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RELATED PARTY TRANSACTIONS: (Details) MXN in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 31, 2010 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2012 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2015 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: |  | $ 28.3 |  | $ 28.3 |  |  |  | $ 15.8 |  |  |
Related parties receivable non-current: |  | 74.8 |  | 74.8 |  |  |  | 111.2 |  |  |
Related parties payable: |  | 75.2 |  | 75.2 |  |  |  | 69.3 |  |  |
Asarco LLC |  |  |  |  |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |  |  |  |  |  |  |
Related parties receivable current: |  | 6.1 |  | 6.1 |  |  |  |  |  |  |
Related parties payable: |  | 34.5 |  | 34.5 |  |  |  | 20.6 |  |  |
Total purchases |  |  |  | 14.8 | $ 14.7 |  |  |  |  |  |
Total sales |  |  |  | 34.6 | 71.1 |  |  |  |  |  |
Compania Perforadora Mexico S.A.P.I. de C.V. and affiliates |  |  |  |  |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |  |  |  |  |  |  |
Related parties receivable current: |  | 1.2 |  | 1.2 |  |  |  | 0.7 |  |  |
Total purchases |  |  |  |  | 0.3 |  |  |  |  |  |
Total sales |  |  |  | 0.4 | 0.2 |  |  |  |  |  |
Eolica El Retiro, S.A.P.I. de C.V. |  |  |  |  |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |  |  |  |  |  |  |
Related parties payable: |  | 0.2 |  | 0.2 |  |  |  | 0.1 |  |  |
Total purchases |  |  |  | $ 1.0 | 4.8 |  |  |  |  |  |
Percentage of supply to third-party energy users |  |  |  | 11.00% |  |  |  |  |  |  |
Number of wind turbines | item |  |  |  |  |  |  |  |  | 37 |  |
Ferrocarril Mexicano, S.A. de C.V. |  |  |  |  |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |  |  |  |  |  |  |
Related parties receivable current: |  |  |  |  |  |  |  | 0.2 |  |  |
Related parties payable: |  | 0.1 |  | $ 0.1 |  |  |  |  |  |  |
Total purchases |  |  |  | 21.0 | 8.2 |  |  |  |  |  |
Grupo Mexico |  |  |  |  |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |  |  |  |  |  |  |
Related parties receivable current: |  | 4.7 |  | 4.7 |  |  |  | 0.6 |  |  |
Related parties payable: |  | 0.8 |  | 0.8 |  |  |  | 12.0 |  |  |
Total purchases |  |  |  | 6.9 | 6.9 |  |  |  |  |  |
Total sales |  |  |  | 0.3 |  |  |  |  |  |  |
Mexico Generadora de Energia S. de R.L. ("MGE") |  |  |  |  |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |  |  |  |  |  |  |
Related parties receivable current: |  | 14.9 |  | 14.9 |  |  |  | 13.9 |  |  |
Related parties receivable non-current: |  | 74.8 |  | 74.8 |  | $ 184.0 |  | 111.2 |  |  |
Related parties payable: |  | 30.8 |  | 30.8 |  |  |  | 23.0 |  |  |
Total purchases |  |  |  | 108.7 | 62.9 |  |  |  |  |  |
Total sales |  |  |  | 50.1 | 39.0 |  |  |  |  |  |
Maximum amount of line of credit granted to related party | $ 350.0 |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 4.40% |  |  |  |  | 5.75% |  |  |  |  |
Loan repaid |  | 36.4 | $ 150.0 |  |  |  |  |  |  |  |
Interest earned |  |  |  | 3.1 | 4.7 |  |  |  |  |  |
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: |  | 1.2 |  | 1.2 |  |  |  | 0.3 |  |  |
Related parties payable: |  | 7.5 |  | 7.5 |  |  |  | 11.8 |  |  |
Total purchases |  |  |  | 42.8 | 18.6 |  |  |  |  |  |
Total sales |  |  |  | 0.3 | 0.4 |  |  |  |  |  |
Boutique Bowling de Mexico S.A. de C.V. |  |  |  |  |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |  |  |  |  |  |  |
Related parties payable: |  |  |  |  |  |  |  | 0.2 |  |  |
Total purchases |  |  |  | 0.2 |  |  |  |  |  |  |
Total sales |  |  |  | 0.1 |  |  |  |  |  |  |
Mexico Transportes Aereos S.A. de C.V. ("Mextransport") |  |  |  |  |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |  |  |  |  |  |  |
Related parties payable: |  | 0.5 |  | 0.5 |  |  |  | 0.5 |  |  |
Total purchases |  |  |  | 1.0 | 0.1 |  |  |  |  |  |
Total sales |  |  |  | 0.2 | 0.1 |  |  |  |  |  |
Operadora de Generadoras de Energia Mexico S.A. de C.V. |  |  |  |  |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |  |  |  |  |  |  |
Related parties receivable current: |  | 0.1 |  | 0.1 |  |  |  | 0.1 |  |  |
Operadora de Cinemas S.A. de C.V. |  |  |  |  |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |  |  |  |  |  |  |
Related parties receivable current: |  | 0.1 |  | 0.1 |  |  |  |  |  |  |
Related parties payable: |  | 0.3 |  | 0.3 |  |  |  | 0.2 |  |  |
Total purchases |  |  |  | 0.3 |  |  |  |  |  |  |
Breaker, S.A. de C.V and affiliates ("Breaker") |  |  |  |  |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |  |  |  |  |  |  |
Related parties payable: |  | 0.3 |  | 0.3 |  |  |  | 0.3 |  |  |
Total purchases |  |  |  | 0.4 | 0.5 |  |  |  |  |  |
Higher Technology S.A.C. |  |  |  |  |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |  |  |  |  |  |  |
Related parties payable: |  | $ 0.2 |  | 0.2 |  |  |  |  |  |  |
Total purchases |  |  |  | 0.6 | 0.8 |  |  |  |  |  |
Sempertrans and affiliates |  |  |  |  |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |  |  |  |  |  |  |
Related parties payable: |  |  |  |  |  |  |  | $ 0.6 |  |  |
Total purchases |  |  |  |  | 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 | 0.4 |  |  |  |  |  |
Equity investment in affiliate |  |  |  |  |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  | 44.20% |  | 44.20% |  |  |  |  |  |  |
Grupo Mexico and affiliates |  |  |  |  |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |  |  |  |  |  |  |
Total purchases |  |  |  | $ 195.2 | 116.4 |  |  |  |  |  |
Total sales |  |  |  | 85.7 | 110.7 |  |  |  |  |  |
Companies with relationship to SCC executive officers' families |  |  |  |  |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |  |  |  |  |  |  |
Total purchases |  |  |  | 1.3 | 2.0 |  |  |  |  |  |
Companies with relationship to the controlling group |  |  |  |  |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |  |  |  |  |  |  |
Total purchases |  |  |  | 1.5 | 0.1 |  |  |  |  |  |
Total sales |  |  |  | $ 0.3 | $ 0.1 |  |  |  |  |  |

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