Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

Name:	us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Anti-dilutive equity instruments (in shares)														0.5	0.7
Numerator:
Net earnings (loss) from continuing operations													$ (55.7)	$ 29.9	$ 118.1
Less: net loss attributable to noncontrolling interests													0.0	(0.6)	0.0
Net earnings (loss) from continuing operations attributable to Quad common shareholders													(55.7)	30.5	118.1
Loss from discontinued operations, net of tax													(100.6)	(22.0)	(10.9)
Net earnings (loss) attributable to Quad common shareholders													$ (156.3)	$ 8.5	$ 107.2
Denominator:
Basic weighted average number of common shares outstanding for all classes of common shares (in shares)													50.0	49.8	49.6
Plus: effect of dilutive equity incentive instruments (in shares)													0.0	1.8	2.2
Diluted weighted average number of common shares outstanding for all classes of common shares (in shares)													50.0	51.6	51.8
Earnings (loss) per share attributable to Quad/Graphics common shareholders:
Basic, continuing operations (in dollars per share)													$ (1.11)	$ 0.61	$ 2.38
Basic, discontinued operations (in dollars per share)													(2.01)	(0.44)	(0.22)
Basic (in dollars per share)													(3.12)	0.17	2.16
Diluted, continuing operations (in dollars per share)													(1.11)	0.59	2.28
Diluted, discontinued operations (in dollars per share)													(2.01)	(0.43)	(0.21)
Diluted (in dollars per share)													(3.12)	0.16	2.07
Cash dividends paid per common share for all classes of common shares (in dollars per share)	$ 0.15	$ 0.30	$ 0.30	$ 0.30	$ 0.30	$ 0.30	$ 0.30	$ 0.30	$ 0.30	$ 0.30	$ 0.30	$ 0.30	$ 1.05	$ 1.20	$ 1.20