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Amortization of Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Finite-Lived Intangible Assets Amortization Expense | The following table presents the amortization expense on definite life intangible assets incurred by the Company for the three and nine months ended September 30, 2025 and 2024:
|  | Three Months Ended |  | Nine Months Ended
(Dollars in Millions) |  | Sep 30, 2025 |  | Sep 30, 2024 |  | Sep 30, 2025 |  | Sep 30, 2024
Specialty Property & Casualty Insurance |  | $ | 5.5 |  |  | $ | 4.0 |  |  | $ | 14.3 |  |  | $ | 12.6 |
Life Insurance |  | 1.8 |  |  | 1.6 |  |  | 5.1 |  |  | 4.2 |
Total Segment Amortization Expense |  | 7.3 |  |  | 5.6 |  |  | 19.4 |  |  | 16.8 |
Corporate and Other |  | 4.2 |  |  | 5.3 |  |  | 14.0 |  |  | 16.8 |
Non-Core Operations 1 |  | 22.3 |  |  | 0.5 |  |  | 23.6 |  |  | 1.2 |
Total Amortization Expense |  | $ | 33.8 |  |  | $ | 11.4 |  |  | $ | 57.0 |  |  | $ | 34.8 |
1 During the three and nine months ended September 30, 2025, the Company recognized a $21.7 million impairment of Internal-Use Software assets included in Non-Core Operations.

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- Definition Tabular disclosure of amortization expense of assets, excluding financial assets, that lack physical substance, having a limited useful life. + References No definition available. + Details
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