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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The changes in the carrying amount of goodwill by reporting segment for the year ended December 31, 2023 were as follows:
($ in millions) |  | Property & Casualty |  | Life & Retirement |  | Supplemental & Group Benefits |  | Total
Balance as of January 1, 2021 |  |  |  |  |  |  |  |
Goodwill |  | $ | 9.5 |  |  | $ | 48.0 |  |  | $ | 19.6 |  |  | $ | 77.1 |
Accumulated impairment losses |  | — |  |  | (33.6) |  |  | — |  |  | (33.6) |
Total goodwill, net |  | 9.5 |  |  | 14.4 |  |  | 19.6 |  |  | 43.5 |
Acquisitions |  | — |  |  | — |  |  | — |  |  | — |
Impairments |  | — |  |  | — |  |  | — |  |  | — |
Balance as of December 31, 2021 |  |  |  |  |  |  |  |
Goodwill |  | 9.5 |  |  | 48.0 |  |  | 19.6 |  |  | 77.1 |
Accumulated impairment losses |  | — |  |  | (33.6) |  |  | — |  |  | (33.6) |
Total goodwill, net |  | 9.5 |  |  | 14.4 |  |  | 19.6 |  |  | 43.5 |
Acquisitions |  | — |  |  | — |  |  | 12.8 |  |  | 12.8 |
Impairments |  | — |  |  | (2.0) |  |  | — |  |  | (2.0) |
Balance as of December 31, 2022 |  |  |  |  |  |  |  |
Goodwill |  | 9.5 |  |  | 48.0 |  |  | 32.4 |  |  | 89.9 |
Accumulated impairment losses |  | — |  |  | (35.6) |  |  | — |  |  | (35.6) |
Total goodwill, net |  | 9.5 |  |  | 12.4 |  |  | 32.4 |  |  | 54.3 |
Acquisitions |  | — |  |  | — |  |  | — |  |  | — |
Impairments |  | — |  |  | — |  |  | — |  |  | — |
Balance as of December 31, 2023 |  |  |  |  |  |  |  |
Goodwill |  | 9.5 |  |  | 48.0 |  |  | 32.4 |  |  | 89.9 |
Accumulated impairment losses |  | — |  |  | (35.6) |  |  | — |  |  | (35.6) |
Total goodwill, net |  | $ | 9.5 |  |  | $ | 12.4 |  |  | $ | 32.4 |  |  | $ | 54.3 |
Summary of Finite-Lived Intangible Assets | As of December 31, 2023 the outstanding amounts of definite-lived intangible assets subject to amortization were as follows:
($ in millions) |  | Weighted Average |  |
|  | Useful Life (in Years) |  |
At inception: |  |  |  |
Value of business acquired |  | 28 |  | $ | 100.1 |
Value of distribution acquired |  | 17 |  | 54.0 |
Value of agency relationships |  | 14 |  | 17.0 |
Value of customer relationships |  | 10 |  | 59.9 |
Total |  | 20 |  | 231.0 |
Accumulated amortization and impairments: |  |  |  |
Value of business acquired |  |  |  | (35.3) |
Value of distribution acquired |  |  |  | (17.5) |
Value of agency relationships |  |  |  | (9.8) |
Value of customer relationships |  |  |  | (11.5) |
Total |  |  |  | (74.1) |
Net intangible assets subject to amortization: |  |  |  | $ | 156.9 |
Future Amortization Expense | Estimated future amortization of the Company's definite-lived intangible assets were as follows:
($ in millions) |  |
Year Ending December 31, |  |
2024 |  | $ | 14.5 |
2025 |  | 14.3 |
2026 |  | 14.2 |
2027 |  | 14.1 |
2028 |  | 14.1 |
Thereafter |  | 85.7 |
Total |  | $ | 156.9 |
Summary of Indefinite-Lived Intangible Assets | Indefinite-lived intangible assets (not subject to amortization) as of December 31, 2023 were as follows:
($ in millions) |  | Trade Names |  | State Licenses |  | Total
Balance as of January 1, 2021 |  | $ | 7.9 |  |  | $ | 2.9 |  |  | $ | 10.8 |
Impairments |  | — |  |  | — |  |  | — |
Acquisitions |  | — |  |  | — |  |  | — |
Balance as of December 31, 2021 |  | 7.9 |  |  | 2.9 |  |  | 10.8 |
Impairments |  | (0.3) |  |  | — |  |  | (0.3) |
Acquisitions |  | — |  |  | 2.9 |  |  | 2.9 |
Balance as of December 31, 2022 |  | 7.6 |  |  | 5.8 |  |  | 13.4 |
Impairments |  | — |  |  | — |  |  | — |
Acquisitions |  | — |  |  | — |  |  | — |
Balance as of December 31, 2023 |  | $ | 7.6 |  |  | $ | 5.8 |  |  | $ | 13.4 |

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