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Net Earnings (Loss) Per Common Share (Tables) | 6 Months Ended
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Jun. 30, 2019
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 (loss) per common share under the two-class method:
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
(In millions, except per share amounts) |  | 2019 |  | 2018 |  | 2019 |  | 2018
Basic Net Earnings (Loss) Per Common Share: |  |  |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |  |
Net earnings (loss) |  | $ | 33.2 |  |  | $ | 114.4 |  |  | $ | 90.7 |  |  | $ | (86.2 | )
Distributed and allocated undistributed net earnings to unvested restricted stockholders |  | (0.1 | ) |  | (0.6 | ) |  | (0.2 | ) |  | (0.3 | )
Distributed and allocated undistributed net earnings (loss) |  | 33.1 |  |  | 113.8 |  |  | 90.5 |  |  | (86.5 | )
Distributed net earnings - dividends paid to common stockholders |  | (24.6 | ) |  | (25.5 | ) |  | (49.4 | ) |  | (51.9 | )
Allocation of undistributed net earnings (loss) to common stockholders |  | $ | 8.5 |  |  | $ | 88.3 |  |  | $ | 41.1 |  |  | $ | (138.4 | )
Denominator: |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding - basic |  | 154.5 |  |  | 159.7 |  |  | 154.6 |  |  | 162.5 |
Basic net earnings per common share: |  |  |  |  |  |  |  |
Distributed net earnings |  | $ | 0.16 |  |  | $ | 0.16 |  |  | $ | 0.32 |  |  | $ | 0.32 |
Allocated undistributed net earnings (loss) to common stockholders |  | 0.06 |  |  | 0.55 |  |  | 0.27 |  |  | (0.85 | )
Basic net earnings (loss) per common share |  | $ | 0.22 |  |  | $ | 0.71 |  |  | $ | 0.59 |  |  | $ | (0.53 | )
Diluted Net Earnings (Loss) Per Common Share: |  |  |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |  |
Distributed and allocated undistributed net earnings (loss) |  | $ | 33.1 |  |  | $ | 113.8 |  |  | $ | 90.5 |  |  | $ | (86.5 | )
Add: Allocated undistributed net earnings to unvested restricted stockholders |  | — |  |  | 0.4 |  |  | 0.1 |  |  | — |
Less: Undistributed net earnings reallocated to unvested restricted stockholders |  | — |  |  | (0.4 | ) |  | (0.1 | ) |  | — |
Net earnings (loss) available to common stockholders - diluted |  | $ | 33.1 |  |  | $ | 113.8 |  |  | $ | 90.5 |  |  | $ | (86.5 | )
Denominator: |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding - basic |  | 154.5 |  |  | 159.7 |  |  | 154.6 |  |  | 162.5 |
Effect of contingently issuable shares |  | 0.3 |  |  | 0.1 |  |  | 0.2 |  |  | — |
Effect of unvested restricted stock units |  | 0.2 |  |  | 0.4 |  |  | 0.2 |  |  | — |
Weighted average number of common shares outstanding - diluted under two-class |  | 155.0 |  |  | 160.2 |  |  | 155.0 |  |  | 162.5 |
Effect of unvested restricted stock - participating security |  | 0.3 |  |  | 0.4 |  |  | 0.3 |  |  | — |
Weighted average number of common shares outstanding - diluted under treasury stock |  | 155.3 |  |  | 160.6 |  |  | 155.3 |  |  | 162.5 |
Diluted net earnings (loss) per common share |  | $ | 0.21 |  |  | $ | 0.71 |  |  | $ | 0.58 |  |  | $ | (0.53 | )

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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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