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Net Earnings (Loss) per Common Share - Calculation of Basic and Diluted Net Earnings (Loss) Per Common Share (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
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
Net earnings (loss) per common share - basic | $ 0.64 | $ (7.31) | $ 0.89
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
Weighted average number of common shares outstanding: |  |  |
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

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