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Related Party Transactions - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Related Party Transactions [Abstract]        
Related party revenue earned from commercial agreement with TEGNA $ 0.0 $ 2.1 $ 3.4 $ 6.3