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Held for Sale and Discontinued Operations (Tables)
 9 Months Ended
Sep. 30, 2021
Discontinued Operations and Disposal Groups [Abstract]  
Schedule of Earnings Per Share for Discontinued Operations
The following table presents the Company’s computation of earnings per share for discontinued operations for the three and nine months ended September 30, 2021 and 2020:
Three Months EndedNine Months Ended
 September 30,September 30,
2021202020212020
Basic and diluted earnings per share numerators (in millions):
Net income (loss) attributable to White Mountains’s common shareholders$(371.4)$232.9 $(308.2)$219.5 
Less: total income (loss) from continuing operations, net of tax(371.4)233.6 (326.9)220.3 
Net (loss) gain from discontinued operations attributable to White Mountains’s common shareholders$— $(.7)$18.7 $(.8)
Allocation of earnings to participating restricted common shares (1)
— — (.2)— 
Basic and diluted earnings(losses) per share numerators (2)
$— $(.7)$18.5 $(.8)
Basic earnings per share denominators (in thousands): 
Total average common shares outstanding during the period3,090.3 3,101.8 3,099.4 3,129.0 
Average unvested restricted common shares (3)
(37.8)(43.1)(36.0)(40.0)
Basic earnings per share denominator3,052.5 3,058.7 3,063.4 3,089.0 
Diluted earnings per share denominator (in thousands): 
Total average common shares outstanding during the period3,090.3 3,101.8 3,099.4 3,129.0 
Average unvested restricted common shares (3)
(37.8)(43.1)(36.0)(40.0)
Diluted earnings per share denominator 3,052.5 3,058.7 3,063.4 3,089.0 
Basic and diluted earnings (losses) per share (in dollars) - discontinued operations:$— $(.23)$6.03 $(.26)
(1) Restricted shares issued by White Mountains contain dividend participation features, and therefore, are considered participating securities.
(2) Net earnings attributable to White Mountains’s common shareholders, net of restricted share amounts, is equal to undistributed earnings for the three and nine months ended September 30, 2021 and 2020.
(3) Restricted common shares outstanding vest upon a stated date. See Note 12 — “Employee Share-Based Incentive Compensation Plans”.