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INCOME TAXES: - Tax Cuts and Jobs Act (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017 USD ($) item	Dec. 31, 2016	Dec. 31, 2015	Mar. 31, 2009
Income Taxes
Percentage of ownership interest held by the parent company		88.90%	88.90%
U.S. statutory rate (as a percent)		35.00%	35.00%	35.00%
Non-cash tax expense for estimated tax effect | $		$ 785.9
Number of new taxes become effective | item		2
Forecast
Income Taxes
U.S. statutory rate (as a percent)	21.00%
Minimum | Beginning in 2018
Income Taxes
BEAT tax rate (as a percent)		5.00%
Minimum | After 2025
Income Taxes
BEAT tax rate (as a percent)		12.50%
AMC | Minimum
Income Taxes
Percentage of ownership interest held by the parent company					80.00%

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I)
-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319

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