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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
CONDENSED FINANCIAL INFORMATION OF THE REGISTRANT |  |  |
Revenues (loss) (including realized and unrealized gains and losses) | $ 2,239.8 | $ 2,166.7 | $ 1,157.9
Expenses | 1,923.1 | 1,601.3 | 1,307.3
Pre-tax income (loss) from continuing operations | 316.7 | 565.4 | (149.4)
Income tax (expense) benefit | (32.6) | 15.5 | (41.4)
Net income (loss) from continuing operations | 284.1 | 580.9 | (190.8)
Equity in earnings from discontinued operations, net of tax - NSM Group |  |  | 902.5
Net income (loss) attributable to White Mountains’s common shareholders | 230.4 | 509.2 | 792.8
Other comprehensive income (loss), net of tax | (0.1) | 2.4 | (3.8)
Other comprehensive income (loss) from discontinued operations, net of tax - NSM Group | 0.0 | 0.0 | (5.2)
Net gain (loss) from foreign currency translation from sale of discontinued operations, net of tax - NSM Group | 0.0 | 0.0 | (2.9)
Comprehensive income (loss) attributable to White Mountains’s common shareholders | 230.3 | 511.1 | 787.6
White Mountains Insurance Group Ltd. |  |  |
CONDENSED FINANCIAL INFORMATION OF THE REGISTRANT |  |  |
Revenues (loss) (including realized and unrealized gains and losses) | 50.7 | 81.7 | (0.4)
Expenses | 51.8 | 60.5 | 67.1
Pre-tax income (loss) from continuing operations | (1.1) | 21.2 | (67.5)
Income tax (expense) benefit | (0.8) | (1.2) | (0.9)
Net income (loss) from continuing operations | (1.9) | 20.0 | (68.4)
Equity in earnings (losses) from consolidated and unconsolidated subsidiaries, net of tax | 232.3 | 489.2 | (42.0)
Equity in earnings from discontinued operations, net of tax - NSM Group | 0.0 | 0.0 | 16.4
Net income (loss) attributable to White Mountains’s common shareholders | 230.4 | 509.2 | 792.8
Other comprehensive income (loss), net of tax | (0.1) | 1.9 | (2.9)
Other comprehensive income (loss) from discontinued operations, net of tax - NSM Group | 0.0 | 0.0 | (5.2)
Net gain (loss) from foreign currency translation from sale of discontinued operations, net of tax - NSM Group | 0.0 | 0.0 | 2.9
Comprehensive income (loss) attributable to White Mountains’s common shareholders | 230.3 | 511.1 | 787.6
NSM |  |  |
CONDENSED FINANCIAL INFORMATION OF THE REGISTRANT |  |  |
Net gain (loss) from sale of discontinued operations, net of tax - Sirius Group | 0.0 | 0.0 | 886.8
NSM | White Mountains Insurance Group Ltd. |  |  |
CONDENSED FINANCIAL INFORMATION OF THE REGISTRANT |  |  |
Net gain (loss) from sale of discontinued operations, net of tax - Sirius Group | $ 0.0 | $ 0.0 | $ 886.8

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