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Net Earnings Per Common Share (Tables) | 9 Months Ended
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Sep. 30, 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 September 30, |  | Nine Months Ended September 30,
(In millions, except per share amounts) |  | 2023 |  | 2022 |  | 2023 |  | 2022
Basic Net Earnings Per Common Share: |  |  |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |  |
Net earnings |  | $ | 56.6 |  |  | $ | 134.2 |  |  | $ | 217.6 |  |  | $ | 397.3 |
Distributed and allocated undistributed net earnings to unvested restricted stockholders |  | — |  |  | — |  |  | — |  |  | — |
Net earnings available to common stockholders |  | $ | 56.6 |  |  | $ | 134.2 |  |  | $ | 217.6 |  |  | $ | 397.3 |
Denominator: |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding - basic |  | 144.5 |  |  | 145.2 |  |  | 144.3 |  |  | 146.3 |
Basic net earnings per common share: |  |  |  |  |  |  |  |
Basic net earnings per common share |  | $ | 0.39 |  |  | $ | 0.92 |  |  | $ | 1.51 |  |  | $ | 2.72 |
Diluted Net Earnings Per Common Share: |  |  |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |  |
Net earnings available to common stockholders |  | $ | 56.6 |  |  | $ | 134.2 |  |  | $ | 217.6 |  |  | $ | 397.3 |
Denominator: |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding - basic |  | 144.5 |  |  | 145.2 |  |  | 144.3 |  |  | 146.3 |
Effect of dilutive stock shares and units |  | 0.4 |  |  | 1.4 |  |  | 0.5 |  |  | 1.5 |
Weighted average number of common shares outstanding - diluted under treasury stock |  | 144.9 |  |  | 146.6 |  |  | 144.8 |  |  | 147.8 |
Diluted net earnings per common share |  | $ | 0.39 |  |  | $ | 0.92 |  |  | $ | 1.50 |  |  | $ | 2.69 |

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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 -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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