Benefit Plans (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Retirement Benefits [Abstract]
Total expense related to all benefit plans	$ 8.3	$ 5.9	$ 9.1

The Total Expense Related To The Defined Benefit Plans and Defined Contribution Plans.

No definition available.

Name:	amcx_BenefitPlanExpenseDefinedBenefitPlansAndDefinedContributionPlans
Namespace Prefix:	amcx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration