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Earnings Per Share - Schedule of Earnings Per Share from Continuing Operations (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Basic and diluted earnings per share numerators (in millions): |  |  |
Net income (loss) attributable to White Mountains’s common shareholders | $ 230.4 | $ 509.2 | $ 792.8
Less: total income (loss) from discontinued operations, net of tax | 0.0 | 0.0 | 903.2
Less: net (income) loss from discontinued operations attributable to noncontrolling interests | 0.0 | 0.0 | (0.7)
Net income (loss) from continuing operations attributable to White Mountains’s common shareholders | 230.4 | 509.2 | (109.7)
Allocation of (earnings) losses to participating restricted common shares | (3.0) | (7.2) | 1.3
Basic earnings (losses) per share numerators | 227.4 | 502.0 | (108.4)
Diluted earnings (losses) per share numerators | $ 227.4 | $ 502.0 | $ (108.4)
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 and diluted earnings per share (in dollars) - continuing operations: |  |  |
Distributed earnings - dividends declared and paid (in usd per share) | $ 1.00 | $ 1.00 | $ 1.00
Distributed earnings - dividends declared and paid (in usd per share) | 1.00 | 1.00 | 1.00
Undistributed earnings (losses) (in usd per share) | 88.79 | 197.60 | (39.34)
Undistributed earnings (losses) (in usd per share) | 88.79 | 197.60 | (39.34)
Basic and diluted earnings (losses) per share (in usd per share) | 89.79 | 198.60 | (38.34)
Basic and diluted earnings (losses) per share (in usd per share) | $ 89.79 | $ 198.60 | $ (38.34)

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