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Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 2023
Earnings Per Share [Abstract]  
Computation of earnings per share
The following table presents the Company’s computation of earnings per share from continuing operations for the three and six months ended June 30, 2023 and 2022. See Note 19 — “Held for Sale and Discontinued Operations.”
Three Months Ended June 30,Six Months Ended June 30,
 2023202220232022
Basic and diluted earnings per share numerators (in millions): 
Net income (loss) attributable to White Mountains’s common
   shareholders
$19.6 $(169.2)$199.1 $(135.8)
Less: total income (loss) from discontinued operations,
  net of tax (1)
 6.4  10.1 
Less: net (income) loss from discontinued operations
  attributable to noncontrolling interests
 (.5) (.6)
Net income (loss) from continuing operations attributable to
   White Mountains’s common shareholders
19.6 (175.1)199.1 (145.3)
Allocation of (earnings) losses to participating restricted
   common shares (2)
(.3)2.2 (2.7)1.6 
Basic and diluted earnings (losses) per share numerators $19.3 $(172.9)$196.4 $(143.7)
Basic earnings per share denominators (in thousands):
Total average common shares outstanding during the period2,562.4 2,979.0 2,566.1 2,992.5 
Average unvested restricted common shares (3)
(37.6)(38.3)(34.4)(33.9)
Basic earnings (losses) per share denominator2,524.8 2,940.7 2,531.7 2,958.6 
Diluted earnings per share denominator (in thousands):
Total average common shares outstanding during the period2,562.4 2,979.0 2,566.1 2,992.5 
Average unvested restricted common shares (3)
(37.6)(38.3)(34.4)(33.9)
Diluted earnings (losses) per share denominator2,524.8 2,940.7 2,531.7 2,958.6 
Basic and diluted earnings per share (in dollars) - continuing
  operations:
Distributed earnings - dividends declared and paid$ $— $1.00 $1.00 
Undistributed earnings (losses)7.65 (58.78)76.57 (49.57)
Basic and diluted earnings (losses) per share $7.65 $(58.78)$77.57 $(48.57)
(1) Includes net income (loss) from discontinued operations, net of tax - NSM Group. See Note 19 — “Held for Sale and Discontinued Operations.
(2) Restricted shares issued by White Mountains receive dividends, and therefore, are considered participating securities.
(3) Restricted shares outstanding vest upon a stated date. See Note 12 — “Employee Share-Based Incentive Compensation Plans.”
Schedule of Undistributed Net Earnings (Losses) from Continuing Operations
The following table presents the undistributed net earnings (losses) from continuing operations for the three and six months ended June 30, 2023 and 2022. See Note 19 — “Held for Sale and Discontinued Operations.”
Three Months Ended June 30,Six Months Ended June 30,
Millions2023202220232022
Undistributed net earnings - continuing operations:
Net income (loss) attributable to White Mountains’s common
   shareholders, net of restricted common share amounts
$19.3 $(172.9)$196.4 $(143.7)
Dividends declared, net of restricted common share amounts (1)
 — (2.5)(3.0)
Total undistributed net earnings (losses), net of restricted
   common share amounts
$19.3 $(172.9)$193.9 $(146.7)
(1) Restricted shares issued by White Mountains receive dividends, and therefore, are considered participating securities.