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Earnings Per Share Attributable to Quad Common Shareholders (Tables) | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Schedule of Calculation of Numerator and Denominator in Earnings Per Share | Reconciliations of the numerator and the denominator of the basic and diluted per share computations for the Company’s common stock for the years ended December 31, 2018, 2017 and 2016, are summarized as follows:
| 2018 |  | 2017 |  | 2016
Numerator: |  |  |  |  |
Net earnings attributable to Quad common shareholders | $ | 8.5 |  |  | $ | 107.2 |  |  | $ | 44.9 |
Denominator: |  |  |  |  |
Basic weighted average number of common shares outstanding for all classes of common shares | 49.8 |  |  | 49.6 |  |  | 47.9 |
Plus: effect of dilutive equity incentive instruments | 1.8 |  |  | 2.2 |  |  | 1.9 |
Diluted weighted average number of common shares outstanding for all classes of common shares | 51.6 |  |  | 51.8 |  |  | 49.8 |
Earnings per share attributable to Quad common shareholders: |  |  |  |  |
Basic | $ | 0.17 |  |  | $ | 2.16 |  |  | $ | 0.94 |
Diluted | $ | 0.16 |  |  | $ | 2.07 |  |  | $ | 0.90 |
Cash dividends paid per common share for all classes of common shares | $ | 1.20 |  |  | $ | 1.20 |  |  | $ | 1.20 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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