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SCHEDULE II - CONDENSED FINANCIAL INFORMATION OF THE REGISTRANT - CONDENSED BALANCE SHEETS (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Assets |  |
Common equity securities, at fair value | $ 483.0 | $ 650.0
Other long-term investments | 2,958.5 | 2,150.2
Total assets | 12,306.5 | 9,925.6
Liabilities |  |
Total liabilities | 6,051.4 | 4,794.6
Total White Mountains’s common shareholders’ equity | 5,425.4 | 4,483.7
Total liabilities, redeemable noncontrolling interests and equity | 12,306.5 | 9,925.6
White Mountains Insurance Group Ltd. |  |
Assets |  |
Cash | 0.4 | 0.1
Fixed maturity investments, at fair value | 35.3 | 70.0
Common equity securities, at fair value | 11.7 | 234.7
Short-term investments, at fair value | 55.1 | 62.4
Other long-term investments | 50.1 | 74.0
Net receivable due from subsidiaries | 0.0 | 118.3
Other assets | 5.3 | 4.6
Investments in consolidated and unconsolidated subsidiaries | 5,330.6 | 3,943.9
Net assets held for sale | 1.4 | 0.6
Total assets | 5,489.9 | 4,508.6
Liabilities |  |
Net payable due to subsidiaries | 32.4 | 0.0
Other liabilities | 32.1 | 24.9
Total liabilities | 64.5 | 24.9
Total White Mountains’s common shareholders’ equity | 5,425.4 | 4,483.7
Total liabilities, redeemable noncontrolling interests and equity | $ 5,489.9 | $ 4,508.6

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