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INCOME TAXES: - TCJA (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Mar. 31, 2009
Income Taxes
Percentage of ownership by parent	88.90%
U.S. statutory rate (as a percent)	21.00%	21.00%	35.00%
Non-cash tax expense for estimated tax effect of the TCJA			$ 785.9
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Existing Income Tax Expense (Benefit)		$ 816.8
Amount determined for final impact of the TCJA		816.8
Amount of change in income tax expense (benefit) from provisional amount		$ 30.9
Maximum percentage of expenses excluding cost of goods sold	3.00%
Minimum
Income Taxes
BEAT tax rate (as a percent)		5.00%
Minimum | Years 2019 through 2025
Income Taxes
BEAT tax rate (as a percent)	10.00%
Minimum | Years thereafter
Income Taxes
BEAT tax rate (as a percent)	12.50%
AMC | Minimum
Income Taxes
Percentage of ownership by parent				80.00%

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