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Goodwill and Other Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 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 September 30, 2025 and December 31, 2024:
$ in MillionsWeighted Average Economic
 Life
(in years)		September 30, 2025December 31, 2024
Acquisition Date Fair ValueAccumulated AmortizationNet Carrying ValueAcquisition Date Fair ValueAccumulated AmortizationNet Carrying Value
Goodwill:
ArkN/A$116.8 $— $116.8 $116.8 $— $116.8 
KuduN/A7.6 — 7.6 7.6 — 7.6 
Bamboo
N/A270.4 — 270.4 270.4 — 270.4 
Distinguished (1)
N/A595.4 — 595.4 — — — 
Other Operations (1)
N/A102.1 — 102.1 44.4 — 44.4 
Total goodwill1,092.3 — 1,092.3 439.2 — 439.2 
Other intangible assets:
Ark
Underwriting capacityN/A175.7 — 175.7 175.7 — 175.7 
Kudu
Trade names7.02.2 2.1 .1 2.2 1.8 .4 
Bamboo
Trade names10.023.5 4.1 19.4 23.5 2.3 21.2 
Agency relationships6.072.4 21.1 51.3 72.4 12.1 60.3 
Developed technology3.04.7 2.8 1.9 4.7 1.6 3.1 
Other 0.3.4 .4 — .4 .4 — 
Subtotal101.028.472.6101.0 16.4 84.6 
Other Operations (1)
Trade names11.822.4 7.1 15.3 13.3 5.6 7.7 
Customer relationships8.853.3 17.7 35.6 24.8 13.6 11.2 
Other
11.73.1 1.8 1.3 3.1 1.6 1.5 
Subtotal78.8 26.6 52.2 41.2 20.8 20.4 
Total other intangible assets357.7 57.1 300.6 320.1 39.0 281.1 
Total goodwill and other intangible assets
$1,450.0 $57.1 $1,392.9 $759.3 $39.0 $720.3 
(1) The relative fair values of goodwill and other intangible assets recognized in connection with the Distinguished Transaction and the Enterprise Solutions Transaction had not yet been finalized. All amounts related to the Distinguished Transaction were reflected as goodwill as of September 30, 2025. See Note 2 — “Significant Transactions.”
The following tables present the change in goodwill and other intangible assets for the three and nine months ended September 30, 2025 and 2024:

Three Months Ended September 30,
20252024
MillionsGoodwillOther Intangible AssetsTotal Goodwill and Other Intangible AssetsGoodwillOther Intangible AssetsTotal Goodwill and Other Intangible Assets
Beginning balance$534.6 $270.8 $805.4 $439.2 $291.8 $731.0 
Acquisition of businesses (1)
595.4 — 595.4 — — — 
Attribution of acquisition date fair
   value estimates between goodwill
   and other intangible assets (1)
(37.7)37.6 (.1)— — — 
Amortization— (7.8)(7.8)— (5.3)(5.3)
Ending balance$1,092.3 $300.6 $1,392.9 $439.2 $286.5 $725.7 
(1) During the three months ended September 30, 2025, amounts relate to the Distinguished Transaction and the Enterprise Solutions Transaction. For the Distinguished Transaction, the relative fair values of goodwill and other intangible assets had not yet been finalized; accordingly, all amounts were reflected as goodwill as of September 30, 2025. See Note 2 — “Significant Transactions.”
Nine Months Ended September 30,
20252024
MillionsGoodwillOther Intangible AssetsTotal Goodwill and Other Intangible AssetsGoodwillOther Intangible AssetsTotal 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 
Attribution of acquisition date fair
   value estimates between goodwill
   and other intangible assets (1)
(37.7)37.6 (.1)— — — 
Amortization— (18.1)(18.1)— (16.6)(16.6)
Ending balance$1,092.3 $300.6 $1,392.9 $439.2 $286.5 $725.7 
(1) During the nine months ended September 30, 2025, amounts relate to the Distinguished Transaction and the Enterprise Solutions Transaction. For the Distinguished Transaction the relative fair values of goodwill and other intangible assets had not yet been finalized; accordingly, all amounts were reflected as goodwill as of September 30, 2025. During the nine months ended September 30, 2024, amounts relate to the acquisition of Bamboo, for which the relative fair values of goodwill and other intangible assets had not yet been finalized as of September 30, 2024. See Note 2 — “Significant Transactions.”
(2) Relates to acquisitions within Other Operations.