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Net Earnings Per Common Share - Calculation of Basic and Diluted Net Earnings (Loss) Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Numerator |  |  |  |
Net earnings available to common stockholders | $ 86.6 | $ 60.8 | $ 211.9 | $ 191.8
Distributed and allocated undistributed net loss to non-vested restricted stockholders | (0.6) | (0.4) | (1.5) | (1.1)
Distributed and allocated undistributed net earnings to common stockholders | 86.0 | 60.4 | 210.4 | 190.7
Distributed net earnings - dividends paid to common stockholders | (26.1) | (27.3) | (80.6) | (82.9)
Allocation of undistributed net earnings to common stockholders | $ 59.9 | $ 33.1 | $ 129.8 | $ 107.8
Denominator |  |  |  |
Weighted average number of common shares outstanding - basic | 202.9 | 210.4 | 206.7 | 210.2
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 | 0.30 | 0.16 | 0.63 | 0.52
Basic net earnings per common share: | $ 0.43 | $ 0.29 | $ 1.02 | $ 0.91
Numerator |  |  |  |
Distributed and allocated undistributed net earnings to common stockholders | $ 86.0 | $ 60.4 | $ 210.4 | $ 190.7
Add: Allocated undistributed net earnings to unvested restricted stockholders | 0.5 | 0.1 | 1.0 | 0.6
Less: Undistributed net earnings (loss) reallocated to non-vested restricted stockholders | (0.5) | (0.1) | (1.0) | (0.6)
Net earnings available to common stockholders - diluted | $ 86.0 | $ 60.4 | $ 210.4 | $ 190.7
Denominator |  |  |  |
Weighted average number of common shares outstanding - basic | 202.9 | 210.4 | 206.7 | 210.2
Effect of assumed issuance of Settlement agreement shares |  |  |  | 2.2
Effect of contingently issuable shares | 1.4 | 1.9 | 1.3 | 1.8
Effect of unvested restricted stock units | 0.7 | 0.5 | 0.7 | 0.4
Weighted average number of common shares outstanding - diluted under two-class | 205.0 | 212.8 | 208.7 | 214.6
Effect of unvested restricted stock - participating security | 0.8 | 0.7 | 0.8 | 0.7
Weighted average number of common shares outstanding - diluted under treasury stock | 205.8 | 213.5 | 209.5 | 215.3
Diluted net earnings per common share | $ 0.42 | $ 0.28 | $ 1.01 | $ 0.89

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- Definition The total amount of dividends declared in the period for each class of stock and the contractual amount of dividends (or interest on participating income bonds) that must be paid for the period (for example, unpaid cumulative dividends). Dividends declared in the current period do not include dividends declared in respect of prior-period unpaid cumulative dividends. Preferred dividends that are cumulative only if earned are deducted only to the extent that they are earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60B -URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5780133-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60A -URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5780132-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e2740-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 66 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e2814-109256 + Details
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