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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of intangible assets and goodwill | The following table presents the economic life, acquisition date fair value, accumulated amortization and net carrying value for other intangible assets and goodwill as of December 31, 2024 and 2023:
$ in Millions |  | Weighted Average Economic Life (in years) |  | December 31, 2024 |  | December 31, 2023
| 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 |
Bamboo |  | N/A |  | 270.4 |  |  | — |  |  |  |  | 270.4 |  |  | — |  |  | — |  |  |  |  | — |
Other Operations |  | N/A |  | 44.4 |  |  | — |  |  |  |  | 44.4 |  |  | 44.4 |  |  | — |  |  |  |  | 44.4 |
Total goodwill |  |  |  | 439.2 |  |  | — |  |  |  |  | 439.2 |  |  | 168.8 |  |  | — |  |  |  |  | 168.8 |
Other intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ark |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Underwriting capacity |  | N/A |  | 175.7 |  |  | — |  |  |  |  | 175.7 |  |  | 175.7 |  |  | — |  |  |  |  | 175.7 |
Kudu |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade names |  | 7.0 |  | 2.2 |  |  | 1.8 |  |  |  |  | .4 |  |  | 2.2 |  |  | 1.5 |  |  |  |  | .7 |
Bamboo |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade names |  | 10.0 |  | 23.5 |  |  | 2.3 |  |  |  |  | 21.2 |  |  | — |  |  | — |  |  |  |  | — |
Agency relationships |  | 6.0 |  | 72.4 |  |  | 12.1 |  |  |  |  | 60.3 |  |  | — |  |  | — |  |  |  |  | — |
Developed technology |  | 3.0 |  | 4.7 |  |  | 1.6 |  |  |  |  | 3.1 |  |  | — |  |  | — |  |  |  |  | — |
Other |  | 0.3 |  | .4 |  |  | .4 |  |  |  |  | — |  |  | — |  |  | — |  |  |  |  | — |
Subtotal |  |  |  | 101.0 |  |  | 16.4 |  |  |  |  | 84.6 |  |  | — |  |  | — |  |  |  |  | — |
Other Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade names |  | 13.3 |  | 13.3 |  |  | 5.6 |  |  |  |  | 7.7 |  |  | 13.3 |  |  | 4.1 |  |  |  |  | 9.2 |
Customer relationships |  | 11.0 |  | 24.8 |  |  | 13.6 |  |  |  |  | 11.2 |  |  | 24.8 |  |  | 10.3 |  |  |  |  | 14.5 |
Other |  | 11.8 |  | 3.1 |  |  | 1.6 |  |  |  |  | 1.5 |  |  | 2.8 |  |  | 1.1 |  |  |  |  | 1.7 |
Subtotal | 41.2 |  |  | 20.8 |  |  |  |  | 20.4 |  |  | 40.9 |  |  | 15.5 |  |  |  |  | 25.4 |
Total other intangible assets | 320.1 |  |  | 39.0 |  |  |  |  | 281.1 |  |  | 218.8 |  |  | 17.0 |  |  |  |  | 201.8 |
Total goodwill and other intangible assets | $ | 759.3 |  |  | $ | 39.0 |  |  |  |  | $ | 720.3 |  |  | $ | 387.6 |  |  | $ | 17.0 |  |  |  |  | $ | 370.6 |
The following table presents the change in goodwill and other intangible assets for the years ended December 31, 2024 and 2023:
|  | December 31, 2024 |  | December 31, 2023
Millions |  | Goodwill |  | Other Intangible Assets |  | Total Goodwill and Other Intangible Assets |  | Goodwill |  | Other Intangible Assets |  | Total Goodwill and Other Intangible Assets
Beginning balance |  | $ | 168.8 |  |  | $ | 201.8 |  |  | $ | 370.6 |  |  | $ | 176.5 |  |  | $ | 215.9 |  |  | $ | 392.4 |
Acquisitions of businesses (1) |  | 270.4 |  |  | 101.0 |  |  | 371.4 |  |  | — |  |  | — |  |  | — |
Acquisitions of intangible assets (2) |  | — |  |  | .3 |  |  | .3 |  |  | — |  |  | — |  |  | — |
Dispositions (2) |  | — |  |  | — |  |  | — |  |  | (6.7) |  |  | (6.9) |  |  | (13.6) |
Measurement period adjustments (3) |  | — |  |  | — |  |  | — |  |  | (1.0) |  |  | — |  |  | (1.0) |
Amortization |  | — |  |  | (22.0) |  |  | (22.0) |  |  | — |  |  | (7.2) |  |  | (7.2) |
Ending balance |  | $ | 439.2 |  |  | $ | 281.1 |  |  | $ | 720.3 |  |  | $ | 168.8 |  |  | $ | 201.8 |  |  | $ | 370.6 |
(1) Relates to the Bamboo Transaction. See Note 2 — “Significant Transactions.” (2) Relates to acquisitions and dispositions 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 of certain consolidated Other Operating Businesses.
Schedule of finite-lived intangible assets, future amortization expense | The following table presents a schedule of White Mountains’s future amortization expense as of December 31, 2024:
Millions |  | Amortization Expense
2025 |  | $ | 20.8 |
2026 |  | 20.1 |
2027 |  | 17.9 |
2028 |  | 16.9 |
2029 |  | 16.4 |
2030 and years after |  | 13.3 |
Total (1) |  | $ | 105.4 |
(1) Excludes Ark’s indefinite-lived intangible assets of $175.7.

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