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Earnings Per Share Attributable to Quad Common Shareholders (Tables)
 12 Months Ended
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