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Acquisitions and Strategic Investments (Narrative) (Details) - Rise Interactive - USD ($)
$ in Millions
Apr. 30, 2021
Jun. 15, 2020
Business Acquisition [Line Items]    
Notes payable acquired   $ 15.9
Cash paid for acquisitions   $ 1.0
Other Owner    
Business Acquisition [Line Items]    
Noncontrolling interest, ownership percentage by noncontrolling owners 1.00% 43.00%
Rise Interactive    
Business Acquisition [Line Items]    
Stock repurchased and retired $ 1.9 $ 5.4
Minimum | Quad/Graphics, Inc.    
Business Acquisition [Line Items]    
Parent ownership percentage   57.00%
Maximum | Quad/Graphics, Inc.    
Business Acquisition [Line Items]    
Parent ownership percentage 100.00% 99.00%