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Goodwill and Other Intangible Assets | 3 Months Ended
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Mar. 31, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Other Intangible Assets | Goodwill and Other Intangible Assets White Mountains accounts for business combinations using the acquisition method. Under the acquisition method, White Mountains recognizes and measures the assets acquired, including other intangible assets, and liabilities assumed, including contingent consideration liabilities, at their estimated fair values as of the acquisition date. Goodwill represents the excess of the amount paid to acquire a business over the fair value of identifiable net assets at the acquisition date. The estimated acquisition date fair values, generally consisting of intangible assets and contingent consideration liabilities, may be recorded at provisional amounts in circumstances where the information necessary to complete the acquisition accounting is not available at the reporting date. Any such provisional amounts are finalized as measurement period adjustments within one year of the acquisition date. 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 March 31, 2025 and December 31, 2024:
$ in Millions |  | Weighted Average Economic Life (in years) |  | March 31, 2025 |  | December 31, 2024
| 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 |  |  | 270.4 |  |  | — |  |  |  |  | 270.4 |
Other Operations |  | N/A |  | 44.4 |  |  | — |  |  | 44.4 |  |  | 44.4 |  |  | — |  |  |  |  | 44.4 |
Total goodwill |  | 439.2 |  |  | — |  |  | 439.2 |  |  | 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 |  |  | 1.9 |  |  | .3 |  |  | 2.2 |  |  | 1.8 |  |  |  |  | .4 |
Bamboo |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade names |  | 10.0 |  | 23.5 |  |  | 2.9 |  |  | 20.6 |  |  | 23.5 |  |  | 2.3 |  |  |  |  | 21.2 |
Agency relationships |  | 6.0 |  | 72.4 |  |  | 15.1 |  |  | 57.3 |  |  | 72.4 |  |  | 12.1 |  |  |  |  | 60.3 |
Developed technology |  | 3.0 |  | 4.7 |  |  | 2.0 |  |  | 2.7 |  |  | 4.7 |  |  | 1.6 |  |  |  |  | 3.1 |
Other |  | 0.3 |  | .4 |  |  | .4 |  |  | — |  |  | .4 |  |  | .4 |  |  |  |  | — |
Subtotal |  |  |  | 101.0 |  | 20.4 |  | 80.6 |  | 101.0 |  |  | 16.4 |  |  |  |  | 84.6 |
Other Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade names |  | 13.3 |  | 13.3 |  |  | 6.0 |  |  | 7.3 |  |  | 13.3 |  |  | 5.6 |  |  |  |  | 7.7 |
Customer relationships |  | 11.0 |  | 24.8 |  |  | 14.3 |  |  | 10.5 |  |  | 24.8 |  |  | 13.6 |  |  |  |  | 11.2 |
Other |  | 11.8 |  | 3.1 |  |  | 1.6 |  |  | 1.5 |  |  | 3.1 |  |  | 1.6 |  |  |  |  | 1.5 |
Subtotal |  |  |  | 41.2 |  |  | 21.9 |  |  | 19.3 |  |  | 41.2 |  |  | 20.8 |  |  |  |  | 20.4 |
Total other intangible assets | 320.1 |  |  | 44.2 |  |  | 275.9 |  |  | 320.1 |  |  | 39.0 |  |  |  |  | 281.1 |
Total goodwill and other intangible assets | $ | 759.3 |  |  | $ | 44.2 |  |  | $ | 715.1 |  |  | $ | 759.3 |  |  | $ | 39.0 |  |  |  |  | $ | 720.3 |
Rollforward of Goodwill and Other Intangible Assets The following table presents the change in goodwill and other intangible assets for the three months ended March 31, 2025 and 2024:
|  | Three Months Ended March 31,
|  | 2025 |  | 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) |  | — |  |  | — |  |  | — |  |  | 270.4 |  |  | 101.0 |  |  | 371.4 |
Acquisitions of intangible assets (2) |  | — |  |  | — |  |  | — |  |  | — |  |  | .3 |  |  | .3 |
Amortization |  | — |  |  | (5.2) |  |  | (5.2) |  |  | — |  |  | (5.7) |  |  | (5.7) |
Ending balance |  | $ | 439.2 |  |  | $ | 275.9 |  |  | $ | 715.1 |  |  | $ | 439.2 |  |  | $ | 297.4 |  |  | $ | 736.6 |
(1) Relates to the Bamboo Transaction. See Note 2 — “Significant Transactions.” (2) Relates to acquisitions within Other Operations. During the three months ended March 31, 2025 and 2024, White Mountains did not recognize any impairments to goodwill and other intangible assets.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-30/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-20/tableOfContent + Details
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