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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | Goodwill balances by business segment at December 31, 2024 and 2023 were:
DOLLARS IN MILLIONS |  | 2024 |  | 2023
Specialty Property & Casualty Insurance |  | $ | 1,043.0 |  |  | $ | 1,043.0 |
Life Insurance |  | 207.7 |  |  | 207.7 |
Total |  | $ | 1,250.7 |  |  | $ | 1,250.7 |
Schedule of Definite-Life Intangible Assets | The gross carrying amount and accumulated amortization of definite and indefinite life intangible assets at December 31, 2024 and 2023 were:
|  | 2024 |  | 2023
(Dollars in Millions) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Amount
Definite Life Intangible Assets: |  |  |  |  |  |  |  |  |  |  |  |
Value of Business Acquired |  | $ | 237.5 |  |  | $ | 225.4 |  |  | $ | 12.1 |  |  | $ | 237.5 |  |  | $ | 223.7 |  |  | $ | 13.8 |
Customer Relationships |  | 43.8 |  |  | 42.3 |  |  | 1.5 |  |  | 43.8 |  |  | 42.1 |  |  | 1.7 |
Agent Relationships |  | 81.6 |  |  | 43.9 |  |  | 37.7 |  |  | 81.6 |  |  | 38.2 |  |  | 43.4 |
Trade Names |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Internal-Use Software |  | 395.1 |  |  | 180.3 |  |  | 214.8 |  |  | 388.0 |  |  | 178.0 |  |  | 210.0 |
Total Definite Life Intangible Assets |  | 758.0 |  |  | 491.9 |  |  | 266.1 |  |  | 750.9 |  |  | 482.0 |  |  | 268.9 |
Indefinite Life Intangible Assets: |  |  |  |  |  |  |  |  |  |  |  |
Trade Names |  | 5.2 |  |  | — |  |  | 5.2 |  |  | 5.2 |  |  | — |  |  | 5.2 |
Insurance Licenses |  | 44.2 |  |  | — |  |  | 44.2 |  |  | 44.2 |  |  | — |  |  | 44.2 |
Total Indefinite Life Intangible Assets |  | 49.4 |  |  | — |  |  | 49.4 |  |  | 49.4 |  |  | — |  |  | 49.4 |
Total Intangible Assets |  | $ | 807.4 |  |  | $ | 491.9 |  |  | $ | 315.5 |  |  | $ | 800.3 |  |  | $ | 482.0 |  |  | $ | 318.3 |
Schedule of Indefinite-Life Intangible Assets | The gross carrying amount and accumulated amortization of definite and indefinite life intangible assets at December 31, 2024 and 2023 were:
|  | 2024 |  | 2023
(Dollars in Millions) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Amount
Definite Life Intangible Assets: |  |  |  |  |  |  |  |  |  |  |  |
Value of Business Acquired |  | $ | 237.5 |  |  | $ | 225.4 |  |  | $ | 12.1 |  |  | $ | 237.5 |  |  | $ | 223.7 |  |  | $ | 13.8 |
Customer Relationships |  | 43.8 |  |  | 42.3 |  |  | 1.5 |  |  | 43.8 |  |  | 42.1 |  |  | 1.7 |
Agent Relationships |  | 81.6 |  |  | 43.9 |  |  | 37.7 |  |  | 81.6 |  |  | 38.2 |  |  | 43.4 |
Trade Names |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Internal-Use Software |  | 395.1 |  |  | 180.3 |  |  | 214.8 |  |  | 388.0 |  |  | 178.0 |  |  | 210.0 |
Total Definite Life Intangible Assets |  | 758.0 |  |  | 491.9 |  |  | 266.1 |  |  | 750.9 |  |  | 482.0 |  |  | 268.9 |
Indefinite Life Intangible Assets: |  |  |  |  |  |  |  |  |  |  |  |
Trade Names |  | 5.2 |  |  | — |  |  | 5.2 |  |  | 5.2 |  |  | — |  |  | 5.2 |
Insurance Licenses |  | 44.2 |  |  | — |  |  | 44.2 |  |  | 44.2 |  |  | — |  |  | 44.2 |
Total Indefinite Life Intangible Assets |  | 49.4 |  |  | — |  |  | 49.4 |  |  | 49.4 |  |  | — |  |  | 49.4 |
Total Intangible Assets |  | $ | 807.4 |  |  | $ | 491.9 |  |  | $ | 315.5 |  |  | $ | 800.3 |  |  | $ | 482.0 |  |  | $ | 318.3 |
Finite-Lived Intangible Assets Amortization Expense | In 2024, 2023 and 2022, the Company recognized the following amortization expense on definite life intangible assets:
DOLLARS IN MILLIONS |  | 2024 |  | 2023 |  | 2022
Specialty Property & Casualty Insurance |  | $ | 16.6 |  |  | $ | 17.9 |  |  | $ | 21.6 |
Life Insurance |  | 6.0 |  |  | 3.4 |  |  | 3.8 |
Total Segment Amortization Expense |  | 22.6 |  |  | 21.3 |  |  | 25.4 |
Corporate and Other |  | 21.8 |  |  | 26.1 |  |  | 26.7 |
Non-Core Operations |  | 1.9 |  |  | 1.2 |  |  | 1.6 |
Total Amortization Expense |  | $ | 46.3 |  |  | $ | 48.6 |  |  | $ | 53.7 |
Schedule of Definite-Life Intangible Assets, Future Amortization Expense | The amount of amortization expense expected to be recorded in the next five years for definite life intangible assets is as follows:
DOLLARS IN MILLIONS |  | 2025 |  | 2026 |  | 2027 |  | 2028 |  | 2029 |  |  |  |
Definite Life Intangible Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of Business Acquired |  | $ | 1.6 |  |  | $ | 1.5 |  |  | $ | 1.5 |  |  | $ | 1.4 |  |  | $ | 1.3 |  |  |  |  |
Customer Relationships |  | 0.4 |  |  | 0.4 |  |  | 0.3 |  |  | 0.2 |  |  | 0.2 |  |  |  |  |
Agent Relationships |  | 8.6 |  |  | 8.6 |  |  | 4.9 |  |  | 4.9 |  |  | 4.9 |  |  |  |  |
Internal-Use Software |  | 35.5 |  |  | 30.9 |  |  | 25.3 |  |  | 22.1 |  |  | 14.7 |  |  |  |  |
Total |  | $ | 46.1 |  |  | $ | 41.4 |  |  | $ | 32.0 |  |  | $ | 28.6 |  |  | $ | 21.1 |  |  |  |  |

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