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Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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RELATED PARTY TRANSACTIONS: (Details) MXN in Millions, $ in Millions	1 Months Ended	3 Months Ended			12 Months Ended
	May. 31, 2010 USD ($)	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)	Mar. 31, 2012 USD ($)	Dec. 31, 2012 USD ($) item MW	Dec. 31, 2005 item	Dec. 31, 2015 USD ($)	Aug. 04, 2014 item	Mar. 31, 2012 MXN	Mar. 31, 2012 USD ($)
RELATED PARTY TRANSACTIONS:
Related parties receivable current:		$ 46.5					$ 15.8
Related parties receivable non-current:		111.2					111.2
Related parties payable:		100.7					69.3
Asarco LLC
RELATED PARTY TRANSACTIONS:
Related parties receivable current:		14.8
Related parties payable:		25.9					20.6
Total purchases		6.2	$ 7.7
Total sales		19.5	35.9
Compania Perforadora Mexico S.A.P.I. de C.V. and affiliates
RELATED PARTY TRANSACTIONS:
Related parties receivable current:		0.8					0.7
Total purchases			0.3
Total sales		0.1	0.1
Ferrocarril Mexicano, S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:							0.2
Related parties payable:		0.7
Total purchases		9.7	3.3
Grupo Mexico
RELATED PARTY TRANSACTIONS:
Related parties receivable current:		1.2					0.6
Related parties payable:		0.2					12.0
Total purchases		8.6	3.4
Total sales		0.1
Mexico Generadora de Energia S. de R.L. ("MGE")
RELATED PARTY TRANSACTIONS:
Related parties receivable current:		29.3					13.9
Related parties receivable non-current:		111.2			$ 184.0		111.2
Related parties payable:		68.3					23.0
Total purchases		56.7	37.8
Total sales		33.0	22.2
Maximum amount of line of credit granted to related party	$ 350.0
Interest rate (as a percent)	4.40%				5.75%
Loan repaid				$ 150.0
Interest earned		1.6	2.3
Percentage of supply to third-party energy users					12.00%
Mexico Generadora de Energia S. de R.L. ("MGE") \| Mexico
RELATED PARTY TRANSACTIONS:
Number of power plants \| item					2	2
Net total capacity (in megawatts) \| MW					516.2
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									MXN 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%
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates
RELATED PARTY TRANSACTIONS:
Related parties receivable current:		0.2					0.3
Related parties payable:		4.0					11.8
Total purchases		8.4	10.6
Total sales			0.2
Operadora de Cinemas S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:		0.1
Related parties payable:		0.3					0.2
Total purchases		0.3
Operadora de Cinemas S.A. de C.V. \| Maximum
RELATED PARTY TRANSACTIONS:
Total sales		0.1
Operadora de Generadoras de Energia Mexico S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:		0.1					0.1
Boutique Bowling de Mexico S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties payable:							0.2
Total purchases		0.2
Boutique Bowling de Mexico S.A. de C.V. \| Maximum
RELATED PARTY TRANSACTIONS:
Total sales		0.1
Breaker, S.A. de C.V and affiliates ("Breaker")
RELATED PARTY TRANSACTIONS:
Related parties payable:		0.3					0.3
Total purchases		0.4	0.3
Eolica El Retiro, S.A.P.I. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties payable:		0.5					0.1
Total purchases		$ 0.5	3.9
Percentage of supply to third-party energy users		12.00%
Number of wind turbines \| item								37
Sempertrans and affiliates
RELATED PARTY TRANSACTIONS:
Related parties payable:							0.6
Total purchases			0.2
Mexico Transportes Aereos S.A. de C.V. ("Mextransport")
RELATED PARTY TRANSACTIONS:
Related parties payable:		$ 0.5					$ 0.5
Total purchases			0.1
Total sales			0.1
Higher Technology S.A.C.
RELATED PARTY TRANSACTIONS:
Total purchases		0.2	0.3
Pigoba S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Total purchases		0.1
Servicios y Fabricaciones Mecanicas S.A.C.
RELATED PARTY TRANSACTIONS:
Total purchases		$ 0.2	0.2
Equity investment in affiliate
RELATED PARTY TRANSACTIONS:
Ownership percentage		44.20%
Grupo Mexico and affiliates
RELATED PARTY TRANSACTIONS:
Total purchases		$ 90.1	67.0
Total sales		52.7	58.4
Companies with relationship to SCC executive officers' families
RELATED PARTY TRANSACTIONS:
Total purchases		0.9	1.0
Companies with relationship to the controlling group
RELATED PARTY TRANSACTIONS:
Total purchases		$ 0.5	0.1
Total sales			$ 0.1