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Held for Sale and Discontinued Operations - Earnings Per Share for Discontinued Operations (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Earnings Per Share [Abstract] |  |  |
Net income (loss) attributable to White Mountains’s common shareholders | $ 230.4 | $ 509.2 | $ 792.8
Less: net income (loss) from continuing operations | $ 284.1 | $ 580.9 | (190.8)
Less: net (income) loss from continuing operations attributable to noncontrolling interest |  |  | 81.1
Total income (loss) from discontinued operations attributable to White Mountains’s common shareholders |  |  | 902.5
Allocation of (earnings) losses to participating restricted common shares |  |  | (11.4)
Basic earnings (loss) per share numerators |  |  | 891.1
Diluted earnings (loss) per share numerators |  |  | $ 891.1
Basic earnings per share denominators (in thousands): |  |  |
Total average common shares outstanding during the period (in shares) | 2,565,700 | 2,563,300 | 2,862,400
Average unvested restricted common shares (in shares) | (33,500) | (36,000.0) | (36,200)
Basic earnings (losses) per share denominator (in shares) | 2,532,200 | 2,527,300 | 2,826,200
Diluted earnings per share denominator (in thousands): |  |  |
Total average common shares outstanding during the period (in shares) | 2,565,700 | 2,563,300 | 2,862,400
Average unvested restricted common shares (in shares) | (33,500) | (36,000.0) | (36,200)
Diluted earnings (loss) per share denominator (in shares) | 2,532,200 | 2,527,300 | 2,826,200
Basic (loss) earnings per share (in dollars) - discontinued operations (in dollars per share) | $ 0 | $ 0 | $ 315.30
Diluted (loss) earnings per share (in dollars) - discontinued operations (in dollars per share) | $ 0 | $ 0 | $ 315.30

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