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RELATED PARTY TRANSACTIONS: (Details) $ in Millions |  | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 04, 2014 item | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2012 item MW | Dec. 31, 2018 USD ($)
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Related parties receivable current: |  | $ 22.3 |  |  | $ 101.5
Related parties receivable non-current: |  | 60.0 |  |  |
Related parties payable: |  | 77.5 |  |  | 75.3
Total purchases |  | 1.5 | $ 1.4 |  |
Total sales |  | 1.7 | 1.5 |  |
Grupo Mexico and affiliates |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Total purchases |  | 288.2 | 286.2 |  |
Total sales |  | 44.0 | 135.1 |  |
Asarco LLC |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Related parties receivable current: |  | 9.0 |  |  | 74.4
Related parties receivable non-current: |  | 60.0 |  |  |
Related parties payable: |  | 15.0 |  |  | 4.1
Total purchases |  | 32.2 | 30.0 |  |
Total sales |  | 10.6 | 82.8 |  |
Accounts Payable |  | 62.0 |  |  |
Making quarterly payments |  | 0.5 |  |  |
Asarco LLC | Other Noncurrent Assets [Member] |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Due from related parties, non-current |  | 60.0 |  |  |
Asarco LLC | Other Current Assets [Member] |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Related parties receivable current: |  | $ 2.0 |  |  |
Asarco LLC | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.00% |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 4.08513% |  |  |
AMMINCO |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Related parties receivable current: |  | $ 0.1 |  |  | 0.2
Related parties payable: |  | 4.0 |  |  | 8.0
Total purchases |  | 6.4 |  |  |
AMC |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Related parties receivable current: |  |  |  |  | 11.0
Compania Perforadora Mexico, S.A.P.I. de C.V. and affiliates |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Related parties receivable current: |  | 0.4 |  |  | 1.4
Eolica El Retiro, S.A.P.I. de C.V. |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Related parties payable: |  | 0.3 |  |  | 1.0
Total purchases |  | 2.9 | 2.2 |  |
Number of wind turbines | item | 37 |  |  |  |
Percentage of supply to third-party energy users | 25.40% |  |  |  |
Ferrocarril Mexicano, S.A. de C.V. |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Related parties receivable current: |  |  |  |  | 0.1
Related parties payable: |  | 4.8 |  |  | 6.4
Total purchases |  | 35.1 | 33.0 |  |
Total sales |  | 0.1 |  |  |
Grupo Mexico |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Related parties receivable current: |  | 2.7 |  |  | 2.7
Related parties payable: |  | 0.2 |  |  | 0.6
Total purchases |  | 7.9 | 13.5 |  |
Donations |  | 8.9 |  |  |
Mexico Generadora de Energia, S. de R.L. ("MGE") |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Related parties receivable current: |  | 9.1 |  |  | 10.3
Related parties payable: |  | 34.9 |  |  | 40.6
Total purchases |  | 147.3 | 144.4 |  |
Total sales |  | 33.3 | $ 52.3 |  |
Mexico Generadora de Energia, S. de R.L. ("MGE") | Mexico |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
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 |  |  | 22.00% | 6.20% |
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: |  | 18.0 |  |  | 14.4
Mexico Proyectos y Desarrollos SA de CV and affiliates |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Total purchases |  | $ 56.4 | $ 63.1 |  |
Apu Coropuna S.R.L. |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Ownership percentage |  | 30.00% |  |  |
Boutique Bowling de Mexico, S.A. de C.V. |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Related parties receivable current: |  | $ 0.1 |  |  | 0.3
Related parties payable: |  | 0.2 |  |  | 0.1
Total purchases |  | 0.3 | 0.2 |  |
Total sales |  | 0.1 | 0.2 |  |
Empresarios Industriales de Mexico, S.A. de C.V |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Total sales |  | 0.2 |  |  |
Mexico Transportes Aereos, S.A. de C.V. ("Mextransport") |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Related parties receivable current: |  | 0.3 |  |  | 0.1
Total purchases |  | 1.1 | 1.1 |  |
Total sales |  | 1.3 | 1.2 |  |
Operadora de Cinemas S.A. de C.V. |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Related parties receivable current: |  | 0.1 |  |  | 0.4
Related parties payable: |  | 0.1 |  |  | $ 0.1
Total purchases |  | 0.1 | 0.1 |  |
Total sales |  | $ 0.1 | $ 0.1 |  |
Equity investment in affiliate |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Ownership percentage |  | 44.20% |  |  |

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