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Goodwill and Intangible Assets (Indefinite-Lived Intangible Assets) (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Mar. 31, 2018
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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.

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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