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Discontinued Operations - Narrative (Details)
$ in Millions
3 Months Ended
Jul. 31, 2017
USD ($)
seat
Mar. 31, 2018
USD ($)
May 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Conversion ratio for every share of Tegna common stock owned by stockholders     0.3333
CareerBuilder      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Proceeds from sale of discontinued operation | $ $ 198.3    
CareerBuilder      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Equity method investment retained after disposal, ownership interest (as a percent) 17.00% 17.00%  
Equity method investment retained after disposal, fully diluted ownership interest (as a percent) 12.00% 12.00%  
Number seats retained on Board of Directors after sale | seat 2    
Total number of seats on Board of Directors | seat 10    
Equity income (loss) in unconsolidated investments, net | $   $ 1.3