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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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