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Significant Transactions (Tables) | 12 Months Ended
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Dec. 31, 2022
Significant Transactions [Abstract] |
Schedule of Recognized Identified Assets Acquired | The following presents additional details of the assets acquired and liabilities assumed as of the January 1, 2021 acquisition date:
Millions |  | As of January 1, 2021 |
Investments |  | $ | 594.3 |
Cash |  | 52.0 | (1)
Reinsurance recoverables |  | 433.4 |
Insurance premiums receivable |  | 236.7 |
Ceded unearned premiums |  | 170.2 |
Value of in-force business acquired |  | 71.7 |
Other assets |  | 88.9 |
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 acquired |  | 24.5 |
Goodwill |  | 116.8 |
Other intangible assets - syndicate underwriting capacity |  | 175.7 |
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 the economic lives, acquisition date fair values, accumulated amortization and net carrying values for other intangible assets and goodwill, by company as of December 31, 2022 and 2021:
$ in Millions |  | Weighted Average Economic Life (in years) |  | December 31, 2022 |  | December 31, 2021
| 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 |  | 52.1 |  |  | — |  |  |  |  | 52.1 |  |  | 17.9 |  |  | — |  |  |  |  | 17.9 |
Total goodwill |  |  |  | 176.5 |  |  | — |  |  |  |  | 176.5 |  |  | 142.3 |  |  | — |  |  |  |  | 142.3 |
Other intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ark |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Underwriting capacity |  | N/A |  | 175.7 |  |  | — |  |  |  |  | 175.7 |  |  | 175.7 |  |  | — |  |  |  |  | 175.7 |
Kudu |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade names |  | 7 |  | 2.2 |  |  | 1.2 |  |  |  |  | 1.0 |  |  | 2.2 |  |  | .9 |  |  |  |  | 1.3 |
Other Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade names |  | 15.9 |  | 17.9 |  |  | 3.0 |  |  |  |  | 14.9 |  |  | 8.2 |  |  | 1.5 |  |  |  |  | 6.7 |
Customer relationships |  | 12.4 |  | 29.5 |  |  | 7.5 |  |  |  |  | 22.0 |  |  | 18.8 |  |  | 4.5 |  |  |  |  | 14.3 |
Other |  | 12.1 |  | 2.8 |  |  | .5 |  |  |  |  | 2.3 |  |  | .3 |  |  | .1 |  |  |  |  | .2 |
Subtotal | 50.2 |  |  | 11.0 |  |  |  |  | 39.2 |  |  | 27.3 |  |  | 6.1 |  |  |  |  | 21.2 |
Total other intangible assets | 228.1 |  |  | 12.2 |  |  |  |  | 215.9 |  |  | 205.2 |  |  | 7.0 |  |  |  |  | 198.2 |
Total goodwill and other intangible assets | $ | 404.6 |  |  | $ | 12.2 |  |  |  |  | 392.4 |  |  | $ | 347.5 |  |  | 7.0 |  |  |  |  | 340.5 |
Goodwill and other intangible assets attributed to non-controlling interests | (102.7) |  |  |  |  |  |  |  |  | (91.8) |
Goodwill and other intangible assets included in White Mountains’s common shareholders’ equity |  | $ | 289.7 |  |  |  |  |  |  |  |  | $ | 248.7 |

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- Definition Tabular disclosure of the amounts recognized as of the acquisition date for each major class of assets acquired and liabilities assumed. May include but not limited to the following: (a) acquired receivables; (b) contingencies recognized at the acquisition date; and (c) the fair value of noncontrolling interests in the acquiree. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=128092470&loc=d3e4845-128472 + Details
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- Definition Significant Transactions [Abstract] + References No definition available. + Details
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