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Net Earnings per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Calculation of Basic and Diluted Net Earnings Per Common Share | The following table sets forth the calculation of basic and diluted net earnings per common share under the two-class method for the years ended December 31:
|  | Year Ended December 31,
(In millions, except per share amounts) |  | 2018 |  | 2017 |  | 2016
Basic Net Earnings Per Common Share: |  |  |  |  |  |
Numerator |  |  |  |  |  |
Net earnings |  | $ | 193.1 |  |  | $ | 814.9 |  |  | $ | 486.4 |
Distributed and allocated undistributed net earnings to unvested restricted stockholders |  | (0.9 | ) |  | (4.9 | ) |  | (3.4 | )
Distributed and allocated undistributed net earnings |  | 192.2 |  |  | 810.0 |  |  | 483.0 |
Distributed net earnings - dividends paid to common stockholders |  | (101.7 | ) |  | (118.7 | ) |  | (118.7 | )
Allocation of undistributed net earnings to common stockholders |  | $ | 90.5 |  |  | $ | 691.3 |  |  | $ | 364.3 |
Denominator |  |  |  |  |  |
Weighted average number of common shares outstanding - basic |  | 159.4 |  |  | 186.9 |  |  | 194.3 |
Basic net earnings per common share: |  |  |  |  |  |
Distributed net earnings |  | $ | 0.64 |  |  | $ | 0.64 |  |  | $ | 0.61 |
Allocated undistributed net earnings to common stockholders |  | 0.57 |  |  | 3.69 |  |  | 1.88 |
Basic net earnings per common share |  | $ | 1.21 |  |  | $ | 4.33 |  |  | $ | 2.49 |
Diluted Net Earnings Per Common Share: |  |  |  |  |  |
Numerator |  |  |  |  |  |
Distributed and allocated undistributed net earnings to common stockholders |  | $ | 192.2 |  |  | $ | 810.0 |  |  | $ | 483.0 |
Add: Allocated undistributed net earnings to unvested restricted stockholders |  | 0.5 |  |  | 4.3 |  |  | 2.6 |
Less: Undistributed net earnings reallocated to unvested restricted stockholders |  | (0.5 | ) |  | (4.3 | ) |  | (2.6 | )
Net earnings available to common stockholders - diluted |  | $ | 192.2 |  |  | $ | 810.0 |  |  | $ | 483.0 |
Denominator |  |  |  |  |  |
Weighted average number of common shares outstanding - basic |  | 159.4 |  |  | 186.9 |  |  | 194.3 |
Effect of contingently issuable shares |  | 0.1 |  |  | 0.7 |  |  | 1.2 |
Effect of unvested restricted stock units |  | 0.3 |  |  | 0.7 |  |  | 0.7 |
Weighted average number of common shares outstanding - diluted under two-class |  | 159.8 |  |  | 188.3 |  |  | 196.2 |
Effect of unvested restricted stock - participating security |  | 0.4 |  |  | 0.6 |  |  | 1.0 |
Weighted average number of common shares outstanding - diluted under treasury stock |  | 160.2 |  |  | 188.9 |  |  | 197.2 |
Diluted net earnings per common share |  | $ | 1.20 |  |  | $ | 4.29 |  |  | $ | 2.46 |

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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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