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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2020
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 nine months ended September 30, 2020 and 2019. See Note 17 — “Held for Sale and Discontinued Operations”.
|  | Three Months Ended |  | Nine Months Ended
|  | September 30 |  | September 30
|  | 2020 |  | 2019 |  | 2020 |  | 2019
Basic and diluted earnings per share numerators (in millions): |  |  |  |  |  |  |  |  |
Net income attributable to White Mountains’s common shareholders |  | $ | 232.9 |  |  | $ | 48.7 |  |  | $ | 219.5 |  |  | $ | 353.6 |
Less: total (loss) income from discontinued operations, net of tax |  | (.7 | ) |  | .9 |  |  | (.8 | ) |  | 1.6 |
Net income from continuing operations attributable to White Mountains’s common shareholders |  | $ | 233.6 |  |  | $ | 47.8 |  |  | $ | 220.3 |  |  | $ | 352.0 |
Allocation of earnings to participating restricted common shares(1) |  | (3.2 | ) |  | (.7 | ) |  | (2.9 | ) |  | (4.4 | )
Basic and diluted earnings per share numerators |  | $ | 230.4 |  |  | $ | 47.1 |  |  | $ | 217.4 |  |  | $ | 347.6 |
Basic earnings per share denominators (in thousands): |  |  |  |  |  |  |  |
Total average common shares outstanding during the period |  | 3,101.8 |  |  | 3,185.4 |  |  | 3,129.0 |  |  | 3,180.4 |
Average unvested restricted common shares(2) |  | (43.1 | ) |  | (43.4 | ) |  | (40.0 | ) |  | (39.6 | )
Basic earnings per share denominator |  | 3,058.7 |  |  | 3,142.0 |  |  | 3,089.0 |  |  | 3,140.8 |
Diluted earnings per share denominator (in thousands): |  |  |  |  |  |  |  |
Total average common shares outstanding during the period |  | 3,101.8 |  |  | 3,185.4 |  |  | 3,129.0 |  |  | 3,180.4 |
Average unvested restricted common shares(2) |  | (43.1 | ) |  | (43.4 | ) |  | (40.0 | ) |  | (39.6 | )
Diluted earnings per share denominator |  | 3,058.7 |  |  | 3,142.0 |  |  | 3,089.0 |  |  | 3,140.8 |
Basic and diluted earnings per share (in dollars) - continuing operations: |  |  |  |  |  |  |  |
Distributed earnings - dividends declared and paid |  | $ | — |  |  | $ | — |  |  | $ | 1.00 |  |  | $ | 1.00 |
Undistributed earnings |  | 75.32 |  |  | 15.01 |  |  | 69.40 |  |  | 109.67 |
Basic and diluted earnings per share |  | $ | 75.32 |  |  | $ | 15.01 |  |  | $ | 70.40 |  |  | $ | 110.67 |
(1) Restricted shares issued by White Mountains receive dividends, and therefore, are considered participating securities. (2) Restricted shares outstanding vest either in equal annual installments or upon a stated date. See Note 10 — “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 nine months ended September 30, 2020 and 2019. See Note 17 — “Held for Sale and Discontinued Operations”.
|  | Three Months Ended |  | Nine Months Ended
|  | September 30 |  | September 30
Millions |  | 2020 |  | 2019 |  | 2020 |  | 2019
Undistributed net earnings - continuing operations: |  |  |  |  |  |  |  |
Net income attributable to White Mountains’s common shareholders, net of restricted common share amounts |  | $ | 230.4 |  |  | $ | 47.1 |  |  | $ | 217.4 |  |  | $ | 347.6 |
Dividends declared, net of restricted common share amounts (1) |  | — |  |  | — |  |  | (3.1 | ) |  | (3.2 | )
Total undistributed net earnings, net of restricted common share amounts |  | $ | 230.4 |  |  | $ | 47.1 |  |  | $ | 214.3 |  |  | $ | 344.4 |
(1) Restricted shares issued by White Mountains receive dividends, and are therefore considered participating securities.

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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