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Goodwill and Intangible Assets (Indefinite-Lived Intangible Assets) (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Mar. 31, 2017
Tradenames    
Indefinite-lived Intangible Assets [Line Items]    
Indefinite-lived intangible assets not subject to amortization [1] $ 250.0 $ 250.0
[1] Tradenames are primarily related to the Starz brand name, which have an indefinite useful life and are not amortized, but rather are assessed for impairment at least annually or more frequently whenever events or circumstances indicate that the rights might be impaired.