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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2025
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 goodwill and other intangible assets as of December 31, 2025 and 2024:
$ in Millions |  | Weighted Average Economic Life (in years) |  | December 31, 2025 |  | December 31, 2024
| Acquisition Date Fair Value |  | Accumulated Amortization |  | Impairments (3) |  | 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 (1) |  | N/A |  | — |  |  | — |  |  | — |  |  | — |  |  | 270.4 |  |  | — |  |  |  |  | 270.4 |
Distinguished (2) |  | N/A |  | 396.7 |  |  | — |  |  | — |  |  | 396.7 |  |  | — |  |  | — |  |  |  |  | — |
Other Operations |  | N/A |  | 102.1 |  |  | — |  |  | 9.1 |  |  | 93.0 |  |  | 44.4 |  |  | — |  |  |  |  | 44.4 |
Total goodwill |  |  |  | 623.2 |  |  | — |  |  | 9.1 |  |  | 614.1 |  |  | 439.2 |  |  | — |  |  |  |  | 439.2 |
Other intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ark |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Underwriting capacity |  | N/A |  | 175.7 |  |  | — |  |  | — |  |  | 175.7 |  |  | 175.7 |  |  | — |  |  |  |  | 175.7 |
Kudu |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade names |  | 7.0 |  | 2.2 |  |  | 2.1 |  |  | — |  |  | .1 |  |  | 2.2 |  |  | 1.8 |  |  |  |  | .4 |
Bamboo (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade names |  | N/A |  | — |  |  | — |  |  | — |  |  | — |  |  | 23.5 |  |  | 2.3 |  |  |  |  | 21.2 |
Agency relationships |  | N/A |  | — |  |  | — |  |  | — |  |  | — |  |  | 72.4 |  |  | 12.1 |  |  |  |  | 60.3 |
Developed technology |  | N/A |  | — |  |  | — |  |  | — |  |  | — |  |  | 4.7 |  |  | 1.6 |  |  |  |  | 3.1 |
Other |  | N/A |  | — |  |  | — |  |  | — |  |  | — |  |  | .4 |  |  | .4 |  |  |  |  | — |
Subtotal |  |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 101.0 |  |  | 16.4 |  |  |  |  | 84.6 |
Distinguished (2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade names |  | 10.0 |  | 24.3 |  |  | .8 |  |  | — |  |  | 23.5 |  |  | — |  |  | — |  |  |  |  | — |
Agency relationships |  | 8.0 |  | 127.9 |  |  | 2.0 |  |  | — |  |  | 125.9 |  |  | — |  |  | — |  |  |  |  | — |
Developed technology |  | 5.0 |  | 36.6 |  |  | 5.0 |  |  | — |  |  | 31.6 |  |  | — |  |  | — |  |  |  |  | — |
Subtotal |  |  |  | 188.8 |  |  | 7.8 |  |  | — |  |  | 181.0 |  |  | — |  |  | — |  |  |  |  | — |
Other Operations (2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade names |  | 11.7 |  | 22.4 |  |  | 7.7 |  |  | .2 |  |  | 14.5 |  |  | 13.3 |  |  | 5.6 |  |  |  |  | 7.7 |
Customer relationships |  | 8.8 |  | 53.3 |  |  | 19.4 |  |  | .3 |  |  | 33.6 |  |  | 24.8 |  |  | 13.6 |  |  |  |  | 11.2 |
Other |  | 11.8 |  | 3.1 |  |  | 1.9 |  |  | — |  |  | 1.2 |  |  | 3.1 |  |  | 1.6 |  |  |  |  | 1.5 |
Subtotal | 78.8 |  |  | 29.0 |  |  | .5 |  |  | 49.3 |  |  | 41.2 |  |  | 20.8 |  |  |  |  | 20.4 |
Total other intangible assets | 445.5 |  |  | 38.9 |  |  | .5 |  |  | 406.1 |  |  | 320.1 |  |  | 39.0 |  |  |  |  | 281.1 |
Total goodwill and other intangible assets | $ | 1,068.7 |  |  | $ | 38.9 |  |  | $ | 9.6 |  |  | $ | 1,020.2 |  |  | $ | 759.3 |  |  | $ | 39.0 |  |  |  |  | $ | 720.3 |
(1) Goodwill and other intangible assets associated with Bamboo were disposed of in connection with the Bamboo Sale Transaction. See Note 2 — “Significant Transactions.” (2) The relative fair values of goodwill and other intangible assets recognized in connection with the Distinguished Transaction and the Enterprise Solutions Transaction have not yet been finalized. See Note 2 — “Significant Transactions.” (3) Impairment is related to an Other Operating Business. The following table presents the change in goodwill and other intangible assets for the years ended December 31, 2025 and 2024:
|  | December 31, 2025 |  | December 31, 2024
Millions |  | Goodwill |  | Other Intangible Assets |  | Total Goodwill and Other Intangible Assets |  | Goodwill |  | Other Intangible Assets |  | Total Goodwill and Other Intangible Assets
Beginning balance |  | $ | 439.2 |  |  | $ | 281.1 |  |  | $ | 720.3 |  |  | $ | 168.8 |  |  | $ | 201.8 |  |  | $ | 370.6 |
Acquisitions of businesses (1) |  | 690.8 |  |  | — |  |  | 690.8 |  |  | 270.4 |  |  | 101.0 |  |  | 371.4 |
Acquisitions of intangible assets (2) |  | — |  |  | — |  |  | — |  |  | — |  |  | .3 |  |  | .3 |
Measurement period adjustments (3) |  | 23.1 |  |  | — |  |  | 23.1 |  |  | — |  |  | — |  |  | — |
Attribution of acquisition date fair value estimates between goodwill and other intangible assets (1) | (235.6) |  |  | 235.6 |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization |  | — |  |  | (28.4) |  |  | (28.4) |  |  | — |  |  | (22.0) |  |  | (22.0) |
Impairments (4) |  | (9.1) |  |  | (.5) |  |  | (9.6) |  |  | — |  |  | — |  |  | — |
Dispositions (5) |  | (294.3) |  |  | (81.7) |  |  | (376.0) |  |  | — |  |  | — |  |  | — |
Ending balance |  | $ | 614.1 |  |  | $ | 406.1 |  |  | $ | 1,020.2 |  |  | $ | 439.2 |  |  | $ | 281.1 |  |  | $ | 720.3 |
(1) During 2025, amounts relate to the Distinguished Transaction and the Enterprise Solutions Transaction. The relative fair values of goodwill and other intangible assets recognized in connection with the Distinguished Transaction and the Enterprise Solutions Transaction have not yet been finalized. During 2024, amounts relate to the acquisition of Bamboo. See Note 2 — “Significant Transactions.” (2) Relates to acquisitions 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 the Distinguished Transaction and the Enterprise Solutions Transaction. (4) Impairment is related to an Other Operating Business. (5) Relates to the Bamboo Sale Transaction and the sale of a small, non-core ScaleCo program at Distinguished. See Note 2 — “Significant Transactions.”
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, 2025:
Millions |  | Amortization Expense
2026 |  | $ | 35.5 |
2027 |  | 34.1 |
2028 |  | 33.2 |
2029 |  | 32.8 |
2030 |  | 29.3 |
2031 and years after |  | 65.5 |
Total (1) |  | $ | 230.4 |
(1) Excludes Ark’s indefinite-lived intangible assets of $175.7.

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