Program Rights (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Entertainment [Abstract]
Program rights write-offs	$ 7.9	$ 10.3	$ 12.1	$ 13.6

The write-off of unamortized costs for program rights (including feature films and episodic series, acquired under license agreements or owned original program rights).

No definition available.

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