Items] |  |  |  |  |  |
Unpaid claims and claim expenses | $ 597.0 |  | $ 581.7 |  |  |
Total short-duration insurance contracts |  |  |  |  |  |
Short-Duration Insurance Contracts, Historical Claims Duration [Line Items] |  |  |  |  |  |
Unpaid claims and claim expenses | 548.6 |  | 533.4 |  |  |
Property & Casualty |  |  |  |  |  |
Short-Duration Insurance Contracts, Historical Claims Duration [Line Items] |  |  |  |  |  |
Unpaid claims and claim expenses | 433.4 |  | 416.8 |  |  |
Group Benefits |  |  |  |  |  |
Short-Duration Insurance Contracts, Historical Claims Duration [Line Items] |  |  |  |  |  |
Unpaid claims and claim expenses | 115.2 | $ 116.1 | 116.6 | $ 117.1 | $ 121.9 | $ 121.6
Other than short-duration |  |  |  |  |  |
Short-Duration Insurance Contracts, Historical Claims Duration [Line Items] |  |  |  |  |  |
Unpaid claims and claim expenses | $ 48.4 |  | $ 48.3 |  |  |

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