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Basis of Presentation and Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Schedule of Deferred Policy Acquisition Costs Asset by Segment | The Company's DAC by reporting segment was as follows:
($ in millions) |  | December 31,
|  | 2024 |  | 2023
Property & Casualty |  | $ | 34.4 |  |  | $ | 29.3 |
Life & Retirement |  | 301.4 |  |  | 297.7 |
Supplemental & Group Benefits |  | 11.4 |  |  | 9.3 |
Total |  | $ | 347.2 |  |  | $ | 336.3 |
Schedule of Property and Equipment | The following amounts are included in Other assets in the Consolidated Balance Sheets:
($ in millions) |  | December 31,
|  | 2024 |  | 2023
Property and equipment |  | $ | 143.1 |  |  | $ | 129.4 |
Less: accumulated depreciation |  | 69.7 |  |  | 60.8 |
Total |  | $ | 73.4 |  |  | $ | 68.6 |
Schedule of FHLB Funding Agreements | As of December 31, 2024, scheduled maturity dates for outstanding FHLB funding agreements were as follows:
($ in millions) |  |  |  |  |  |
|  | Amount |  | Interest Rate |  | Maturity Date
|  | 120.0 |  |  | 4.7 | % |  | December 11, 2026
|  | 25.0 |  |  | 4.6 | % |  | September 09, 2026
|  | 10.0 |  |  | 4.9 | % |  | August 26, 2026
|  | 5.0 |  |  | 4.9 | % |  | August 26, 2026
|  | 10.0 |  |  | 4.8 | % |  | May 20, 2026
|  | 50.0 |  |  | 4.8 | % |  | May 20, 2026
|  | 50.0 |  |  | 4.8 | % |  | February 13, 2026
|  | 10.0 |  |  | 4.8 | % |  | February 13, 2026
|  | 200.0 |  |  | 4.8 | % |  | January 16, 2026
|  | 10.0 |  |  | 4.8 | % |  | November 21, 2025
|  | 125.0 |  |  | 0.6 | % |  | September 11, 2025
|  | 20.0 |  |  | 4.9 | % |  | August 06, 2025
|  | 12.5 |  |  | 0.7 | % |  | June 26, 2025
|  | 20.0 |  |  | 4.9 | % |  | April 23, 2025
|  | 10.0 |  |  | 4.9 | % |  | April 02, 2025
|  | 25.0 |  |  | 4.9 | % |  | April 02, 2025
|  | 30.0 |  |  | 4.9 | % |  | February 28, 2025
|  | 10.0 |  |  | 4.9 | % |  | February 28, 2025
|  | 10.0 |  |  | 0.5 | % |  | February 14, 2025
|  | 40.0 |  |  | 4.9 | % |  | February 07, 2025
|  | 31.0 |  |  | 4.9 | % |  | February 07, 2025
|  | 25.0 |  |  | 4.9 | % |  | January 15, 2025
|  | 60.0 |  |  | 4.9 | % |  | January 10, 2025
|  | 25.0 |  |  | 4.9 | % |  | January 10, 2025
|  | 6.0 |  |  | 4.9 | % |  | January 10, 2025
|  | 50.0 |  |  | 4.9 | % |  | January 10, 2025
Total |  | $ | 989.5 |  |  |  |  |
Schedule of Stock Options Fair Value Pricing Model Weighted-Average Assumptions | The fair value of stock options granted was estimated on the respective dates of grant using the Black-Scholes option pricing model with the weighted average assumptions shown in the following table.
|  | Year Ended December 31,
|  | 2024 |  | 2023 |  | 2022
Number of stock options granted |  | 230,240 |  |  | 209,028 |  |  | 162,224 |
Weighted average grant date fair value of stock options granted |  | $ | 8.12 |  |  | $ | 8.50 |  |  | $ | 8.51 |
Weighted average assumptions: |  |  |  |  |  |
Risk-free interest rate |  | 4.0 | % |  | 4.1 | % |  | 1.9 | %
Expected dividend yield |  | 3.9 | % |  | 3.6 | % |  | 3.2 | %
Expected life, in years |  | 5.6 |  | 5.3 |  | 5.2
Expected volatility (based on historical volatility) |  | 30.7 | % |  | 30.9 | % |  | 30.2 | %
Schedule of Contributions to Qualified Defined Contribution Plan, 401(k), Non-Qualified Defined Contribution Plan and Total Assets of the Plans | For the two qualified plans, all assets are held in their respective plan trusts. The assets and projected benefit obligation at the end of the year are as follows:
($ in millions) |  | Year Ended December 31,
|  | 2024 |  | 2023
401(k) plan assets |  | $ | 265.8 |  |  | $ | 245.7 |
Defined benefit plan assets |  | 13.0 |  |  | 13.9 |
Projected benefit obligation |  | 14.6 |  |  | 16.2 |
Schedule of Computations of Net Income Per Share on both Basic and Diluted Bases, Including Reconciliations of the Numerators and Denominators | The computations of net income (loss) per share on both basic and diluted bases, including reconciliations of the numerators and denominators, were as follows (2022 recast for the adoption of LDTI):
($ in millions) |  | Year Ended December 31,
|  | 2024 |  | 2023 |  | 2022
Basic: |  |  |  |  |  |
Net income for the period |  | $ | 102.8 |  |  | $ | 45.0 |  |  | $ | 19.8 |
Weighted average number of common shares during the period (in millions) |  | 41.3 |  |  | 41.3 |  |  | 41.6 |
Net income per share - basic |  | $ | 2.49 |  |  | $ | 1.09 |  |  | $ | 0.48 |
Diluted: |  |  |  |  |  |
Net income for the period |  | $ | 102.8 |  |  | $ | 45.0 |  |  | $ | 19.8 |
Weighted average number of common shares during the period (in millions) |  | 41.3 |  |  | 41.3 |  |  | 41.6 |
Weighted average number of common equivalent shares to reflect the dilutive effect of common stock equivalent securities (in millions): |  |  |  |  |  |
Stock options |  | — |  |  | — |  |  | — |
CSUs related to deferred compensation for employees |  | — |  |  | — |  |  | — |
RSUs related to incentive compensation |  | 0.2 |  |  | 0.1 |  |  | 0.2 |
Total common and common equivalent shares adjusted to calculate diluted earnings per share (in millions) |  | 41.5 |  |  | 41.4 |  |  | 41.8 |
Net income per share - diluted |  | $ | 2.48 |  |  | $ | 1.09 |  |  | $ | 0.47 |

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