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Short-Duration Insurance Contracts - Reconciliation of Net Incurred and Paid Claims (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
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Short-Duration Insurance Contracts, Historical Claims Duration [Line Items] |  |  |  |  |  |
Unpaid claims and claim expenses | $ 586.6 |  | $ 564.0 |  |  |
Total short-duration insurance contracts |  |  |  |  |  |
Short-Duration Insurance Contracts, Historical Claims Duration [Line Items] |  |  |  |  |  |
Unpaid claims and claim expenses | 536.4 |  | 510.3 |  |  |
Property & Casualty |  |  |  |  |  |
Short-Duration Insurance Contracts, Historical Claims Duration [Line Items] |  |  |  |  |  |
Unpaid claims and claim expenses | 419.3 |  | 388.7 |  |  |
Group Benefits |  |  |  |  |  |
Short-Duration Insurance Contracts, Historical Claims Duration [Line Items] |  |  |  |  |  |
Unpaid claims and claim expenses | 117.1 | $ 121.9 | 121.6 | $ 123.8 | $ 130.2 | $ 125.4
Other than short-duration |  |  |  |  |  |
Short-Duration Insurance Contracts, Historical Claims Duration [Line Items] |  |  |  |  |  |
Unpaid claims and claim expenses | $ 50.2 |  | $ 53.7 |  |  |

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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (cc) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-3 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-3 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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