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Net Earnings (Loss) per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2013
Earnings Per Share [Abstract] |
Calculation of Basic and Diluted Net Earnings (Loss) Per Common Share | The following table sets forth the calculation of basic and diluted net earnings (loss) per common share under the two-class method for the three years ended December 31, 2013 in millions, except per share data:
|  | 2013 |  |  | 2012 |  |  | 2011 |
Basic Net Earnings (Loss) Per Common Share: |  |  |  |  |  |  |  |  |  |  |  |
Numerator |  |  |  |  |  |  |  |  |  |  |  |
Net earnings (loss) available to common stockholders |  | $ | 124.2 |  |  | $ | (1,410.3 | ) |  | $ | 149.1 |
Distributed and allocated undistributed net earnings (loss) to non-vested restricted stockholders |  |  | (0.6 | ) |  |  | (0.5 | ) |  |  | (0.9 | )
Distributed and allocated undistributed net earnings (loss) to common stockholders |  |  | 123.6 |  |  |  | (1,410.8 | ) |  |  | 148.2 |
Distributed net earnings — dividends paid to common stockholders |  |  | (101.3 | ) |  |  | (100.4 | ) |  |  | (86.8 | )
Allocation of undistributed net earnings (loss) to common stockholders |  | $ | 22.3 |  |  | $ | (1,511.2 | ) |  | $ | 61.4 |
Denominator |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding — basic |  |  | 194.6 |  |  |  | 192.8 |  |  |  | 167.0 |
Basic net earnings (loss) per common share: |  |  |  |  |  |  |  |  |  |  |  |
Distributed net earnings (loss) to common stockholders |  | $ | 0.52 |  |  | $ | 0.52 |  |  | $ | 0.52 |
Allocated undistributed net earnings (loss) to common stockholders |  |  | 0.12 |  |  |  | (7.83 | ) |  |  | 0.37 |
Basic net earnings (loss) per common share: |  | $ | 0.64 |  |  | $ | (7.31 | ) |  | $ | 0.89 |
Diluted Net Earnings (Loss) Per Common Share: |  |  |  |  |  |  |  |  |  |  |  |
Numerator |  |  |  |  |  |  |  |  |  |  |  |
Distributed and allocated undistributed net earnings (loss) to common stockholders |  | $ | 123.6 |  |  | $ | (1,410.8 | ) |  | $ | 148.2 |
Add: Allocated undistributed net earnings (loss) to non-vested restricted stockholders |  |  | 0.1 |  |  |  | — |  |  |  | 0.4 |
Less: Undistributed net earnings (loss) reallocated to non-vested restricted stockholders |  |  | (0.1 | ) |  |  | — |  |  |  | (0.3 | )
Net earnings (loss) available to common stockholders — diluted |  | $ | 123.6 |  |  | $ | (1,410.8 | ) |  | $ | 148.3 |
Denominator(1) |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding — basic |  |  | 194.6 |  |  |  | 192.8 |  |  |  | 167.0 |
Effect of assumed issuance of Settlement agreement shares |  |  | 18.0 |  |  |  | — |  |  |  | 18.0 |
Effect of non-vested restricted stock units |  |  | 0.9 |  |  |  | — |  |  |  | 0.4 |
Weighted average number of common shares outstanding — diluted |  |  | 213.5 |  |  |  | 192.8 |  |  |  | 185.4 |
Diluted net earnings (loss) per common share |  | $ | 0.58 |  |  | $ | (7.31 | ) |  | $ | 0.80 |
(1) | Provides for the following items if their inclusion is dilutive: (i) the effect of assumed issuance of 18 million shares of common stock reserved for the Settlement agreement as defined and (ii) the effect of non-vested restricted stock and restricted stock units using the treasury stock method. In calculating diluted net (loss) earnings per common share for 2012, our diluted weighted average number of common shares outstanding excludes the effect of the items mentioned above as the effect was anti-dilutive.

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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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