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Goodwill and Other Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2024
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 values for other intangible assets and goodwill as of September 30, 2024 and December 31, 2023:
$ in Millions |  | Weighted Average Economic Life (in years) |  | September 30, 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 (1) |  | 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 (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade names |  | 10.0 |  | 23.5 |  |  | 1.8 |  |  | 21.7 |  |  | — |  |  | — |  |  |  |  | — |
Agency relationships |  | 6.0 |  | 72.4 |  |  | 9.1 |  |  | 63.3 |  |  | — |  |  | — |  |  |  |  | — |
Developed technology |  | 3.0 |  | 4.7 |  |  | 1.1 |  |  | 3.6 |  |  | — |  |  | — |  |  |  |  | — |
Other |  | 0.3 |  | .4 |  |  | .4 |  |  | — |  |  | — |  |  | — |  |  |  |  | — |
Subtotal |  |  |  | 101.0 |  | 12.4 |  | 88.6 |  | — |  |  | — |  |  |  |  | — |
Other Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade names |  | 13.3 |  | 13.3 |  |  | 5.3 |  |  | 8.0 |  |  | 13.3 |  |  | 4.1 |  |  |  |  | 9.2 |
Customer relationships |  | 11.0 |  | 24.8 |  |  | 12.7 |  |  | 12.1 |  |  | 24.8 |  |  | 10.3 |  |  |  |  | 14.5 |
Other |  | 11.8 |  | 3.1 |  |  | 1.4 |  |  | 1.7 |  |  | 2.8 |  |  | 1.1 |  |  |  |  | 1.7 |
Subtotal |  |  |  | 41.2 |  |  | 19.4 |  |  | 21.8 |  |  | 40.9 |  |  | 15.5 |  |  |  |  | 25.4 |
Total other intangible assets | 320.1 |  |  | 33.6 |  |  | 286.5 |  |  | 218.8 |  |  | 17.0 |  |  |  |  | 201.8 |
Total goodwill and other intangible assets | $ | 759.3 |  |  | $ | 33.6 |  |  | $ | 725.7 |  |  | $ | 387.6 |  |  | $ | 17.0 |  |  |  |  | $ | 370.6 |
(1) The relative fair values of goodwill and other intangible assets recognized in connection with the acquisition of Bamboo had not yet been finalized as of September 30, 2024. The following tables present the change in goodwill and other intangible assets for the three and nine months ended September 30, 2024 and 2023:
|  | Three Months Ended September 30,
|  | 2024 |  | 2023
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 |  |  | $ | 291.8 |  |  | $ | 731.0 |  |  | $ | 168.8 |  |  | $ | 204.8 |  |  | $ | 373.6 |
Amortization |  | — |  |  | (5.3) |  |  | (5.3) |  |  | — |  |  | (1.5) |  |  | (1.5) |
Ending balance |  | $ | 439.2 |  |  | $ | 286.5 |  |  | $ | 725.7 |  |  | $ | 168.8 |  |  | $ | 203.3 |  |  | $ | 372.1 |
|  | Nine Months Ended September 30,
|  | 2024 |  | 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 |
Acquisition 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 |  | — |  |  | (16.6) |  |  | (16.6) |  |  | — |  |  | (5.7) |  |  | (5.7) |
Ending balance |  | $ | 439.2 |  |  | $ | 286.5 |  |  | $ | 725.7 |  |  | $ | 168.8 |  |  | $ | 203.3 |  |  | $ | 372.1 |
(1) Amounts relate to the fair values of goodwill and other intangible assets recognized in connection with the acquisition of Bamboo, which had not yet been finalized as of September 30, 2024. (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. During the nine months ended September 30, 2023, adjustments relate to an acquisition within Other Operations.

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- Definition Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class. + 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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