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Loss and Loss Adjustment Expense Reserves (Tables) | 6 Months Ended
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Jun. 30, 2024
Loss and Loss Adjustment Expenses Reserves [Abstract] |
Schedule of Liability for Unpaid Claims and Claims Adjustment Expense | Activity in the loss and loss adjustment expense reserves is summarized as follows:
| June 30,
(millions) | 2024 |  | 2023
Balance at January 1 | $ | 34,389.2 |  |  | $ | 30,359.3 |
Less reinsurance recoverables on unpaid losses | 4,789.0 |  |  | 5,559.2 |
Net balance at January 1 | 29,600.2 |  |  | 24,800.1 |
Incurred related to: |  |  |
Current year | 23,629.4 |  |  | 21,683.6 |
Prior years | (62.5) |  |  | 1,110.5 |
Total incurred | 23,566.9 |  |  | 22,794.1 |
Paid related to: |  |  |
Current year | 11,470.3 |  |  | 10,789.5 |
Prior years | 9,606.6 |  |  | 9,115.8 |
Total paid | 21,076.9 |  |  | 19,905.3 |
Net balance at June 30 | 32,090.2 |  |  | 27,688.9 |
Plus reinsurance recoverables on unpaid losses | 4,515.0 |  |  | 5,064.4 |
Balance at June 30 | $ | 36,605.2 |  |  | $ | 32,753.3 |

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- Definition Loss and Loss Adjustment Expenses Reserves [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of the activity in the reserve for settling insured claims and expenses incurred in the claims settlement process for the period. The estimated liability includes the amount of money that will be required for future payments of (a) claims that have been reported to the insurer, (b) claims related to insured events that have occurred but that have not been reported to the insurer as of the date the liability is estimated, and (c) claim adjustment expenses. Claim adjustment expenses include costs incurred in the claim settlement process such as legal fees; outside adjuster fees; and costs to record, process, and adjust claims. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-3 + Details
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