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Goodwill and Other Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2023
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, 2023 and December 31, 2022:
$ in Millions |  | Weighted Average Economic Life (in years) |  | March 31, 2023 |  | December 31, 2022
| 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 |
Other Operations |  | N/A |  | 44.4 |  |  | — |  |  | 44.4 |  |  | 52.1 |  |  | — |  |  |  |  | 52.1 |
Total goodwill |  | 168.8 |  |  | — |  |  | 168.8 |  |  | 176.5 |  |  | — |  |  |  |  | 176.5 |
Other intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ark |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Underwriting capacity | N/A |  | 175.7 |  |  | — |  |  | 175.7 |  |  | 175.7 |  |  | — |  |  |  |  | 175.7 |
Kudu |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade names |  | 7 |  | 2.2 |  |  | 1.3 |  |  | .9 |  |  | 2.2 |  |  | 1.2 |  |  |  |  | 1.0 |
Other Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade names |  | 13.3 |  | 13.3 |  |  | 2.6 |  |  | 10.7 |  |  | 17.9 |  |  | 3.0 |  |  |  |  | 14.9 |
Customer relationships |  | 11.0 |  | 24.8 |  |  | 7.0 |  |  | 17.8 |  |  | 29.5 |  |  | 7.5 |  |  |  |  | 22.0 |
Other |  | 12.1 |  | 2.8 |  |  | .5 |  |  | 2.3 |  |  | 2.8 |  |  | .5 |  |  |  |  | 2.3 |
Subtotal |  |  |  | 40.9 |  |  | 10.1 |  |  | 30.8 |  |  | 50.2 |  |  | 11.0 |  |  |  |  | 39.2 |
Total other intangible assets | 218.8 |  |  | 11.4 |  |  | 207.4 |  |  | 228.1 |  |  | 12.2 |  |  |  |  | 215.9 |
Total goodwill and other intangible assets | $ | 387.6 |  |  | $ | 11.4 |  |  | 376.2 |  |  | $ | 404.6 |  |  | $ | 12.2 |  |  |  |  | 392.4 |
The following table presents the change in goodwill and other intangible assets for the three months ended March 31, 2023 and 2022:
|  | Three Months Ended March 31,
|  | 2023 |  | 2022
Millions |  | Goodwill |  | Other Intangible Assets |  | Total Goodwill and Other Intangible Assets |  | Goodwill |  | Other Intangible Assets |  | Total Goodwill and Other Intangible Assets
Beginning balance |  | $ | 176.5 |  |  | $ | 215.9 |  |  | $ | 392.4 |  |  | $ | 142.3 |  |  | $ | 198.2 |  |  | $ | 340.5 |
Dispositions (1) |  | (6.7) |  |  | (6.9) |  |  | (13.6) |  |  | — |  |  | — |  |  | — |
Measurement period adjustments (2) |  | (1.0) |  |  | — |  |  | (1.0) |  |  | — |  |  | — |  |  | — |
Amortization |  | — |  |  | (1.6) |  |  | (1.6) |  |  | — |  |  | (1.0) |  |  | (1.0) |
Ending balance |  | $ | 168.8 |  |  | $ | 207.4 |  |  | $ | 376.2 |  |  | $ | 142.3 |  |  | $ | 197.2 |  |  | $ | 339.5 |
(1) Relates to a disposition within Other Operations. (2) 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. The relative fair values of goodwill and other intangible assets recognized in connection with this acquisition during 2022 had not yet been finalized as of the end of the period.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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