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Held for Sale and Discontinued Operations (Tables) | 3 Months Ended
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Mar. 31, 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 months ended March 31, 2021 and 2020:
|  |  |  | Three Months Ended
|  |  |  | March 31,
|  |  |  |  |  | 2021 |  | 2020
Basic and diluted earnings per share numerators (in millions): |  |  |  |  |  |  |  |
Net loss attributable to White Mountains’s common shareholders |  |  |  |  |  | $ | (75.3) |  |  | $ | (128.8) |
Less: total loss from continuing operations, net of tax |  |  |  |  |  | (94.0) |  |  | (129.7) |
Net income from discontinued operations attributable to White Mountains’s common shareholders |  |  |  |  |  | $ | 18.7 |  |  | $ | .9 |
Allocation of earnings to participating restricted common shares (1) |  |  |  |  |  | (.2) |  |  | — |
Basic and diluted earnings per share numerators (2) |  |  |  |  |  | $ | 18.5 |  |  | $ | .9 |
Basic earnings per share denominators (in thousands): |  |  |  |  |  |  |  |
Total average common shares outstanding during the period |  |  |  |  |  | 3,100.2 |  |  | 3,178.0 |
Average unvested restricted common shares (3) |  |  |  |  |  | (32.4) |  |  | (33.8) |
Basic earnings per share denominator |  |  |  |  |  | 3,067.8 |  |  | 3,144.2 |
Diluted earnings per share denominator (in thousands): |  |  |  |  |  |  |  |
Total average common shares outstanding during the period |  |  |  |  |  | 3,100.2 |  |  | 3,178.0 |
Average unvested restricted common shares (3) |  |  |  |  |  | (32.4) |  |  | (33.8) |
Diluted earnings per share denominator |  |  |  |  |  | 3,067.8 |  |  | 3,144.2 |
Basic and diluted (losses) earnings per share (in dollars) - discontinued operations: |  |  |  |  |  | $ | 6.03 |  |  | $ | .28 |
(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 months ended March 31, 2021 and 2020. (3) Restricted common shares outstanding vest either in equal annual installments or upon a stated date. See Note 12 — “Employee Share-Based Incentive Compensation Plans”.

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- Definition Tabular disclosure of information related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3A -URI http://asc.fasb.org/extlink&oid=109226691&loc=SL51724579-110230 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109222650&loc=d3e1474-107760 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5D -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721677-107760 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109222160&loc=SL51721533-107759 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 3A -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721659-107760 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721665-107760 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5C -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721675-107760 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721683-107760 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109222650&loc=d3e1361-107760 Reference 11: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5A -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721671-107760 Reference 12: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760 Reference 13: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 4A -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721663-107760 + Details
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