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Goodwill and Other Intangible Assets (Tables)
9 Months Ended
Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Intangible Assets and Goodwill
The following table presents the acquisition date fair values, accumulated amortization and net carrying values for other intangible assets and goodwill, by segment as of September 30, 2021 and December 31, 2020:
$ in MillionsWeighted Average Economic
 Life
(in years)
September 30, 2021December 31, 2020
Acquisition Date Fair ValueAccumulated AmortizationImpairments and Amounts Allocated to Held for SaleNet Carrying ValueAcquisition Date Fair ValueAccumulated AmortizationImpairmentsNet Carrying Value
Goodwill:
ArkN/A$116.8 $ $ $116.8 $— $— $— $— 
NSM (1)
N/A559.8  30.2 529.6 506.4 — — 506.4 
KuduN/A7.6   7.6 7.6 — — 7.6 
Other OperationsN/A17.4   17.4 11.5 — — 11.5 
Total goodwill701.6  30.2 671.4 525.5 — — 525.5 
Other intangible assets:
Ark
    Underwriting CapacityN/A175.7   175.7 — — — — 
NSM (1)
Customer
   relationships
8.9136.0 50.6 3.5 81.9 136.2 36.7 3.5 96.0 
   Trade names1665.3 10.9 1.0 53.4 65.4 8.3 1.0 56.1 
   Information
      technology
      platform
03.1 1.4 1.7  3.1 1.4 1.7 — 
Renewal rights1282.5 13.1  69.4 82.5 4.9 — 77.6 
Other3.41.1 .6  .5 1.7 1.0 — .7 
      Subtotal288.0 76.6 6.2 205.2 288.9 52.3 6.2 230.4 
Kudu
   Trade names72.2 .8  1.4 2.2 .6 — 1.6 
Other Operations
   Trade names18.18.2 1.0  7.2 3.6 .3 — 3.3 
Customer
   relationships
13.318.9 3.5  15.4 14.2 1.4 — 12.8 
Insurance
   Licenses
N/A8.6   8.6 8.6 — — 8.6 
Other5.4.3 .2  .1 .3 .1 — .2 
       Subtotal36.0 4.7  31.3 26.7 1.8 — 24.9 
Total other intangible assets501.9 82.1 6.2 413.6 317.8 54.7 6.2 256.9 
Total goodwill and other
   intangible assets
$1,203.5 $82.1 $36.4 1,085.0 $843.3 $54.7 6.2 782.4 
Goodwill and other intangible assets attributed to non-controlling interests(118.0)(28.1)
Goodwill and other intangible assets included in White Mountains’s
   common shareholders’ equity
$967.0 $754.3 
(1) As of September 30, 2021, NSM’s goodwill and intangible assets included $(2.3) and $(0.2) of the effect of foreign currency translation. As of December 31, 2020, NSM’s goodwill and intangible assets included $13.4 and $1.6 of the effect of foreign currency translation.
The following tables present the change in goodwill and other intangible assets for the three and nine months ended September 30, 2021 and 2020:
Three Months Ended September 30,
20212020
MillionsGoodwillOther Intangible AssetsTotal Goodwill and Other Intangible AssetsGoodwillOther Intangible AssetsTotal Goodwill and Other Intangible Assets
Beginning balance$629.4 $414.8 $1,044.2 $518.2 $241.7 $759.9 
Acquisition of businesses55.7 
(1)
 55.7 14.9 
(2)
— 14.9 
Attribution of acquisition date fair value
   estimates between goodwill and other
   intangible assets (3)
(9.3)9.3  — — — 
Foreign currency translation(4.0)(.3)(4.3)7.0 (.1)6.9 
Measurement period adjustments (4)
(.4) (.4)— — — 
Amortization (10.2)(10.2)— (5.4)(5.4)
Ending balance$671.4 $413.6 $1,085.0 $540.1 $236.2 $776.3 
(1) The relative fair values of goodwill and other intangible assets recognized in connection with the acquisition of J.C. Taylor had not yet been finalized at September 30, 2021.
(2) The relative fair values of goodwill and other intangible assets recognized in connection with an acquisition within Other Operations had not yet been finalized at September 30, 2020.
(3) Relates to an acquisition within the Other Operations segment.
(4) 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, 2021, adjustments relate to an acquisition within the Other Operations segment.

Nine Months Ended September 30,
20212020
MillionsGoodwillOther Intangible AssetsTotal Goodwill and Other Intangible AssetsGoodwillOther Intangible AssetsTotal Goodwill and Other Intangible Assets
Beginning balance$525.5 $256.9 $782.4 $394.7 $260.0 $654.7 
Attribution of acquisition date fair value
   estimates between goodwill and other
   intangible assets (1)
(9.3)9.3  — — — 
Ark Transaction116.8 175.7 292.5 — — — 
Acquisition of businesses71.5 
(2)
 71.5 140.0 
(3)
— 140.0 
Foreign currency translation(2.3)(.2)(2.5)5.2 (.5)4.7 
Impairments   — (6.2)(6.2)
Loss on assets held for sale (4)
(30.2) (30.2)   
Measurement period adjustments (5)
(.6) (.6).2 — .2 
Amortization (28.1)(28.1)— (17.1)(17.1)
Ending balance$671.4 $413.6 $1,085.0 $540.1 $236.2 $776.3 
(1) Relates to an acquisition within the Other Operations segment.
(2) The relative fair values of goodwill and other intangible assets of $55.7 recognized in connection with the acquisition of J.C. Taylor had not yet been finalized at September 30, 2021. The remaining $15.8 relates to the relative fair values of goodwill and other intangible assets recognized in connection with an acquisition within the Other Operations segment.
(3) The relative fair values of goodwill and other intangible assets recognized in connection with the acquisition of Kingsbridge and an acquisition within Other Operations had not yet been finalized at September 30, 2020.
(4) Relates to the sale of NSM’s Fresh Insurance’s motor business recorded in the first quarter of 2021. This amount excludes $1.5 of net proceeds related to the sale.
(5) 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, 2021, adjustments relate to acquisitions within the Other Operations segment.
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed
The following presents additional details of the assets acquired and liabilities assumed as of the January 1, 2021 acquisition date:
MillionsAs of January 1, 2021
Investments$594.3
Cash52.0
(1)
Reinsurance recoverables433.4
Insurance premiums receivable236.7
Ceded unearned premiums170.2
Value of in-force business acquired71.7
Other assets88.9
Loss and loss adjustment expense reserves(696.0)
Unearned insurance premiums(326.1)
Debt(46.4)
Ceded reinsurance payable(528.3)
Other liabilities(25.9)
   Net tangible assets acquired24.5
Goodwill 116.8
Other intangible assets - syndicate underwriting capacity175.7
Deferred tax liability on other intangible assets(33.4)
  Net assets acquired$283.6
(1) Cash excludes the White Mountains cash contribution of $605.4 as part of the Ark transaction.
The following table presents a summary of the acquisition date fair values of goodwill and other intangible assets for acquisitions completed from January 1, 2020 through September 30, 2021:
$ in Millions
Acquisition of subsidiary/ asset
Goodwill and
Other intangible asset (1)
Acquisition Date
Kingsbridge$131.7 April 7, 2020
J.C. Taylor55.7 August 6, 2021
Total NSM segment$187.4 
Ark$292.5 January 1, 2021
Other Operations$30.6 Various
(1) Acquisition date fair values include the effect of adjustments during the measurement period and excludes the effect of foreign currency translation subsequent to the acquisition date.