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Goodwill and Other Intangible Assets - Narrative (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2018
USD ($)
Finite-Lived Intangible Assets [Line Items]  
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year $ 6.9
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 27.7
Finite-Lived Intangible Assets, Amortization Expense, Year Two 26.4
Finite-Lived Intangible Assets, Amortization Expense, Year Three 24.1
Finite-Lived Intangible Assets, Amortization Expense, Year Four 20.9
Finite-Lived Intangible Assets, Amortization Expense, Year Five 15.9
Finite-Lived Intangible Assets, Amortization Expense, after Year Five 132.3
Cable And Satellite Carriage Rights  
Finite-Lived Intangible Assets [Line Items]  
Finite-lived Intangible Assets Acquired $ 5.8