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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of intangible assets and goodwill | The following table presents the economic lives, acquisition date fair values, accumulated amortization and net carrying value for other intangible assets and goodwill as of December 31, 2023 and 2022:
$ in Millions |  | Weighted Average Economic Life (in years) |  | December 31, 2023 |  | December 31, 2022
| Acquisition Date Fair Value |  | Accumulated Amortization |  |  |  | Net Carrying Value |  | Acquisition Date Fair Value |  | Accumulated Amortization |  |  |  | Net Carrying Value
Goodwill: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ark |  | N/A |  | $ | 116.8 |  |  | $ | — |  |  |  |  | $ | 116.8 |  |  | $ | 116.8 |  |  | $ | — |  |  |  |  | $ | 116.8 |
Kudu |  | N/A |  | 7.6 |  |  | — |  |  |  |  | 7.6 |  |  | 7.6 |  |  | — |  |  |  |  | 7.6 |
Other Operations |  | N/A |  | 44.4 |  |  | — |  |  |  |  | 44.4 |  |  | 52.1 |  |  | — |  |  |  |  | 52.1 |
Total goodwill |  |  |  | 168.8 |  |  | — |  |  |  |  | 168.8 |  |  | 176.5 |  |  | — |  |  |  |  | 176.5 |
Other intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ark |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Underwriting capacity |  | N/A |  | 175.7 |  |  | — |  |  |  |  | 175.7 |  |  | 175.7 |  |  | — |  |  |  |  | 175.7 |
Kudu |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade names |  | 7.0 |  | 2.2 |  |  | 1.5 |  |  |  |  | .7 |  |  | 2.2 |  |  | 1.2 |  |  |  |  | 1.0 |
Other Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade names |  | 13.3 |  | 13.3 |  |  | 4.1 |  |  |  |  | 9.2 |  |  | 17.9 |  |  | 3.0 |  |  |  |  | 14.9 |
Customer relationships |  | 10.9 |  | 24.8 |  |  | 10.3 |  |  |  |  | 14.5 |  |  | 29.5 |  |  | 7.5 |  |  |  |  | 22.0 |
Other |  | 12.1 |  | 2.8 |  |  | 1.1 |  |  |  |  | 1.7 |  |  | 2.8 |  |  | .5 |  |  |  |  | 2.3 |
Subtotal | 40.9 |  |  | 15.5 |  |  |  |  | 25.4 |  |  | 50.2 |  |  | 11.0 |  |  |  |  | 39.2 |
Total other intangible assets | 218.8 |  |  | 17.0 |  |  |  |  | 201.8 |  |  | 228.1 |  |  | 12.2 |  |  |  |  | 215.9 |
Total goodwill and other intangible assets | $ | 387.6 |  |  | $ | 17.0 |  |  |  |  | 370.6 |  |  | $ | 404.6 |  |  | 12.2 |  |  |  |  | 392.4 |
The following table presents the change in goodwill and other intangible assets:
|  | December 31, 2023 |  | December 31, 2022
Millions |  | Goodwill |  | Other Intangible Assets |  | Total Goodwill and Other Intangible Assets |  | Goodwill |  | Other Intangible Assets |  | Total Goodwill and Other Intangible Assets
Beginning balance |  | $ | 176.5 |  |  | $ | 215.9 |  |  | $ | 392.4 |  |  | $ | 142.3 |  |  | $ | 198.2 |  |  | $ | 340.5 |
Acquisition of businesses (1) |  | — |  |  | — |  |  | — |  |  | 59.5 |  |  | — |  |  | 59.5 |
Disposition of businesses (2) |  | (6.7) |  |  | (6.9) |  |  | (13.6) |  |  | — |  |  | — |  |  | — |
Attribution of acquisition date fair value estimates between goodwill and other intangible assets |  | — |  |  | — |  |  | — |  |  | (22.9) |  |  | 22.9 |  |  | — |
Measurement period adjustments (3) |  | (1.0) |  |  | — |  |  | (1.0) |  |  | (2.4) |  |  | — |  |  | (2.4) |
Amortization |  | — |  |  | (7.2) |  |  | (7.2) |  |  | — |  |  | (5.2) |  |  | (5.2) |
Ending balance |  | $ | 168.8 |  |  | $ | 201.8 |  |  | $ | 370.6 |  |  | $ | 176.5 |  |  | $ | 215.9 |  |  | $ | 392.4 |
(1) Relates to acquisitions within Other Operations. (2) Relates to a disposition within Other Operations. (3) Measurement period adjustments relate to updated information about acquisition date fair values of assets acquired and liabilities assumed. Adjustments relate to acquisitions within Other Operations.
Schedule of finite-lived intangible assets, future amortization expense | White Mountains expects to recognize amortization expense in each of the next five years as presented in the following table:
Millions |  | Amortization Expense
2024 |  | $ | 5.5 |
2025 |  | 4.8 |
2026 |  | 4.0 |
2027 |  | 3.6 |
2028 and years after |  | 8.2 |
Total (1) |  | $ | 26.1 |
(1) Excludes Ark’s indefinite-lived intangible assets of $175.7.

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