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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 | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Numerator |  |
Net earnings (loss) available to common stockholders | $ 2.7 | $ (6.0)
Distributed and allocated undistributed net earnings (loss) to non-vested restricted stockholders | (0.1) | (0.1)
Distributed and allocated undistributed net earnings (loss) to common stockholders | 2.6 | (6.1)
Distributed net earnings (loss) - dividends paid to common stockholders | (25.3) | (25.1)
Allocation of undistributed net earnings (loss) to common stockholders | (22.7) | (31.2)
Denominator |  |
Weighted average number of common shares outstanding - basic | 193.8 | 191.9
Basic net earnings (loss) per common share: |  |
Distributed net earnings (loss) to common stockholders | $ 0.13 | $ 0.13
Allocated undistributed net earnings (loss) to common stockholders | $ (0.12) | $ (0.16)
Net earnings (loss) per common share-basic | $ 0.01 | $ (0.03)
Numerator |  |
Distributed and allocated undistributed net earnings (loss) to common stockholders | 2.6 | (6.1)
Add: Allocated undistributed net earnings (loss) to non-vested restricted stockholders |  |
Less: Undistributed net earnings (loss) reallocated to non-vested restricted stockholders |  |
Net earnings (loss) available to common stockholders - diluted | $ 2.6 | $ (6.1)
Denominator |  |
Weighted average number of common shares outstanding - basic | 193.8 | 191.9
Effect of assumed issuance of Settlement agreement shares | 18.0 |
Effect of non-vested restricted stock units | 0.9 |
Weighted average number of common shares outstanding - diluted | 212.7 | 191.9
Diluted net earnings (loss) per common share | $ 0.01 | $ (0.03)

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- Definition The amount resulting from the "as if" assumption that stock options or restrictive stock units were exercised for purposes of computing the dilutive effect of convertible securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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