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Goodwill and Other Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 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 March 31, 2024 and December 31, 2023:
$ in Millions |  | Weighted Average Economic Life (in years) |  | March 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 (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 |  |  | 1.6 |  |  | .6 |  |  | 2.2 |  |  | 1.5 |  |  |  |  | .7 |
Bamboo (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade names |  | 10.0 |  | 23.5 |  |  | .5 |  |  | 23.0 |  |  | — |  |  | — |  |  |  |  | — |
Agency relationships |  | 6.0 |  | 72.4 |  |  | 2.9 |  |  | 69.5 |  |  | — |  |  | — |  |  |  |  | — |
Developed Technology |  | 3.0 |  | 4.7 |  |  | .4 |  |  | 4.3 |  |  | — |  |  | — |  |  |  |  | — |
Other |  | 0.3 |  | .4 |  |  | .4 |  |  | — |  |  | — |  |  | — |  |  |  |  | — |
Subtotal |  |  |  | 101.0 |  | 4.2 |  | 96.8 |  | — |  |  | — |  |  |  |  | — |
Other Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade names |  | 13.3 |  | 13.3 |  |  | 4.5 |  |  | 8.8 |  |  | 13.3 |  |  | 4.1 |  |  |  |  | 9.2 |
Customer relationships |  | 10.9 |  | 24.8 |  |  | 11.1 |  |  | 13.7 |  |  | 24.8 |  |  | 10.3 |  |  |  |  | 14.5 |
Other |  | 11.1 |  | 3.1 |  |  | 1.3 |  |  | 1.8 |  |  | 2.8 |  |  | 1.1 |  |  |  |  | 1.7 |
Subtotal |  |  |  | 41.2 |  |  | 16.9 |  |  | 24.3 |  |  | 40.9 |  |  | 15.5 |  |  |  |  | 25.4 |
Total other intangible assets | 320.1 |  |  | 22.7 |  |  | 297.4 |  |  | 218.8 |  |  | 17.0 |  |  |  |  | 201.8 |
Total goodwill and other intangible assets | $ | 759.3 |  |  | $ | 22.7 |  |  | $ | 736.6 |  |  | $ | 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 March 31, 2024. The following table presents the change in goodwill and other intangible assets for the three months ended March 31, 2024 and 2023:
|  | Three Months Ended March 31,
|  | 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 |  | — |  |  | (5.7) |  |  | (5.7) |  |  | — |  |  | (1.6) |  |  | (1.6) |
Ending balance |  | $ | 439.2 |  |  | $ | 297.4 |  |  | $ | 736.6 |  |  | $ | 168.8 |  |  | $ | 207.4 |  |  | $ | 376.2 |
(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 March 31, 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 three months ended March 31, 2023, adjustments relate to an acquisition within Other Operations.

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