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RELATED PARTY TRANSACTIONS: (Details) $ in Millions		6 Months Ended		12 Months Ended
	Aug. 04, 2014 item	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2012 item MW	Dec. 31, 2018 USD ($)
RELATED PARTY TRANSACTIONS:
Related parties receivable current:		$ 91.0			$ 101.5
Related parties payable:		66.7			75.3
Total purchases		1.0	$ 0.9
Total sales		0.9	0.9
Grupo Mexico and affiliates
RELATED PARTY TRANSACTIONS:
Total purchases		188.0	203.2
Total sales		27.7	112.7
Asarco LLC
RELATED PARTY TRANSACTIONS:
Related parties receivable current:		75.5			74.4
Related parties payable:		8.4			4.1
Total purchases		19.8	24.0
Total sales		5.8	70.9
AMMINCO
RELATED PARTY TRANSACTIONS:
Related parties receivable current:					0.2
Related parties payable:		2.0			8.0
Total purchases		4.4
AMC
RELATED PARTY TRANSACTIONS:
Related parties receivable current:					11.0
Compania Perforadora Mexico, S.A.P.I. de C.V. and affiliates
RELATED PARTY TRANSACTIONS:
Related parties receivable current:		0.4			1.4
Eolica El Retiro, S.A.P.I. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties payable:		0.5			1.0
Total purchases		2.0	1.3
Number of wind turbines | item	37
Percentage of supply to third-party energy users	27.80%
Ferrocarril Mexicano, S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:		0.1			0.1
Related parties payable:		8.9			6.4
Total purchases		20.5	22.9
Total sales		0.1
Grupo Mexico
RELATED PARTY TRANSACTIONS:
Related parties receivable current:		2.7			2.7
Related parties payable:		1.5			0.6
Total purchases		5.0	9.0
Donations		4.8
Mexico Generadora de Energia, S. de R.L. ("MGE")
RELATED PARTY TRANSACTIONS:
Related parties receivable current:		10.7			10.3
Related parties payable:		31.0			40.6
Total purchases		100.7	101.5
Total sales		21.8	$ 41.8
Mexico Generadora de Energia, S. de R.L. ("MGE") | Mexico
RELATED PARTY TRANSACTIONS:
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%	4.60%
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates ("MPD")
RELATED PARTY TRANSACTIONS:
Related parties receivable current:		0.5			0.6
Related parties payable:		14.3			14.4
Mexico Proyectos y Desarrollos SA de CV and affiliates
RELATED PARTY TRANSACTIONS:
Total purchases		35.6	$ 44.5
Boutique Bowling de Mexico, S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:		0.1			0.3
Related parties payable:		0.1			0.1
Total purchases		0.1	0.1
Total sales			0.1
Empresarios Industriales de Mexico, S.A. de C.V
RELATED PARTY TRANSACTIONS:
Total purchases		0.1
Mexico Transportes Aereos, S.A. de C.V. ("Mextransport")
RELATED PARTY TRANSACTIONS:
Related parties receivable current:		0.9			0.1
Total purchases		0.8	0.7
Total sales		0.9	0.7
Operadora de Cinemas S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:		$ 0.1			0.4
Related parties payable:					$ 0.1
Total purchases			0.1
Total sales			$ 0.1
Equity investment in affiliate
RELATED PARTY TRANSACTIONS:
Ownership percentage		44.20%

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