Condensed Consolidated Statements of Shareholders' Equity and Noncontrolling Interests - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Common Stock Cumulative Effect, Period Of Adoption, Adjusted Balance	Additional Paid-in Capital	Additional Paid-in Capital Cumulative Effect, Period Of Adoption, Adjusted Balance	Treasury Stock	Treasury Stock Cumulative Effect, Period Of Adoption, Adjusted Balance	Accumulated Deficit	Accumulated Deficit Cumulative Effect, Period Of Adoption, Adjustment	Accumulated Deficit Cumulative Effect, Period Of Adoption, Adjusted Balance	Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss Cumulative Effect, Period Of Adoption, Adjusted Balance	Quad’s Shareholders’ Equity	Quad’s Shareholders’ Equity Cumulative Effect, Period Of Adoption, Adjustment	Quad’s Shareholders’ Equity Cumulative Effect, Period Of Adoption, Adjusted Balance	Noncontrolling Interests	Noncontrolling Interests Cumulative Effect, Period Of Adoption, Adjusted Balance
Beginning balance, shares at Dec. 31, 2019		54.3	54.3			(1.6)	(1.6)
Beginning balance, Quad's shareholders equity at Dec. 31, 2019		$ 1.4	$ 1.4	$ 847.4	$ 847.4	$ (31.5)	$ (31.5)	$ (423.5)	$ (6.3)	$ (429.8)	$ (167.2)	$ (167.2)	$ 226.6	$ (6.3)	$ 220.3
Beginning balance, noncontrolling interests at Dec. 31, 2019																$ 17.7	$ 17.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss) attributable to Quad common shareholders	$ (12.4)							(12.4)					(12.4)
Less: net earnings (loss) attributable to noncontrolling interests	0.0															0.0
Change in ownership of noncontrolling interests																0.1
Foreign currency translation adjustments											(15.3)		(15.3)
Interest rate swap adjustments, net of tax											(8.3)		(8.3)
Cash dividends declared								(7.9)					(7.9)
Stock-based compensation				3.1									3.1
Issuance of share-based awards, net of other activity, shares		0.1				1.1
Issuance of share-based awards, net of other activity				19.8		$ (19.8)							0.0
Awards redeemed to pay employees' tax obligations, shares						(0.2)
Awards redeemed to pay employees’ tax obligations						$ (1.0)							(1.0)
Ending balance, shares at Mar. 31, 2020		54.4				(0.7)
Ending balance, Quad's shareholders' equity at Mar. 31, 2020		$ 1.4		830.7		$ (12.7)		(450.1)			(190.8)		178.5
Ending balance, noncontrolling interests at Mar. 31, 2020																17.8
Beginning balance, shares at Dec. 31, 2020		54.4				(0.8)
Beginning balance, Quad's shareholders equity at Dec. 31, 2020	84.1	$ 1.4		833.1		$ (13.1)		(566.0)			(171.3)		84.1
Beginning balance, noncontrolling interests at Dec. 31, 2020	0.7															0.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss) attributable to Quad common shareholders	10.2							10.2					10.2
Less: net earnings (loss) attributable to noncontrolling interests	0.0
Foreign currency translation adjustments											(6.0)		(6.0)
Interest rate swap adjustments, net of tax											1.8		1.8
Stock-based compensation				3.0									3.0
Issuance of share-based awards, net of other activity, shares		1.3				0.0
Issuance of share-based awards, net of other activity				0.6		$ (1.0)							(0.4)
Awards redeemed to pay employees' tax obligations, shares						(0.2)
Awards redeemed to pay employees’ tax obligations						$ (1.1)							(1.1)
Ending balance, shares at Mar. 31, 2021		55.7				(1.0)
Ending balance, Quad's shareholders' equity at Mar. 31, 2021	92.4	$ 1.4		$ 835.5		$ (13.2)		$ (555.8)			$ (175.5)		$ 92.4
Ending balance, noncontrolling interests at Mar. 31, 2021	$ 0.7															$ 0.7