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Goodwill and Other Intangible Assets - Additional (Details) - KFMB - USD ($) $ in Millions |  | 3 Months Ended
--- | --- | ---
Feb. 15, 2018 | Sep. 30, 2018
Business Acquisition [Line Items] |  |
Estimated consideration transferred | $ 328.4 |
Working capital adjustment |  | $ 2.5
Finite-lived intangible assets, remaining amortization period | 10 years |
Goodwill, acquired during period | $ 17.4 |
Increase in goodwill |  | $ 0.3
Licensing Agreements |  |
Business Acquisition [Line Items] |  |
Indefinite-lived intangible assets acquired | 192.2 |
Retransmission And Network Affiliation Agreements |  |
Business Acquisition [Line Items] |  |
Finite-lived intangible assets acquired | $ 91.4 |

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