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Net Earnings (Loss) Per Common Share | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Net Earnings (Loss) Per Common Share | Net Earnings (Loss) 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 September 30, |  | Nine Months Ended September 30,
(In millions, except per share amounts) |  | 2018 |  | 2017 |  | 2018 |  | 2017
Basic Net Earnings (Loss) Per Common Share: |  |  |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |  |
Net earnings (loss) |  | $ | 79.0 |  |  | $ | 787.5 |  |  | $ | (7.2 | ) |  | $ | 848.4 |
Distributed and allocated undistributed net earnings to unvested restricted stockholders |  | (0.4 | ) |  | (5.0 | ) |  | (0.4 | ) |  | (5.3 | )
Distributed and allocated undistributed net earnings (loss) |  | 78.6 |  |  | 782.5 |  |  | (7.6 | ) |  | 843.1 |
Distributed net earnings - dividends paid to common stockholders |  | (25.0 | ) |  | (30.1 | ) |  | (76.9 | ) |  | (91.5 | )
Allocation of undistributed net earnings (loss) to common stockholders |  | $ | 53.6 |  |  | $ | 752.4 |  |  | $ | (84.5 | ) |  | $ | 751.6 |
Denominator: |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding - basic |  | 157.2 |  |  | 186.9 |  |  | 160.8 |  |  | 190.9 |
Basic net earnings per common share: |  |  |  |  |  |  |  |
Distributed net earnings |  | $ | 0.16 |  |  | $ | 0.16 |  |  | $ | 0.48 |  |  | $ | 0.48 |
Allocated undistributed net earnings (loss) to common stockholders |  | 0.34 |  |  | 4.03 |  |  | (0.53 | ) |  | 3.94 |
Basic net earnings (loss) per common share |  | $ | 0.50 |  |  | $ | 4.19 |  |  | $ | (0.05 | ) |  | $ | 4.42 |
Diluted Net Earnings (Loss) Per Common Share: |  |  |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |  |
Distributed and allocated undistributed net earnings (loss) |  | $ | 78.6 |  |  | $ | 782.5 |  |  | $ | (7.6 | ) |  | $ | 843.1 |
Add: Allocated undistributed net earnings to unvested restricted stockholders |  | 0.3 |  |  | 4.8 |  |  | — |  |  | 4.8 |
Less: Undistributed net earnings reallocated to unvested restricted stockholders |  | (0.3 | ) |  | (4.8 | ) |  | — |  |  | (4.8 | )
Net earnings (loss) available to common stockholders - diluted |  | $ | 78.6 |  |  | $ | 782.5 |  |  | $ | (7.6 | ) |  | $ | 843.1 |
Denominator: |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding - basic |  | 157.2 |  |  | 186.9 |  |  | 160.8 |  |  | 190.9 |
Effect of contingently issuable shares |  | 0.1 |  |  | 0.7 |  |  | — |  |  | 0.7 |
Effect of unvested restricted stock units |  | 0.3 |  |  | 0.7 |  |  | — |  |  | 0.7 |
Weighted average number of common shares outstanding - diluted under two-class |  | 157.6 |  |  | 188.3 |  |  | 160.8 |  |  | 192.3 |
Effect of unvested restricted stock - participating security |  | 0.4 |  |  | 0.6 |  |  | — |  |  | 0.6 |
Weighted average number of common shares outstanding - diluted under treasury stock |  | 158.0 |  |  | 188.9 |  |  | 160.8 |  |  | 192.9 |
Diluted net earnings (loss) per common share |  | $ | 0.50 |  |  | $ | 4.15 |  |  | $ | (0.05 | ) |  | $ | 4.37 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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