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Net Earnings Per Common Share (Tables) | 9 Months Ended
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Sep. 30, 2021
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) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Basic Net Earnings Per Common Share: |  |  |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |  |
Net earnings |  | $ | 107.7 |  |  | $ | 134.0 |  |  | $ | 325.9 |  |  | $ | 360.7 |
Distributed and allocated undistributed net earnings to unvested restricted stockholders |  | — |  |  | — |  |  | — |  |  | (0.1) |
Net earnings available to common stockholders |  | $ | 107.7 |  |  | $ | 134.0 |  |  | $ | 325.9 |  |  | $ | 360.6 |
Denominator: |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding - basic |  | 149.9 |  |  | 155.5 |  |  | 151.8 |  |  | 155.2 |
Basic net earnings per common share: |  |  |  |  |  |  |  |
Basic net earnings per common share |  | $ | 0.72 |  |  | $ | 0.86 |  |  | $ | 2.15 |  |  | $ | 2.32 |
Diluted Net Earnings Per Common Share: |  |  |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |  |
Net earnings available to common stockholders |  | $ | 107.7 |  |  | $ | 134.0 |  |  | $ | 325.9 |  |  | $ | 360.6 |
Denominator: |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding - basic |  | 149.9 |  |  | 155.5 |  |  | 151.8 |  |  | 155.2 |
Effect of dilutive stock shares and units |  | 1.5 |  |  | 0.6 |  |  | 1.4 |  |  | 0.6 |
Weighted average number of common shares outstanding - diluted under treasury stock |  | 151.4 |  |  | 156.1 |  |  | 153.2 |  |  | 155.8 |
Diluted net earnings per common share |  | $ | 0.71 |  |  | $ | 0.86 |  |  | $ | 2.13 |  |  | $ | 2.31 |

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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 http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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