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INCOME TAXES: (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Mar. 31, 2009
Related party transactions
Percentage of ownership interest held by the parent company	88.60%	84.60%
U.S. federal and state:
Deferred	$ (143.0)	$ (352.1)	$ (139.3)
Uncertain tax positions	80.0	10.7
Provision for income taxes	(63.0)	(341.4)	(139.3)
Foreign (Peru and Mexico):
Current	620.4	987.1	866.3
Deferred	(92.5)	108.9	42.3
Provision for income taxes	527.9	1,096.0	908.6
Total provision for income taxes	464.9	754.6	769.3
Earnings by location:
U.S.	(2.1)	(1.7)	0.1
Peru	213.2	605.7	773.8
Mexico	978.1	1,464.6	1,598.7
Foreign	1,191.3	2,070.3	2,372.5
Income before income taxes	$ 1,189.2	$ 2,068.6	$ 2,372.6
AMC | Minimum
Related party transactions
Percentage of ownership interest held by the parent company				80.00%

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- Definition

The component of total income tax expense for the period comprised of the increase (decrease) during the period in the entity's domestic and state deferred tax assets and liabilities attributable to continuing operations as determined by applying the provisions of the federally enacted and applicable state tax law.

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