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Net Earnings (Loss) Per Common Share - Calculation of Basic and Diluted Net Earnings Per Common Share (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Numerator |  |  |  |
Net earnings available to common stockholders | $ 59.3 | $ 37.6 | $ 191.3 | $ 96.6
Distributed and allocated undistributed net earnings to non-vested restricted stockholders | (0.4) | (0.2) | (1.1) | (0.5)
Distributed and allocated undistributed net earnings to common stockholders | 58.9 | 37.4 | 190.2 | 96.1
Distributed net earnings - dividends paid to common stockholders | (27.4) | (25.3) | (82.9) | (75.9)
Allocation of undistributed net earnings to common stockholders | 31.5 | 12.1 | 107.3 | 20.2
Denominator |  |  |  |
Weighted average number of common shares outstanding - basic | 210.4 | 194.9 | 210.2 | 194.5
Basic net earnings per common share: |  |  |  |
Distributed net earnings to common stockholders | $ 0.13 | $ 0.13 | $ 0.39 | $ 0.39
Allocated undistributed net earnings to common stockholders | $ 0.15 | $ 0.06 | $ 0.52 | $ 0.10
Net earnings per common share - basic | $ 0.28 | $ 0.19 | $ 0.91 | $ 0.49
Numerator |  |  |  |
Distributed and allocated undistributed net earnings to common stockholders | 58.9 | 37.4 | 190.2 | 96.1
Add: Allocated undistributed net earnings to non-vested restricted stockholders | 0.2 | 0.1 | 0.6 | 0.1
Less: Undistributed net earnings reallocated to non-vested restricted stockholders | (0.2) | (0.1) | (0.6) | (0.1)
Net earnings available to common stockholders - diluted | $ 58.9 | $ 37.4 | $ 190.2 | $ 96.1
Denominator |  |  |  |
Weighted average number of common shares outstanding - basic | 210.4 | 194.9 | 210.2 | 194.5
Effect of assumed issuance of Settlement agreement shares |  | 18.0 | 2.2 | 18.0
Effect of contingently issuable shares | 1.9 | 1.6 | 1.8 | 1.5
Effect of non-vested restricted stock units | 1.2 | 0.8 | 1.1 | 0.9
Weighted average number of common shares outstanding - diluted | 213.5 | 215.3 | 215.3 | 214.9
Diluted net earnings per common share | $ 0.28 | $ 0.18 | $ 0.88 | $ 0.45

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