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Segment Information | 3 Months Ended
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Mar. 31, 2024
Segment Reporting [Abstract] |
Segment Information | Segment Information As of March 31, 2024, White Mountains conducted its operations through four reportable segments: (1) Ark/WM Outrigger, (2) HG Global/BAM, (3) Kudu and (4) Bamboo, with our remaining operating businesses, holding companies and other assets included in Other Operations. White Mountains has made its segment determination based on consideration of the following criteria: (i) the nature of the business activities of each of the Company’s subsidiaries and affiliates; (ii) the manner in which the Company’s subsidiaries and affiliates are organized; (iii) the existence of primary managers responsible for specific subsidiaries and affiliates; and (iv) the organization of information provided to the chief operating decision makers and the Board of Directors. Significant intercompany transactions among White Mountains’s segments have been eliminated herein. As a result of the Bamboo Transaction, White Mountains began consolidating Bamboo in its financial statements as of January 2, 2024. See Note 2 — “Significant Transaction”. The following tables present the financial information for White Mountains’s segments for the three months ended March 31, 2024 and 2023:
|  | Ark/WM Outrigger |  | HG Global/BAM |  |  |  |  |  | Other Operations |  |
Millions |  | Ark |  | WM Outrigger Re |  | HG Global |  | BAM (2) |  | Kudu |  | Bamboo |  |  | Total
Three Months Ended March 31, 2024 |  |  |  |  |  |  |  |  |  |
Earned insurance premiums (1) |  | $ | 292.5 |  |  | $ | 10.3 |  |  | $ | 6.5 |  |  | $ | 1.3 |  |  | $ | — |  |  | $ | 8.4 |  |  | $ | — |  |  | $ | 319.0 |
Net investment income (3) |  | 17.0 |  |  | 2.9 |  |  | 5.4 |  |  | 4.3 |  |  | 17.2 |  |  | .3 |  |  | 9.9 |  |  | 57.0 |
Net investment income (expense) - BAM Surplus Note interest |  | — |  |  | — |  |  | 6.6 |  |  | (6.6) |  |  | — |  |  | — |  |  | — |  |  | — |
Net realized and unrealized investment gains (losses) (3) |  | 10.6 |  |  | — |  |  | (7.3) |  |  | (2.8) |  |  | (6.5) |  |  | (.1) |  |  | 22.2 |  |  | 16.1 |
Net realized and unrealized investment gains (losses) from investment in MediaAlpha | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 210.7 |  |  | 210.7 |
Commission and fee revenues |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 21.9 |  |  | 3.6 |  |  | 25.5 |
Other revenues |  | 3.5 |  |  | — |  |  | — |  |  | .5 |  |  | — |  |  | .6 |  |  | 14.4 |  |  | 19.0 |
Total revenues |  | 323.6 |  |  | 13.2 |  |  | 11.2 |  |  | (3.3) |  |  | 10.7 |  |  | 31.1 |  |  | 260.8 |  |  | 647.3 |
Loss and loss adjustment expenses |  | 179.3 |  |  | .7 |  |  | — |  |  | — |  |  | — |  |  | 5.8 |  |  | — |  |  | 185.8 |
Acquisition expenses |  | 63.7 |  |  | 2.6 |  |  | 1.8 |  |  | .4 |  |  | — |  |  | 3.1 |  |  | — |  |  | 71.6 |
Cost of sales |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 7.6 |  |  | 7.6 |
Broker commission expenses |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 9.3 |  |  | — |  |  | 9.3 |
General and administrative expenses |  | 42.2 |  |  | — |  |  | .4 |  |  | 16.9 |  |  | 3.4 |  |  | 12.0 |  |  | 50.3 |  |  | 125.2 |
Change in fair value of contingent consideration | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Interest expense |  | 5.4 |  |  | — |  |  | 3.5 |  |  | — |  |  | 5.6 |  |  | — |  |  | .7 |  |  | 15.2 |
Total expenses |  | 290.6 |  |  | 3.3 |  |  | 5.7 |  |  | 17.3 |  |  | 9.0 |  |  | 30.2 |  |  | 58.6 |  |  | 414.7 |
Pre-tax income (loss) | $ | 33.0 |  |  | $ | 9.9 |  |  | $ | 5.5 |  |  | $ | (20.6) |  |  | $ | 1.7 |  |  | $ | .9 |  |  | $ | 202.2 |  |  | $ | 232.6 |
(1) Ark’s earned insurance premiums based on the location of Ark’s underwriting offices in the United Kingdom and Bermuda are $177.4 and $115.1. (2) BAM manages its affairs on a statutory accounting basis. BAM’s statutory surplus includes the BAM Surplus Notes and is not reduced by accruals of interest expense on the BAM Surplus Notes. BAM’s statutory surplus is reduced only after a payment of principal or interest has been approved by the NYDFS. (3) Bamboo’s net investment income and net realized and unrealized investment gains (losses) are included in other revenues in the consolidated statement of operations.
|  | Ark/WM Outrigger |  | HG Global/BAM |  |  |  | Other Operations |  |
Millions |  | Ark |  | WM Outrigger Re |  | HG Global |  | BAM (2) |  | Kudu |  |  | Total
Three Months Ended March 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earned insurance premiums (1) |  | $ | 249.9 |  |  | $ | 5.2 |  |  | $ | 6.4 |  |  | $ | 1.3 |  |  | $ | — |  |  | $ | — |  |  | $ | 262.8 |
Net investment income |  | 8.4 |  |  | 2.2 |  |  | 4.0 |  |  | 3.2 |  |  | 14.2 |  |  | 7.0 |  |  | 39.0 |
Net investment income (expense) - BAM Surplus Note interest |  | — |  |  | — |  |  | 6.6 |  |  | (6.6) |  |  | — |  |  | — |  |  | — |
Net realized and unrealized investment gains (losses) |  | 24.5 |  |  | — |  |  | 7.9 |  |  | 9.1 |  |  | 29.6 |  |  | 41.8 |  |  | 112.9 |
Net realized and unrealized investment gains (losses) from investment in MediaAlpha |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 85.2 |  |  | 85.2 |
Commission and fee revenues |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 3.3 |  |  | 3.3 |
Other revenues |  | (2.7) |  |  | — |  |  | — |  |  | .8 |  |  | — |  |  | 30.6 |  |  | 28.7 |
Total revenues |  | 280.1 |  |  | 7.4 |  |  | 24.9 |  |  | 7.8 |  |  | 43.8 |  |  | 167.9 |  |  | 531.9 |
Loss and loss adjustment expenses |  | 147.6 |  |  | .2 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 147.8 |
Acquisition expenses |  | 58.9 |  |  | .9 |  |  | 1.8 |  |  | .9 |  |  | — |  |  | — |  |  | 62.5 |
Cost of sales |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 13.9 |  |  | 13.9 |
General and administrative expenses |  | 35.1 |  |  | .1 |  |  | 1.1 |  |  | 16.2 |  |  | 3.8 |  |  | 39.7 |  |  | 96.0 |
Change in fair value of contingent consideration | (2.4) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (2.4) |
Interest expense |  | 5.0 |  |  | — |  |  | 4.5 |  |  | — |  |  | 4.7 |  |  | .8 |  |  | 15.0 |
Total expenses |  | 244.2 |  |  | 1.2 |  |  | 7.4 |  |  | 17.1 |  |  | 8.5 |  |  | 54.4 |  |  | 332.8 |
Pre-tax income (loss) |  | $ | 35.9 |  |  | $ | 6.2 |  |  | $ | 17.5 |  |  | $ | (9.3) |  |  | $ | 35.3 |  |  | $ | 113.5 |  |  | $ | 199.1 |
(1) Ark’s earned insurance premiums based on the location of Ark’s underwriting offices in the United Kingdom and Bermuda are $146.0 and $104.0. (2) BAM manages its affairs on a statutory accounting basis. BAM’s statutory surplus includes the BAM Surplus Notes and is not reduced by accruals of interest expense on the BAM Surplus Notes. BAM’s statutory surplus is reduced only after a payment of principal or interest has been approved by the NYDFS.

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-22 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-15 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 31 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-31 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-42 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-40 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//280/tableOfContent Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 26 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-26 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 34 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-34 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 41 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-41 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-21 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-21 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 + Details
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