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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 ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2012 USD ($)	Dec. 31, 2012 item MW	Dec. 31, 2005 item	Dec. 31, 2018 USD ($)	Mar. 31, 2012 MXN ($)	Mar. 31, 2012 USD ($)
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			$ 98.2					$ 101.5
Related parties payable:			66.4					75.3
Total purchases			0.1	$ 0.3
Total sales			0.6	0.2
Grupo Mexico and affiliates
RELATED PARTY TRANSACTIONS:
Total purchases			92.3	99.7
Total sales			17.1	59.7
Asarco LLC
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			74.6					74.4
Related parties payable:			6.6					4.1
Total purchases			10.0	6.8
Total sales			2.0	36.5
AMC
RELATED PARTY TRANSACTIONS:
Related parties receivable current:								11.0
AMMINCO
RELATED PARTY TRANSACTIONS:
Related parties receivable current:								0.2
Related parties payable:			2.4					8.0
Total purchases			2.4
Compania Perforadora Mexico, S.A.P.I. de C.V. and affiliates
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			1.0					1.4
Eolica El Retiro, S.A.P.I. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties payable:			1.0					1.0
Total purchases			0.8	0.6
Number of wind turbines | item	37
Percentage of supply to third-party energy users	20.90%
Ferrocarril Mexicano, S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			0.1					0.1
Related parties payable:			7.6					6.4
Total purchases			10.6	10.0
Grupo Mexico
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			2.7					2.7
Related parties payable:			0.8					0.6
Total purchases			2.5	4.5
Donations			3.4
Mexico Generadora de Energia, S. de R.L. ("MGE")
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			18.0					10.3
Related parties payable:			36.7					40.6
Total purchases			55.2	61.9
Total sales			15.1	$ 23.2
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%		2.10%
Mexico Generadora de Energia, S. de R.L. ("MGE") | Minera Mexico | Maximum
RELATED PARTY TRANSACTIONS:
Ownership percentage									0.001%	0.001%
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 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:			11.2					14.4
Total purchases			10.8	$ 15.9
Boutique Bowling de Mexico, S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			0.3					0.3
Related parties payable:			0.1					0.1
Total purchases			0.1	0.1
Total sales				0.1
Boutique Bowling de Mexico, S.A. de C.V. | Maximum
RELATED PARTY TRANSACTIONS:
Total sales			0.1
Empresarios Industriales de Mexico, S.A. de C.V
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			0.1
Total sales			0.1
Mexico Transportes Aereos, S.A. de C.V. ("Mextransport")
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			0.5					0.1
Total purchases				0.2
Total sales			0.5	0.1
Operadora de Cinemas S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			0.4					0.4
Related parties payable:								$ 0.1
Total purchases			0.1	0.1
Operadora de Cinemas S.A. de C.V. | Maximum
RELATED PARTY TRANSACTIONS:
Related parties payable:			0.1
Total sales			$ 0.1	$ 0.1
Equity investment in affiliate
RELATED PARTY TRANSACTIONS:
Ownership percentage			44.20%

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