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Net (Loss) Earnings - Per Common Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Numerator |  |  |  |
Net (loss) earnings available to common stockholders | $ (13.7) | $ 65.0 | $ (19.6) | $ 124.7
Distributed and allocated undistributed net earnings to non-vested restricted stockholders | (0.1) | (0.4) | (0.2) | (0.8)
Distributed and allocated undistributed net (loss) earnings -to common stockholders | (13.8) | 64.6 | (19.8) | 123.9
Distributed net earnings-dividends paid to common stockholders | (25.1) | (20.7) | (50.2) | (41.4)
Allocation of undistributed net (loss) earnings to common stockholders | (38.9) | 43.9 | (70.0) | 82.5
Denominator (1) |  |  |  |
Weighted average number of common shares outstanding-basic | 193.0 | 159.2 | 192.4 | 159.0
Basic net (loss) earnings per common share: |  |  |  |
Distributed net earnings to common stockholders | $ 0.13 | $ 0.13 | $ 0.26 | $ 0.26
Allocated undistributed net (loss) earnings to common stockholders | $ (0.20) | $ 0.28 | $ (0.36) | $ 0.52
Basic net (loss) earnings per common share: | $ (0.07) | $ 0.41 | $ (0.10) | $ 0.78
Numerator |  |  |  |
Distributed and allocated undistributed net (loss) earnings to common stockholders | (13.8) | 64.6 | (19.8) | 123.9
Add: Allocated undistributed net earnings to non-vested restricted stockholders |  | 0.3 |  | 0.5
Less: Undistributed net earnings reallocated to non-vested restricted stockholders |  | (0.3) |  | (0.5)
Net (loss) earnings available to common stockholders - diluted | $ (13.8) | $ 64.6 | $ (19.8) | $ 123.9
Denominator (1) (2) |  |  |  |
Weighted average number of common shares outstanding-basic | 193.0 | 159.2 | 192.4 | 159.0
Effect of assumed issuance of Settlement agreement shares |  | 18.0 |  | 18.0
Effect of non-vested restricted stock and restricted stock units |  | 0.3 |  | 0.2
Weighted average number of common shares outstanding-diluted | 193.0 | 177.5 | 192.4 | 177.2
Diluted net (loss) earnings per common share | $ (0.07) | $ 0.37 | $ (0.10) | $ 0.70

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