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RELATED PARTY TRANSACTIONS: (Details) $ in Millions, $ in Millions		1 Months Ended	3 Months Ended			12 Months Ended
	Aug. 04, 2014 item	May 31, 2010 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2012 USD ($)	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:			$ 66.1					$ 26.1
Related parties payable:			58.9					90.1
Grupo Mexico and affiliates
RELATED PARTY TRANSACTIONS:
Total purchases			99.7	$ 116.4
Total sales			59.7	66.6
Mexico Generadora de Energia, S. de R.L. ("MGE")
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			31.3					16.2
Related parties payable:			28.7					38.5
Total purchases			61.9	61.1
Total sales			23.2	24.4
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						14.00%
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:			29.3					4.1
Related parties payable:			14.8					24.2
Total purchases			6.8	13.0
Total sales			36.5	41.8
Grupo Mexico
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			2.8					2.8
Related parties payable:			3.6					0.7
Total purchases			4.5	3.5
Total sales				0.2
Donations			0.7
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:			0.7					1.1
Related parties payable:			7.7					21.7
Total purchases			15.9	27.1
Ferrocarril Mexicano, S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties payable:			3.2					2.6
Total purchases			10.0	10.8
Eolica el Retiro
RELATED PARTY TRANSACTIONS:
Related parties payable:			0.6					0.8
Total purchases			0.6	0.9
Number of wind turbines | item	37
Percentage of supply to third-party energy users	27.00%
Related to the controlling group
RELATED PARTY TRANSACTIONS:
Total purchases			0.3
Total sales			0.2	0.1
Mexico Transportes Aereos, S.A. de C.V. ("Mextransport")
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			0.1
Related parties payable:			0.1					0.3
Total purchases			0.2
Total sales			0.1
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
Operadora de Cinemas, S.A. de C.V. | Maximum
RELATED PARTY TRANSACTIONS:
Total purchases			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
Total sales			$ 0.1	$ 0.1
Equity investment in affiliate
RELATED PARTY TRANSACTIONS:
Ownership percentage			44.20%

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