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RELATED PARTY TRANSACTIONS: (Details) $ in Millions, $ in Millions		1 Months Ended	3 Months Ended	6 Months Ended		12 Months Ended
	Aug. 04, 2014 item	May 31, 2010 USD ($)	Mar. 31, 2012 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2012 item MW	Dec. 31, 2005 item	Dec. 31, 2017 USD ($)	Mar. 31, 2012 MXN ($)	Mar. 31, 2012 USD ($)
RELATED PARTY TRANSACTIONS:
Related parties receivable current:				$ 76.2				$ 26.1
Related parties payable:				59.2				90.1
Grupo Mexico and affiliates
RELATED PARTY TRANSACTIONS:
Total purchases				203.2	$ 243.2
Total sales				112.7	131.9
Mexico Generadora de Energia, S. de R.L. ("MGE")
RELATED PARTY TRANSACTIONS:
Related parties receivable current:				8.1				16.2
Related parties payable:				24.6				38.5
Total purchases				101.5	118.9
Total sales				41.8	49.4
Maximum amount of line of credit granted to related party		$ 350.0
Interest rate (as a percent)		4.40%
Loan repaid			$ 150.0
Mexico Generadora de Energia, S. de R.L. ("MGE") | Mexico
RELATED PARTY TRANSACTIONS:
Number of power plants | item						2	2
Number of natural gas-fired combined cycle power generating units | item						2
Net total capacity (in megawatts) | MW						516.2
Percentage of supply to third-party energy users						17.00%
Mexico Generadora de Energia, S. de R.L. ("MGE") | Controladora de Infraestructura Energetica Mexico, S. A. de C. V.
RELATED PARTY TRANSACTIONS:
Percentage of interest acquired									99.999%	99.999%
Value of interest acquired									$ 1,928.6	$ 150.0
Mexico Generadora de Energia, S. de R.L. ("MGE") | Controladora de Infraestructura Energetica Mexico, S. A. de C. V. | Mexico
RELATED PARTY TRANSACTIONS:
Percentage of interest acquired						99.999%
Mexico Generadora de Energia, S. de R.L. ("MGE") | Minera Mexico | Maximum
RELATED PARTY TRANSACTIONS:
Ownership percentage									0.001%	0.001%
Asarco LLC
RELATED PARTY TRANSACTIONS:
Related parties receivable current:				62.1				4.1
Related parties payable:				15.0				24.2
Total purchases				24.0	19.6
Total sales				70.9	82.1
Grupo Mexico
RELATED PARTY TRANSACTIONS:
Related parties receivable current:				2.7				2.8
Related parties payable:				6.0				0.7
Total purchases				9.0	6.9
Total sales					0.2
Donations				1.5
Compania Perforadora Mexico, S.A.P.I. de C.V. and affiliates
RELATED PARTY TRANSACTIONS:
Related parties receivable current:				1.4				1.4
Total sales					0.2
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates
RELATED PARTY TRANSACTIONS:
Related parties receivable current:				0.5				1.1
Related parties payable:				9.0				21.7
Total purchases				44.5	72.3
Ferrocarril Mexicano, S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:				0.1
Related parties payable:				3.9				2.6
Total purchases				22.9	23.5
Eolica el Retiro
RELATED PARTY TRANSACTIONS:
Related parties payable:				0.5				0.8
Total purchases				1.3	2.0
Number of wind turbines | item	37
Percentage of supply to third-party energy users	16.00%
Related to the controlling group
RELATED PARTY TRANSACTIONS:
Total purchases				0.9	0.6
Total sales				0.9	0.2
Mexico Transportes Aereos, S.A. de C.V. ("Mextransport")
RELATED PARTY TRANSACTIONS:
Related parties receivable current:				0.8
Related parties payable:								0.3
Total purchases				0.7	0.4
Total sales				0.7
Operadora de Cinemas, S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:				0.3				0.3
Related parties payable:				0.1				0.7
Total purchases				0.1	0.1
Total sales				0.1	0.1
Boutique Bowling de Mexico, S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:				0.2				0.2
Related parties payable:				0.1				$ 0.6
Total purchases				0.1	0.1
Total sales				$ 0.1	$ 0.1
Equity investment in affiliate
RELATED PARTY TRANSACTIONS:
Ownership percentage				44.20%

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