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Earnings Per Share - Basic and Diluted Earnings Per Share from Continuing Operations (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Basic and diluted earnings per share numerators (in millions): |  |
Net income (loss) attributable to White Mountains’s common shareholders | $ 236.4 | $ 179.5
Allocation of losses (earnings) to participating restricted common shares | (2.7) | (2.2)
Basic earnings (losses) per share numerators, Total | 233.7 | 177.3
Diluted earnings (losses) per share numerators, Total | $ 233.7 | $ 177.3
Basic earnings per share denominators (in thousands): |  |
Total average common shares outstanding during the period (in shares) | 2,559,700 | 2,569,900
Average unvested restricted common shares (in shares) | (28,600) | (31,100)
Basic earnings (losses) per share denominator (in shares) | 2,531,100 | 2,538,800
Diluted earnings per share denominator (in thousands): |  |
Total average common shares outstanding during the period (in shares) | 2,559,700 | 2,569,900
Average unvested restricted common shares (in shares) | (28,600) | (31,100)
Diluted earnings (losses) per share denominator (in shares) | 2,531,100 | 2,538,800
Basic and diluted earnings per share (in dollars): |  |
Distributed earnings - dividends declared and paid (in usd per share) | $ 1.00 | $ 1.00
Distributed earnings - dividends declared and paid (in usd per share) | 1.00 | 1.00
Undistributed earnings (losses) (in usd per share) | 91.33 | 68.83
Undistributed earnings (losses) (in usd per share) | 91.33 | 68.83
Basic and diluted earnings (losses) per share (in usd per share) | 92.33 | 69.83
Basic and diluted earnings (losses) per share (in usd per share) | $ 92.33 | $ 69.83

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