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Earnings Per Share Attributable to Quad Common Shareholders (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Earnings Per Share [Abstract]                              
Anti-dilutive equity instruments (in shares)                         0.5 0.7 1.9
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 (in shares)                         49.8 49.6 47.9
Plus: effect of dilutive equity incentive instruments (in shares)                         1.8 2.2 1.9
Diluted weighted average number of common shares outstanding for all classes of common shares (in shares)                         51.6 51.8 49.8
Earnings (loss) per share attributable to Quad/Graphics common shareholders:                              
Basic (in dollars per share)                         $ 0.17 $ 2.16 $ 0.94
Diluted (in dollars per share)                         0.16 2.07 0.90
Cash dividends paid per common share for all classes of common shares (in dollars per share) $ 0.30 $ 0.30 $ 0.30 $ 0.30 $ 0.30 $ 0.30 $ 0.30 $ 0.30 $ 0.30 $ 0.30 $ 0.30 $ 0.30 $ 1.20 $ 1.20 $ 1.20