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Retirement Plans (Tables) | 3 Months Ended
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Mar. 31, 2025
Retirement Benefits [Abstract] |
Schedule of Components of Net Periodic Benefit Cost | The following tables provide information about the Pension Plan:
|  | Pension Plan
|  | Quarter ended March 31, |  |
($ in thousands) |  | 2025 |  | 2024 |  |  |  |
Net Periodic Pension Cost (Benefit): |  |  |  |  |  |  |  |
Interest cost |  | $ | 3,973 |  |  | 3,888 |  |  |  |  |
Expected return on plan assets |  | (5,339) |  |  | (5,382) |  |  |  |  |
Amortization of unrecognized net actuarial loss |  | 868 |  |  | 955 |  |  |  |  |
Total net periodic pension cost (benefit)1 |  | $ | (498) |  |  | (539) |  |  |  |  |
1 The components of net periodic pension cost (benefit) are included within "Loss and loss expense incurred" and "Other insurance expenses" on the Consolidated Statements of Income.
Schedule of Weighted-Average Expense Assumptions |
|  | Pension Plan
|  | Quarter ended March 31,
|  | 2025 |  | 2024
Weighted-Average Expense Assumptions: |  |  |  |
Discount rate |  | 5.69 | % |  | 5.02 | %
Effective interest rate for calculation of interest cost |  | 5.42 |  |  | 4.91 |
Expected return on plan assets |  | 6.60 |  |  | 6.40 |

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- Definition Tabular disclosure of assumption used to determine benefit obligation and net periodic benefit cost of defined benefit plan. Includes, but is not limited to, discount rate, rate of compensation increase, expected long-term rate of return on plan assets and interest crediting rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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