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Acquisitions and Strategic Investments (Change in Ownership in Rise Interactive) (Details) - Rise Interactive - USD ($)
$ in Millions
Jun. 15, 2020
Jun. 16, 2020
Business Acquisition [Line Items]    
Notes payable issued for purchase price $ 15.9  
Cash paid for acquisition $ 1.0  
Other Owner    
Business Acquisition [Line Items]    
Ownership interest by noncontrolling interests 43.00% 1.00%
Minimum | Quad/Graphics, Inc.    
Business Acquisition [Line Items]    
Ownership interest 57.00%  
Maximum | Quad/Graphics, Inc.    
Business Acquisition [Line Items]    
Ownership interest 99.00%  
Rise Interactive    
Business Acquisition [Line Items]    
Stock repurchased and retired during period, value $ 5.4