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Acquisitions, Dispositions, and Deconsolidations - Broadcasting Segment (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Business Acquisition [Line Items]      
Asset acquisitions, cash consideration transferred $ 19.2 $ 20.2  
Broadcasting      
Business Acquisition [Line Items]      
Asset acquisitions, cash consideration transferred $ 13.0   $ 71.4