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Goodwill and Other Intangible Assets Goodwill and Other Intangible Assets - Additional (Details) - KFMB - USD ($)
$ in Millions
3 Months Ended
Feb. 15, 2018
Mar. 31, 2018
Business Acquisition [Line Items]    
Cash transfered $ 325.9  
Finite-lived intangible assets, remaining amortization period   8 years
Goodwill, acquired during period   $ 23.4
Licensing Agreements    
Business Acquisition [Line Items]    
Indefinite-lived intangible assets acquired   195.4
Retransmission And Network Affiliation Agreements    
Business Acquisition [Line Items]    
Finite-lived intangible assets acquired   $ 78.4