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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Basic and diluted earnings per share numerators (in millions): |  |  |
Net income (loss) attributable to White Mountains’s common shareholders | $ 509.2 | $ 792.8 | $ (275.4)
Less: total income (loss) from discontinued operations, net of tax | 0.0 | 903.2 | (3.9)
Less: net (income) loss from discontinued operations attributable to noncontrolling interests | 0.0 | (0.7) | 1.0
Net income (loss) from continuing operations attributable to White Mountains’s common shareholders | 509.2 | (109.7) | (272.5)
Allocation of losses (earnings) to participating restricted common shares | (7.2) | 1.3 | 3.2
Basic earnings (losses) per share numerators | 502.0 | (108.4) | (269.3)
Diluted earnings (losses) per share numerators | $ 502.0 | $ (108.4) | $ (269.3)
Basic earnings per share denominators (in thousands): |  |  |
Total average common shares outstanding during the period (in shares) | 2,563,300 | 2,862,400 | 3,079,000
Average unvested restricted common shares (in shares) | (36,000.0) | (36,200) | (36,500)
Basic earnings (losses) per share denominator (in shares) | 2,527,300 | 2,826,200 | 3,042,500
Diluted earnings per share denominator (in thousands): |  |  |
Total average common shares outstanding during the period (in shares) | 2,563,300 | 2,862,400 | 3,079,000
Average unvested restricted common shares (in shares) | (36,000.0) | (36,200) | (36,500)
Diluted earnings (loss) per share denominator (in shares) | 2,527,300 | 2,826,200 | 3,042,500
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) | 197.60 | (39.34) | (89.52)
Undistributed earnings (losses) (in usd per share) | 197.60 | (39.34) | (89.52)
Continuing operations (usd per share) | 198.60 | (38.34) | (88.52)
Continuing operations (usd per share) | $ 198.60 | $ (38.34) | $ (88.52)

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