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Segment Information - Financial Information for White Mountain's Segments (Details) - USD ($) $ in Millions | 11 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 05, 2025 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Segment reporting information |  |  |  |
Earned insurance premiums |  | $ 1,777.1 | $ 1,691.6 | $ 1,440.9
Net investment income |  | 248.0 | 227.4 | 194.2
Net realized and unrealized investment gains (losses) |  | 361.5 | 184.9 | 434.2
Interest income from BAM Surplus Notes |  | 29.8 | 15.8 | 0.0
Change in fair value of BAM Surplus Notes |  | (37.5) | 0.5 | 0.0
Unrealized loss on deconsolidation of BAM |  | 0.0 | (114.5) | 0.0
Commission and fee revenues |  | 284.5 | 149.4 | 13.2
Net gain on sale of the Bamboo Group |  | 849.3 | 0.0 | 0.0
Other revenues |  | 222.3 | 84.7 | 84.2
Total revenues |  | 3,735.0 | 2,239.8 | 2,166.7
Loss and loss adjustment expenses |  | 882.2 | 888.5 | 726.8
Acquisition expenses |  | 420.2 | 341.5 | 290.1
Cost of sales |  | 151.8 | 29.6 | 40.4
Broker commission expense |  | 94.1 | 51.3 |
General and administrative expenses |  | 606.6 | 490.1 | 432.6
Change in fair value of contingent consideration |  | 173.0 | 61.3 | 48.7
Interest expense |  | 78.4 | 60.8 | 62.7
Total expenses |  | 2,406.3 | 1,923.1 | 1,601.3
Pre-tax income (loss) |  | 1,328.7 | 316.7 | 565.4
Other intangible assets, finite-lived, accumulated amortization |  | 38.9 | 39.0 |
Other Operations |  |  |  |
Segment reporting information |  |  |  |
Earned insurance premiums |  | 22.2 | 32.7 | 0.0
Net investment income |  | 32.1 | 35.6 | 30.1
Interest income from BAM Surplus Notes |  | 0.0 | 0.0 | 0.0
Change in fair value of BAM Surplus Notes |  | 0.0 |  |
Unrealized loss on deconsolidation of BAM |  |  | 0.0 |
Commission and fee revenues |  | 16.4 | 14.8 | 13.2
Net gain on sale of the Bamboo Group |  | 849.3 | 0.0 | 0.0
Other revenues |  | 200.6 | 56.8 | 80.5
Total revenues |  | 1,230.2 | 234.9 | 339.4
Loss and loss adjustment expenses |  | 20.0 | 12.1 | 0.0
Acquisition expenses |  | 8.3 | 12.1 | 0.0
Cost of sales |  | 151.8 | 29.6 | 40.4
Broker commission expense |  | 0.0 | 0.0 |
General and administrative expenses |  | 236.7 | 169.5 | 182.3
Change in fair value of contingent consideration |  | 0.0 | 0.0 | 0.0
Interest expense |  | 3.2 | 2.5 | 3.7
Total expenses |  | 420.0 | 225.8 | 226.4
Pre-tax income (loss) |  | 810.2 | 9.1 | 113.0
Other intangible assets, finite-lived, accumulated amortization |  | 29.0 | 20.8 |
Investments, Excluding MediaAlpha |  |  |  |
Segment reporting information |  |  |  |
Net realized and unrealized investment gains (losses) |  | 331.9 | 146.9 | 407.1
Investments, Excluding MediaAlpha | Other Operations |  |  |  |
Segment reporting information |  |  |  |
Net realized and unrealized investment gains (losses) |  | 80.0 | 57.0 | 188.5
MediaAlpha |  |  |  |
Segment reporting information |  |  |  |
Net realized and unrealized investment gains (losses) |  | 29.6 | 38.0 | 27.1
Change in fair value of BAM Surplus Notes |  |  | 0.5 |
MediaAlpha | Other Operations |  |  |  |
Segment reporting information |  |  |  |
Net realized and unrealized investment gains (losses) |  | 29.6 | 38.0 | 27.1
Change in fair value of BAM Surplus Notes |  |  | 0.0 |
P&C Insurance and Reinsurance (Ark/WM Outrigger) |  |  |  |
Segment reporting information |  |  |  |
Earned insurance premiums |  | 1,697.4 | 1,587.8 | 1,409.7
Loss and loss adjustment expenses |  | 844.2 | 855.8 | 726.8
P&C Insurance and Reinsurance (Ark/WM Outrigger) | Operating Segments |  |  |  |
Segment reporting information |  |  |  |
Earned insurance premiums |  | 1,697.4 | 1,587.8 | 1,409.7
Net investment income |  | 106.5 | 90.7 | 61.4
Net realized and unrealized investment gains (losses) |  | 124.6 | 50.1 | 85.9
Other revenues |  | 15.3 | 22.3 | 0.8
Loss and loss adjustment expenses |  | 844.2 | 855.8 | 726.8
Acquisition expenses |  | 394.2 | 307.1 | 281.5
General and administrative expenses |  | 205.1 | 208.4 | 162.0
Change in fair value of contingent consideration |  | 173.0 | 61.3 | 48.7
Interest expense |  | 17.1 | 19.5 | 21.3
Total expenses |  | 1,633.6 | 1,452.1 | 1,240.3
P&C Insurance and Reinsurance (Ark/WM Outrigger) | Ark | Operating Segments |  |  |  |
Segment reporting information |  |  |  |
Earned insurance premiums |  | 1,612.8 | 1,499.8 | 1,305.4
Net investment income |  | 97.4 | 79.4 | 50.4
Interest income from BAM Surplus Notes |  | 0.0 | 0.0 | 0.0
Change in fair value of BAM Surplus Notes |  | 0.0 |  |
Unrealized loss on deconsolidation of BAM |  |  | 0.0 |
Commission and fee revenues |  | 0.0 | 0.0 | 0.0
Net gain on sale of the Bamboo Group |  | 0.0 |  |
Other revenues |  | 15.3 | 22.3 | 0.8
Total revenues |  | 1,850.1 | 1,651.6 | 1,442.5
Loss and loss adjustment expenses |  | 818.8 | 825.9 | 711.2
Acquisition expenses |  | 371.1 | 283.9 | 251.0
Cost of sales |  | 0.0 | 0.0 | 0.0
Broker commission expense |  | 0.0 | 0.0 |
General and administrative expenses |  | 205.0 | 208.3 | 161.7
Change in fair value of contingent consideration |  | 173.0 | 61.3 | 48.7
Interest expense |  | 17.1 | 19.5 | 21.3
Total expenses |  | 1,585.0 | 1,398.9 | 1,193.9
Pre-tax income (loss) |  | 265.1 | 252.7 | 248.6
Other underwriting expenses |  | 143.9 | 136.1 | 113.6
P&C Insurance and Reinsurance (Ark/WM Outrigger) | Ark | Investments, Excluding MediaAlpha | Operating Segments |  |  |  |
Segment reporting information |  |  |  |
Net realized and unrealized investment gains (losses) |  | 124.6 | 50.1 | 85.9
P&C Insurance and Reinsurance (Ark/WM Outrigger) | Ark | MediaAlpha | Operating Segments |  |  |  |
Segment reporting information |  |  |  |
Net realized and unrealized investment gains (losses) |  | 0.0 | 0.0 | 0.0
Change in fair value of BAM Surplus Notes |  |  | 0.0 |
P&C Insurance and Reinsurance (Ark/WM Outrigger) | WM Outrigger Re - Segment | Operating Segments |  |  |  |
Segment reporting information |  |  |  |
Earned insurance premiums |  | 84.6 | 88.0 | 104.3
Net investment income |  | 9.1 | 11.3 | 11.0
Interest income from BAM Surplus Notes |  | 0.0 | 0.0 | 0.0
Change in fair value of BAM Surplus Notes |  | 0.0 |  |
Unrealized loss on deconsolidation of BAM |  |  | 0.0 |
Commission and fee revenues |  | 0.0 | 0.0 | 0.0
Net gain on sale of the Bamboo Group |  | 0.0 |  |
Other revenues |  | 0.0 | 0.0 | 0.0
Total revenues |  | 93.7 | 99.3 | 115.3
Loss and loss adjustment expenses |  | 25.4 | 29.9 | 15.6
Acquisition expenses |  | 23.1 | 23.2 | 30.5
Cost of sales |  | 0.0 | 0.0 | 0.0
Broker commission expense |  | 0.0 | 0.0 |
General and administrative expenses |  | 0.1 | 0.1 | 0.3
Change in fair value of contingent consideration |  | 0.0 | 0.0 | 0.0
Interest expense |  | 0.0 | 0.0 | 0.0
Total expenses |  | 48.6 | 53.2 | 46.4
Pre-tax income (loss) |  | 45.1 | 46.1 | 68.9
P&C Insurance and Reinsurance (Ark/WM Outrigger) | WM Outrigger Re - Segment | Investments, Excluding MediaAlpha | Operating Segments |  |  |  |
Segment reporting information |  |  |  |
Net realized and unrealized investment gains (losses) |  | 0.0 | 0.0 | 0.0
P&C Insurance and Reinsurance (Ark/WM Outrigger) | WM Outrigger Re - Segment | MediaAlpha | Operating Segments |  |  |  |
Segment reporting information |  |  |  |
Net realized and unrealized investment gains (losses) |  | 0.0 | 0.0 | 0.0
Change in fair value of BAM Surplus Notes |  |  | 0.0 |
Financial Guarantee (HG Global) |  |  |  |
Segment reporting information |  |  |  |
Earned insurance premiums |  | 30.8 | 31.7 | 31.2
Financial Guarantee (HG Global) | Operating Segments |  |  |  |
Segment reporting information |  |  |  |
Earned insurance premiums |  | 30.8 | 31.7 | 31.2
Net investment income |  | 27.1 | 32.2 | 31.7
Net realized and unrealized investment gains (losses) |  | 23.2 | (11.5) | 26.6
Interest income from BAM Surplus Notes |  | 29.8 | 15.8 | 0.0
Change in fair value of BAM Surplus Notes |  | (37.5) | 0.5 | 0.0
Unrealized loss on deconsolidation of BAM |  | 0.0 | (114.5) | 0.0
Other revenues |  | 0.2 | 1.2 | 2.9
Acquisition expenses |  | 8.0 | 8.2 | 8.6
General and administrative expenses |  | 3.1 | 35.7 | 68.9
Interest expense |  | 17.4 | 16.7 | 16.5
Total expenses |  | 28.5 | 60.6 | 94.0
Financial Guarantee (HG Global) | HG Global | Operating Segments |  |  |  |
Segment reporting information |  |  |  |
Earned insurance premiums |  | 30.8 | 28.9 | 26.0
Net investment income |  | 27.1 | 23.4 | 17.1
Interest income from BAM Surplus Notes |  | 29.8 | 29.0 | 26.2
Change in fair value of BAM Surplus Notes |  | (37.5) |  |
Unrealized loss on deconsolidation of BAM |  |  | (114.5) |
Commission and fee revenues |  | 0.0 | 0.0 | 0.0
Net gain on sale of the Bamboo Group |  | 0.0 |  |
Other revenues |  | 0.2 | 0.1 | 0.0
Total revenues |  | 73.6 | (39.0) | 82.9
Loss and loss adjustment expenses |  | 0.0 | 0.0 | 0.0
Acquisition expenses |  | 8.0 | 7.8 | 7.4
Cost of sales |  | 0.0 | 0.0 | 0.0
Broker commission expense |  | 0.0 | 0.0 |
General and administrative expenses |  | 3.1 | 2.2 | 2.8
Change in fair value of contingent consideration |  | 0.0 | 0.0 | 0.0
Interest expense |  | 17.4 | 16.7 | 16.5
Total expenses |  | 28.5 | 26.7 | 26.7
Pre-tax income (loss) |  | 45.1 | (65.7) | 56.2
Financial Guarantee (HG Global) | HG Global | Investments, Excluding MediaAlpha | Operating Segments |  |  |  |
Segment reporting information |  |  |  |
Net realized and unrealized investment gains (losses) |  | 23.2 | (6.4) | 13.6
Financial Guarantee (HG Global) | HG Global | MediaAlpha | Operating Segments |  |  |  |
Segment reporting information |  |  |  |
Net realized and unrealized investment gains (losses) |  | 0.0 | 0.0 | 0.0
Change in fair value of BAM Surplus Notes |  |  | 0.5 |
Financial Guarantee (HG Global) | BAM | Operating Segments |  |  |  |
Segment reporting information |  |  |  |
Earned insurance premiums |  |  | 2.8 | 5.2
Net investment income |  |  | 8.8 | 14.6
Interest income from BAM Surplus Notes |  |  | (13.2) | (26.2)
Unrealized loss on deconsolidation of BAM |  |  | 0.0 |
Commission and fee revenues |  |  | 0.0 | 0.0
Other revenues |  |  | 1.1 | 2.9
Total revenues |  |  | (5.6) | 9.5
Loss and loss adjustment expenses |  |  | 0.0 | 0.0
Acquisition expenses |  |  | 0.4 | 1.2
Cost of sales |  |  | 0.0 | 0.0
Broker commission expense |  |  | 0.0 |
General and administrative expenses |  |  | 33.5 | 66.1
Change in fair value of contingent consideration |  |  | 0.0 | 0.0
Interest expense |  |  | 0.0 | 0.0
Total expenses |  |  | 33.9 | 67.3
Pre-tax income (loss) |  |  | (39.5) | (57.8)
Financial Guarantee (HG Global) | BAM | Investments, Excluding MediaAlpha | Operating Segments |  |  |  |
Segment reporting information |  |  |  |
Net realized and unrealized investment gains (losses) |  |  | (5.1) | 13.0
Financial Guarantee (HG Global) | BAM | MediaAlpha | Operating Segments |  |  |  |
Segment reporting information |  |  |  |
Net realized and unrealized investment gains (losses) |  |  | 0.0 | 0.0
Change in fair value of BAM Surplus Notes |  |  | 0.0 |
Asset Management (Kudu) | Operating Segments |  |  |  |
Segment reporting information |  |  |  |
Earned insurance premiums |  | 0.0 | 0.0 | 0.0
Net investment income |  | 78.7 | 66.7 | 71.0
Net realized and unrealized investment gains (losses) |  | 103.5 | 51.3 | 106.1
Interest income from BAM Surplus Notes |  | 0.0 | 0.0 | 0.0
Change in fair value of BAM Surplus Notes |  | 0.0 |  |
Unrealized loss on deconsolidation of BAM |  |  | 0.0 |
Commission and fee revenues |  | 0.0 | 0.0 | 0.0
Net gain on sale of the Bamboo Group |  | 0.0 |  |
Other revenues |  | 1.2 | 0.8 | 0.0
Total revenues |  | 183.4 | 118.8 | 177.1
Loss and loss adjustment expenses |  | 0.0 | 0.0 | 0.0
Acquisition expenses |  | 0.0 | 0.0 | 0.0
Cost of sales |  | 0.0 | 0.0 | 0.0
Broker commission expense |  | 0.0 | 0.0 |
General and administrative expenses |  | 17.9 | 15.4 | 19.4
Change in fair value of contingent consideration |  | 0.0 | 0.0 | 0.0
Interest expense |  | 25.9 | 22.1 | 21.2
Total expenses |  | 43.8 | 37.5 | 40.6
Pre-tax income (loss) |  | 139.6 | 81.3 | 136.5
Asset Management (Kudu) | Investments, Excluding MediaAlpha | Operating Segments |  |  |  |
Segment reporting information |  |  |  |
Net realized and unrealized investment gains (losses) |  | 103.5 | 51.3 | 106.1
Asset Management (Kudu) | MediaAlpha | Operating Segments |  |  |  |
Segment reporting information |  |  |  |
Net realized and unrealized investment gains (losses) |  | 0.0 | 0.0 | 0.0
Change in fair value of BAM Surplus Notes |  |  | 0.0 |
P&C Insurance Distribution (Bamboo) | Operating Segments |  |  |  |
Segment reporting information |  |  |  |
Earned insurance premiums |  | 26.7 | 39.4 | 0.0
Net investment income |  | 2.6 | 2.2 |
Interest income from BAM Surplus Notes |  | 0.0 | 0.0 |
Change in fair value of BAM Surplus Notes |  | 0.0 |  |
Unrealized loss on deconsolidation of BAM |  |  | 0.0 |
Commission and fee revenues |  | 211.4 | 134.6 | 0.0
Net gain on sale of the Bamboo Group |  | 0.0 |  |
Other revenues |  | 5.0 | 3.6 |
Other revenues |  | 8.2 | 5.8 | 0.0
Total revenues |  | 246.3 | 179.8 |
Loss and loss adjustment expenses | $ 18.0 | 18.0 | 20.6 | 0.0
Acquisition expenses |  | 9.7 | 14.1 | 0.0
Cost of sales |  | 0.0 | 0.0 |
Broker commission expense |  | 72.0 | 51.3 | 0.0
General and administrative expenses |  | 96.8 | 61.1 | 0.0
Change in fair value of contingent consideration |  | 0.0 | 0.0 |
Interest expense |  | 9.7 | 0.0 | 0.0
Total expenses |  | 206.2 | 147.1 | 0.0
Pre-tax income (loss) |  | 40.1 | 32.7 |
Amortization of other intangibles |  | 12.0 | 16.4 |
Other intangible assets, finite-lived, accumulated amortization |  | 0.0 | 16.4 |
P&C Insurance Distribution (Bamboo) | Investments, Excluding MediaAlpha | Operating Segments |  |  |  |
Segment reporting information |  |  |  |
Net realized and unrealized investment gains (losses) |  | 0.6 | 0.0 |
P&C Insurance Distribution (Bamboo) | MediaAlpha | Operating Segments |  |  |  |
Segment reporting information |  |  |  |
Net realized and unrealized investment gains (losses) |  | 0.0 | 0.0 |
Change in fair value of BAM Surplus Notes |  |  | 0.0 |
Distinguished Partners | Operating Segments |  |  |  |
Segment reporting information |  |  |  |
Earned insurance premiums |  | 0.0 |  |
Net investment income |  | 1.0 |  |
Interest income from BAM Surplus Notes |  | 0.0 |  |
Change in fair value of BAM Surplus Notes |  | 0.0 |  |
Commission and fee revenues |  | 56.7 | 0.0 | 0.0
Net gain on sale of the Bamboo Group |  | 0.0 |  |
Other revenues |  | 0.0 |  |
Other revenues |  | 1.0 | 0.0 | 0.0
Total revenues |  | 57.7 |  |
Loss and loss adjustment expenses |  | 0.0 |  |
Acquisition expenses |  | 0.0 |  |
Cost of sales |  | 0.0 |  |
Broker commission expense |  | 22.1 | 0.0 | 0.0
General and administrative expenses |  | 47.0 | 0.0 | 0.0
Change in fair value of contingent consideration |  | 0.0 |  |
Interest expense |  | 5.1 | 0.0 | 0.0
Total expenses |  | 74.2 | 0.0 | $ 0.0
Pre-tax income (loss) |  | (16.5) |  |
Other intangible assets, finite-lived, accumulated amortization |  | 7.8 | $ 0.0 |
Distinguished Partners | Investments, Excluding MediaAlpha | Operating Segments |  |  |  |
Segment reporting information |  |  |  |
Net realized and unrealized investment gains (losses) |  | 0.0 |  |
Distinguished Partners | MediaAlpha | Operating Segments |  |  |  |
Segment reporting information |  |  |  |
Net realized and unrealized investment gains (losses) |  | $ 0.0 |  |

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