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Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 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 value for other intangible assets and goodwill as of December 31, 2023 and 2022:

$ in Millions						Weighted Average Economic  Life (in years)						December 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						7.0						2.2						1.5												.7						2.2						1.2												1.0
Other Operations
Trade names						13.3						13.3						4.1												9.2						17.9						3.0												14.9
Customer relationships						10.9						24.8						10.3												14.5						29.5						7.5												22.0
Other						12.1						2.8						1.1												1.7						2.8						.5												2.3
Subtotal												40.9						15.5												25.4						50.2						11.0												39.2
Total other intangible assets												218.8						17.0												201.8						228.1						12.2												215.9
Total goodwill and other intangible assets												$	387.6					$	17.0											370.6						$	404.6					12.2												392.4

The following table presents the change in goodwill and other intangible assets:

						December 31, 2023																		December 31, 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
Acquisition of businesses (1)						—						—						—						59.5						—						59.5
Disposition of businesses (2)						(6.7)						(6.9)						(13.6)						—						—						—
Attribution of acquisition date fair value    estimates between goodwill and other    intangible assets						—						—						—						(22.9)						22.9						—
Measurement period adjustments (3)						(1.0)						—						(1.0)						(2.4)						—						(2.4)
Amortization						—						(7.2)						(7.2)						—						(5.2)						(5.2)
Ending balance						$	168.8					$	201.8					$	370.6					$	176.5					$	215.9					$	392.4

(1) Relates to acquisitions within Other Operations.

(2) Relates to a disposition within Other Operations.

(3) Measurement period adjustments relate to updated information about acquisition date fair values of assets acquired and liabilities assumed. Adjustments relate to acquisitions within Other Operations.

Schedule of finite-lived intangible assets, future amortization expense

White Mountains expects to recognize amortization expense in each of the next five years as presented in the following table:

Millions						Amortization Expense
2024						$	5.5
2025						4.8
2026						4.0
2027						3.6
2028 and years after						8.2
Total (1)						$	26.1

(1) Excludes Ark’s indefinite-lived intangible assets of $175.7.

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- References

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

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-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

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Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482665/350-30-50-2

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