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SCHEDULE II - CONDENSED FINANCIAL INFORMATION OF THE REGISTRANT - CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
CONDENSED FINANCIAL INFORMATION OF THE REGISTRANT |  |  |
Revenues (including realized and unrealized gains and losses) | $ 3,735.0 | $ 2,239.8 | $ 2,166.7
Expenses | 2,406.3 | 1,923.1 | 1,601.3
Pre-tax income (loss) | 1,328.7 | 316.7 | 565.4
Income tax (expense) benefit | (126.9) | (32.6) | 15.5
Net income (loss) attributable to White Mountains’s common shareholders | 1,106.4 | 230.4 | 509.2
White Mountains Insurance Group Ltd. |  |  |
CONDENSED FINANCIAL INFORMATION OF THE REGISTRANT |  |  |
Revenues (including realized and unrealized gains and losses) | 28.9 | 50.7 | 81.7
Expenses | 81.6 | 51.8 | 60.5
Pre-tax income (loss) | (52.7) | (1.1) | 21.2
Income tax (expense) benefit | (0.2) | (0.8) | (1.2)
Net income (loss) | (52.9) | (1.9) | 20.0
Equity in earnings (losses) from consolidated and unconsolidated subsidiaries, net of tax | 1,159.3 | 232.3 | 489.2
Net income (loss) attributable to White Mountains’s common shareholders | 1,106.4 | 230.4 | 509.2
Equity in other comprehensive income (loss) from consolidated and unconsolidated subsidiaries, net of tax | 2.5 | (0.1) | 1.9
Comprehensive income (loss) attributable to White Mountains’s common shareholders | $ 1,108.9 | $ 230.3 | $ 511.1

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