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Net Earnings Per Common Share (Tables) | 3 Months Ended
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Mar. 31, 2020
Earnings Per Share [Abstract] |
Calculation of Basic and Diluted Net Earnings Per Common Share | The following table shows the calculation of basic and diluted net earnings per common share under the two-class method:
|  |  |  |  |  | Three Months Ended March 31, |  |
(In millions, except per share amounts) |  |  |  |  |  | 2020 |  | 2019
Basic Net Earnings Per Common Share: |  |  |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |  |
Net earnings |  |  |  |  |  | $ | 126.6 |  |  | $ | 57.5 |
Distributed and allocated undistributed net earnings to unvested restricted stockholders |  |  |  |  |  | (0.1) |  |  | (0.1) |
Distributed and allocated undistributed net earnings |  |  |  |  |  | 126.5 |  |  | 57.4 |
Distributed net earnings - dividends paid to common stockholders |  |  |  |  |  | (24.9) |  |  | (24.8) |
Allocation of undistributed net earnings to common stockholders |  |  |  |  |  | $ | 101.6 |  |  | $ | 32.6 |
Denominator: |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding - basic |  |  |  |  |  | 154.5 |  |  | 154.8 |
Basic net earnings per common share: |  |  |  |  |  |  |  |
Distributed net earnings |  |  |  |  |  | $ | 0.16 |  |  | $ | 0.16 |
Allocated undistributed net earnings to common stockholders |  |  |  |  |  | 0.66 |  |  | 0.21 |
Basic net earnings per common share |  |  |  |  |  | $ | 0.82 |  |  | $ | 0.37 |
Diluted Net Earnings Per Common Share: |  |  |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |  |
Distributed and allocated undistributed net earnings |  |  |  |  |  | $ | 126.5 |  |  | $ | 57.4 |
Add: Allocated undistributed net earnings to unvested restricted stockholders |  |  |  |  |  | 0.1 |  |  | 0.1 |
Less: Undistributed net earnings reallocated to unvested restricted stockholders |  |  |  |  |  | (0.1) |  |  | (0.1) |
Net earnings available to common stockholders - diluted |  |  |  |  |  | $ | 126.5 |  |  | $ | 57.4 |
Denominator: |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding - basic |  |  |  |  |  | 154.5 |  |  | 154.8 |
Effect of contingently issuable shares |  |  |  |  |  | 0.1 |  |  | 0.2 |
Effect of unvested restricted stock units |  |  |  |  |  | 0.2 |  |  | 0.2 |
Weighted average number of common shares outstanding - diluted under two-class |  |  |  |  |  | 154.8 |  |  | 155.2 |
Effect of unvested restricted stock - participating security |  |  |  |  |  | — |  |  | 0.2 |
Weighted average number of common shares outstanding - diluted under treasury stock |  |  |  |  |  | 154.8 |  |  | 155.4 |
Diluted net earnings per common share |  |  |  |  |  | $ | 0.82 |  |  | $ | 0.37 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + 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 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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