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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Numerator |  |  |  |
Net earnings available to common stockholders | $ 60.3 | $ 56.3 | $ 132.1 | $ 59.0
Distributed and allocated undistributed net earnings to non-vested restricted stockholders | (0.3) | (0.2) | (0.7) | (0.3)
Distributed and allocated undistributed net earnings to common stockholders | 60.0 | 56.1 | 131.4 | 58.7
Distributed net earnings - dividends paid to common stockholders | (27.9) | (25.3) | (55.6) | (50.6)
Allocation of undistributed net earnings to common stockholders | 32.1 | 30.8 | 75.8 | 8.1
Denominator |  |  |  |
Weighted average number of common shares outstanding - basic | 213.5 | 194.8 | 210.1 | 194.3
Basic net earnings per common share: |  |  |  |
Distributed net earnings to common stockholders | $ 0.13 | $ 0.13 | $ 0.26 | $ 0.26
Allocated undistributed net earnings (loss) to common stockholders | $ 0.15 | $ 0.16 | $ 0.37 | $ 0.04
Net earnings per common share-basic | $ 0.28 | $ 0.29 | $ 0.63 | $ 0.30
Numerator |  |  |  |
Distributed and allocated undistributed net earnings to common stockholders | 60.0 | 56.1 | 131.4 | 58.7
Add: Allocated undistributed net earnings to non-vested restricted stockholders | 0.2 | 0.1 | 0.5 | 0.1
Less: Undistributed net earnings reallocated to non-vested restricted stockholders | (0.2) | (0.1) | (0.5) | (0.1)
Net earnings available to common stockholders - diluted | $ 60.0 | $ 56.1 | $ 131.4 | $ 58.7
Denominator |  |  |  |
Weighted average number of common shares outstanding - basic | 213.5 | 194.8 | 210.1 | 194.3
Effect of assumed issuance of Settlement agreement shares |  | 18.0 | 3.3 | 18.0
Effect of non-vested restricted stock units | 1.2 | 0.8 | 1.2 | 0.9
Weighted average number of common shares outstanding - diluted | 214.7 | 213.6 | 214.6 | 213.2
Diluted net earnings per common share | $ 0.28 | $ 0.26 | $ 0.61 | $ 0.28

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