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Net Earnings Per Common Share (Tables) | 3 Months Ended
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Mar. 31, 2023
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:
|  |  |  | Three Months Ended March 31,
(In millions, except per share amounts) |  |  |  |  |  | 2023 |  | 2022
Basic Net Earnings Per Common Share: |  |  |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |  |
Net earnings |  |  |  |  |  | $ | 61.9 |  |  | $ | 149.2 |
Distributed and allocated undistributed net earnings to unvested restricted stockholders |  |  |  |  |  | — |  |  | — |
Net earnings available to common stockholders |  |  |  |  |  | $ | 61.9 |  |  | $ | 149.2 |
Denominator: |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding - basic |  |  |  |  |  | 144.1 |  |  | 147.6 |
Basic net earnings per common share: |  |  |  |  |  |  |  |
Basic net earnings per common share |  |  |  |  |  | $ | 0.43 |  |  | $ | 1.01 |
Diluted Net Earnings Per Common Share: |  |  |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |  |
Net earnings available to common stockholders |  |  |  |  |  | $ | 61.9 |  |  | $ | 149.2 |
Denominator: |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding - basic |  |  |  |  |  | 144.1 |  |  | 147.6 |
Effect of dilutive stock shares and units |  |  |  |  |  | 0.7 |  |  | 1.9 |
Weighted average number of common shares outstanding - diluted under treasury stock |  |  |  |  |  | 144.8 |  |  | 149.5 |
Diluted net earnings per common share |  |  |  |  |  | $ | 0.43 |  |  | $ | 1.00 |

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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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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