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Net Earnings per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2022
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:
|  | Year Ended December 31,
(In millions, except per share amounts) |  | 2022 |  | 2021 |  | 2020
Basic Net Earnings Per Common Share: |  |  |  |  |  |
Numerator: |  |  |  |  |  |
Net earnings |  | $ | 491.6 |  |  | $ | 506.8 |  |  | $ | 502.9 |
Distributed and allocated undistributed net earnings to unvested restricted stockholders |  | — |  |  | — |  |  | (0.2) |
Net earnings available to common stockholders |  | $ | 491.6 |  |  | $ | 506.8 |  |  | $ | 502.7 |
Denominator: |  |  |  |  |  |
Weighted average number of common shares outstanding - basic |  | 145.9 |  |  | 150.9 |  |  | 155.2 |
Basic net earnings per common share: |  |  |  |  |  |
Basic net earnings per common share |  | $ | 3.37 |  |  | $ | 3.36 |  |  | $ | 3.24 |
Diluted Net Earnings Per Common Share: |  |  |  |  |  |
Numerator: |  |  |  |  |  |
Net earnings available to common stockholders |  | $ | 491.6 |  |  | $ | 506.8 |  |  | $ | 502.7 |
Denominator: |  |  |  |  |  |
Weighted average number of common shares outstanding - basic |  | 145.9 |  |  | 150.9 |  |  | 155.2 |
Effect of dilutive stock shares and units |  | 1.5 |  |  | 1.5 |  |  | 0.8 |
Weighted average number of common shares outstanding - diluted under treasury stock |  | 147.4 |  |  | 152.4 |  |  | 156.0 |
Diluted net earnings per common share |  | $ | 3.33 |  |  | $ | 3.32 |  |  | $ | 3.22 |

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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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