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Overview and Basis of Presentation - Additional Information (Details) - USD ($)
shares in Millions, $ in Millions
6 Months Ended
Aug. 04, 2017
Jun. 21, 2017
Mar. 28, 2017
Oct. 01, 2016
Jun. 30, 2018
Jun. 30, 2017
Organization Consolidation And Presentation Of Financial Statements [Line Items]            
Distribution of common shares during spinoff       26.2    
Percentage of distribution of common shares during spinoff       80.75%    
Description of distribution of common shares during spinoff         Holders of RRD common stock received one share of Donnelley Financial common stock for every eight shares of RRD common stock held on September 23, 2016.  
Proceeds from the issuance of common stock         $ 1.2 $ 18.8
R.R. Donnelley & Sons Company            
Organization Consolidation And Presentation Of Financial Statements [Line Items]            
Number of common stock retained   0.1   6.2    
Ownership percentage       19.25%    
Underwritten Public Offering | R.R. Donnelley & Sons Company            
Organization Consolidation And Presentation Of Financial Statements [Line Items]            
Number of common stock sold 0.1 6.1 6.2      
Proceeds from the issuance of common stock   $ 18.8        
Underwritten Public Offering | R.R. Donnelley & Sons Company | Common Stock            
Organization Consolidation And Presentation Of Financial Statements [Line Items]            
Stock issued upon exercise of underwriters options   0.9