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v3.25.1

Third-Party Reinsurance (Tables) | 3 Months Ended
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Mar. 31, 2025
Reinsurance Disclosures [Abstract] |
Effects of reinsurance | The following table summarizes the effects of reinsurance on written and earned premiums and loss and LAE for the Ark/WM Outrigger segment for the three months ended March 31, 2025 and 2024:
Millions |  |  |  | Three Months Ended March 31, |
|  |  |  |  |  | 2025 |  | 2024 |
Written premiums: |  |  |  |  |  |  |  |  |
Direct |  |  |  |  |  | $ | 416.8 |  |  | $ | 285.0 |  |
Assumed |  |  |  |  |  | 690.8 |  |  | 587.1 |  |
Gross written premiums |  |  |  |  |  | 1,107.6 |  |  | 872.1 |  |
Ceded (1) |  |  |  |  |  | (379.9) |  |  | (274.1) |  |
Net written premiums |  |  |  |  |  | $ | 727.7 |  |  | $ | 598.0 |  |
Earned premiums: |  |  |  |  |  |  |  |  |
Direct |  |  |  |  |  | $ | 246.3 |  |  | $ | 194.4 |  |
Assumed |  |  |  |  |  | 214.1 |  |  | 192.4 |  |
Gross earned premiums |  |  |  |  |  | 460.4 |  |  | 386.8 |  |
Ceded (2) |  |  |  |  |  | (102.4) |  |  | (84.0) |  |
Net earned premiums |  |  |  |  |  | $ | 358.0 |  |  | $ | 302.8 |  |
Loss and LAE: |  |  |  |  |  |  |  |  |
Gross |  |  |  |  |  | $ | 323.2 |  |  | $ | 253.3 |  |
Ceded (3) |  |  |  |  |  | (89.7) |  |  | (73.3) |  |
Net loss and LAE |  |  |  |  |  | $ | 233.5 |  |  | $ | 180.0 |  |
(1) The three months ended March 31, 2025 and 2024 exclude $37.5 and $34.3 ceded by Ark to WM Outrigger Re, which eliminate in White Mountains’s consolidated financial statements. (2) The three months ended March 31, 2025 and 2024 exclude $12.0 and $10.3, ceded by Ark to WM Outrigger Re, which eliminate in White Mountains’s consolidated financial statements. (3) The three months ended March 31, 2025 and 2024 exclude $20.2 and $0.7, ceded by Ark to WM Outrigger Re, which eliminate in White Mountains’s consolidated financial statements. The following table presents the Ark/WM Outrigger segment’s reinsurance recoverables as of March 31, 2025 and December 31, 2024:
Millions |  | March 31, 2025 |  | December 31, 2024
Reinsurance recoverables on unpaid losses (1) |  | $ | 480.6 |  |  | $ | 434.4 |
Reinsurance recoverables on paid losses (2) |  | 65.4 |  |  | 57.5 |
Ceded unearned premiums (3) |  | 374.4 |  |  | 97.1 |
Reinsurance recoverables |  | $ | 920.4 |  |  | $ | 589.0 |
(1) The reinsurance recoverables on unpaid losses exclude $38.6 and $31.8 ceded by Ark to WM Outrigger Re as of March 31, 2025 and December 31, 2024, which eliminate in White Mountains’s consolidated financial statements. (2) The reinsurance recoverables on paid losses exclude $1.7 and $3.1 ceded by Ark to WM Outrigger Re as of March 31, 2025 and December 31, 2024, which eliminate in White Mountains’s consolidated financial statements. (3) The ceded unearned premiums exclude $29.8 and $4.3 ceded by Ark to WM Outrigger Re as of March 31, 2025 and December 31, 2024, which eliminate in White Mountains’s consolidated financial statements. The following table presents gross written premiums and gross earned premiums included in the HG Global segment for the three months ended March 31, 2025 and 2024:
|  | Three Months Ended March 31, 2025 |  | Three Months Ended March 31, 2024
Millions |  |  | HG Global |  | BAM |  | Eliminations |  | Total
Written premiums: |  |  |  |  |  |  |  |  |  |
Direct |  | $ | — |  |  | $ | — |  |  | $ | 10.5 |  |  | $ | — |  |  | $ | 10.5 |
Assumed |  | 6.7 |  |  | 8.9 |  |  | — |  |  | (8.9) |  |  | — |
Gross written premiums (1) |  | $ | 6.7 |  |  | $ | 8.9 |  |  | $ | 10.5 |  |  | $ | (8.9) |  |  | $ | 10.5 |
Earned premiums: |  |  |  |  |  |  |  |  |  |
Direct |  | $ | — |  |  | $ | — |  |  | $ | 7.3 |  |  | $ | — |  |  | $ | 7.3 |
Assumed |  | 8.2 |  |  | 6.5 |  |  | .5 |  |  | (6.5) |  |  | .5 |
Gross earned premiums (1) |  | $ | 8.2 |  |  | $ | 6.5 |  |  | $ | 7.8 |  |  | $ | (6.5) |  |  | $ | 7.8 |
(1) For the three months ended March 31, 2024, BAM ceded written premiums of $8.9 and earned premiums of $6.5 to HG Global, which eliminated in consolidation.
Gross and net reinsurance recoverables by reinsurers ratings | The following table presents the Ark/WM Outrigger segment’s gross and net reinsurance recoverables by the reinsurers’ A.M. Best Company, Inc (“A.M. Best”) ratings as of March 31, 2025:
$ in Millions |  | As of March 31, 2025
A.M. Best Rating (1) |  | Gross |  | Collateral |  | Net |  | % of Total
A+ or better |  | $ | 336.9 |  |  | $ | — |  |  | $ | 336.9 |  |  | 73.9 | %
A- to A |  | 110.2 |  | — |  |  | 110.2 |  | 24.2 |
B++ or lower and not rated (2) |  | 98.9 |  | 90.2 |  | 8.7 |  |  | 1.9 |
Total |  | $ | 546.0 |  |  | $ | 90.2 |  |  | $ | 455.8 |  |  | 100.0 | %
(1) A.M. Best financial strength ratings as detailed above are: “A+ or better” (Superior) “A- to A” (Excellent), “B++” (Good). (2) Excludes $40.3 ceded by Ark to WM Outrigger Re as of March 31, 2025, which eliminates in White Mountains’s consolidated financial statements.

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- Definition Tabular disclosure of the effects of reinsurance, for example, but not limited to, disclosure of direct, assumed, and ceded insurance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 605 -Topic 944 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479032/944-605-50-1 + Details
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- Definition Tabular disclosure of reinsurer or group of reinsurers for whom the entity has a concentration of credit risk. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 50 -Paragraph 1B -SubTopic 825 -Topic 944 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477351/944-825-50-1B + Details
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