Cover Page - shares	9 Months Ended
	Sep. 30, 2020	Oct. 30, 2020
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2020
Document Transition Report	false
Entity File Number	001-34806
Entity Registrant Name	Quad/Graphics, Inc.
Entity Incorporation, State or Country Code	WI
Entity Tax Identification Number	39-1152983
Entity Address, Address Line One	N61 W23044 Harry’s Way
Entity Address, City or Town	Sussex
Entity Address, State or Province	WI
Entity Address, Postal Zip Code	53089-3995
City Area Code	414
Local Phone Number	566-6000
Title of 12(b) Security	Class A Common Stock, par value $0.025 per share
Trading Symbol	QUAD
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Central Index Key	0001481792
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Amendment Flag	false
Common Class A
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		40,099,652
Common Class B
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		13,556,858
Common Class C
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		0