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Net Loss Per Common Share (Tables) | 3 Months Ended
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Mar. 31, 2018
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 loss per common share under the two-class method:
|  | Three Months Ended March 31,
(In millions, except per share amounts) |  | 2018 |  | 2017
Basic Net Loss Per Common Share: |  |  |  |
Numerator |  |  |  |
Net loss |  | $ | (200.6 | ) |  | $ | (43.2 | )
Distributed and allocated undistributed net (loss) earnings to non-vested restricted stockholders |  | (0.2 | ) |  | 0.1 |
Distributed and allocated undistributed net loss |  | (200.8 | ) |  | (43.1 | )
Distributed net loss - dividends paid |  | (26.3 | ) |  | (31.0 | )
Allocation of undistributed net loss to common stockholders |  | $ | (227.1 | ) |  | $ | (74.1 | )
Denominator |  |  |  |
Weighted average number of common shares outstanding - basic |  | 165.3 |  |  | 193.4 |
Basic net earnings per common share: |  |  |  |
Distributed net earnings |  | $ | 0.16 |  |  | $ | 0.16 |
Allocated undistributed net loss to common stockholders |  | (1.37 | ) |  | (0.38 | )
Basic net loss per common share |  | $ | (1.21 | ) |  | $ | (0.22 | )
Diluted Net Loss Per Common Share: |  |  |  |
Numerator |  |  |  |
Distributed and allocated undistributed net loss |  | $ | (200.8 | ) |  | $ | (43.1 | )
Add: Allocated undistributed net earnings to unvested restricted stockholders |  | — |  |  | — |
Less: Undistributed net earnings reallocated to non-vested restricted stockholders |  | — |  |  | — |
Net loss available to common stockholders - diluted |  | $ | (200.8 | ) |  | $ | (43.1 | )
Denominator |  |  |  |
Weighted average number of common shares outstanding - basic |  | 165.3 |  |  | 193.4 |
Effect of contingently issuable shares |  | — |  |  | 0.8 |
Effect of unvested restricted stock units |  | — |  |  | 0.9 |
Weighted average number of common shares outstanding - diluted under two-class |  | 165.3 |  |  | 195.1 |
Effect of unvested restricted stock - participating security |  | — |  |  | 0.6 |
Weighted average number of common shares outstanding - diluted under treasury stock |  | 165.3 |  |  | 195.7 |
Diluted net loss per common share |  | $ | (1.21 | ) |  | $ | (0.22 | )

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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/2003/role/presentationRef -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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