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Short-Duration Insurance Contracts - Reconciliation of Net Incurred and Paid Claims (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
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Short-Duration Insurance Contracts, Historical Claims Duration [Line Items] |  |  |  |  |  |
Unpaid claims and claim expenses | $ 596.6 |  | $ 581.7 |  |  |
Total short-duration insurance contracts |  |  |  |  |  |
Short-Duration Insurance Contracts, Historical Claims Duration [Line Items] |  |  |  |  |  |
Unpaid claims and claim expenses | 549.0 |  | 533.4 |  |  |
Property & Casualty |  |  |  |  |  |
Short-Duration Insurance Contracts, Historical Claims Duration [Line Items] |  |  |  |  |  |
Unpaid claims and claim expenses | 432.9 |  | 416.8 |  |  |
Group Benefits |  |  |  |  |  |
Short-Duration Insurance Contracts, Historical Claims Duration [Line Items] |  |  |  |  |  |
Unpaid claims and claim expenses | 116.1 | $ 114.3 | 116.6 | $ 121.9 | $ 120.3 | $ 121.6
Other than short-duration |  |  |  |  |  |
Short-Duration Insurance Contracts, Historical Claims Duration [Line Items] |  |  |  |  |  |
Unpaid claims and claim expenses | $ 47.6 |  | $ 48.3 |  |  |

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