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RELATED PARTY TRANSACTIONS: (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) item | Dec. 31, 2012 item MW | Dec. 31, 2014 item
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Related parties receivable current: | $ 27.3 | $ 33.3 |  |  |
Affiliates |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Related parties receivable current: | 27.3 | 33.3 |  |  |
Other accrued liabilities | 93.6 | 120.2 |  |  |
Total purchases | 418.2 | 534.6 | $ 454.4 |  |
Total sales | $ 3.0 | 2.1 | 2.0 |  |
Affiliates | Equity investment in affiliate |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Ownership percentage | 44.20% |  |  |  |
Affiliates | Apu Coropuna S.R.L. |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Ownership percentage | 30.00% |  |  |  |
Affiliates | Minimum |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Aggregate consideration of Material Affiliate Transaction to be be authorized by the General Counsel and CFO | $ 8.0 |  |  |  |
Affiliates | Maximum |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Aggregate consideration of Material Affiliate Transaction to be be authorized by the General Counsel and CFO | 10.0 |  |  |  |
Grupo Mexico and affiliates | Affiliates |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Total sales | 105.9 | 213.0 | 160.5 |  |
Asarco LLC ("Asarco") | Affiliates |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Related parties receivable current: | 9.4 | 9.2 |  |  |
Other accrued liabilities | 13.8 | 23.8 |  |  |
Total purchases | 30.4 | 66.3 | 31.3 |  |
Total sales | 39.6 | 48.0 | 33.4 |  |
Americas Mining Corporation | Affiliates |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Total sales |  |  | 0.1 |  |
AMMINCO Apoyo Administrativo, S.A. de C.V. ("AMMINCO") | Affiliates |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Other accrued liabilities | 5.0 | 5.0 |  |  |
Total purchases | 10.0 | 10.0 | 8.9 |  |
Total sales |  |  | 0.1 |  |
AMMINCO Apoyo Administrativo, S.A. de C.V. ("AMMINCO") | Affiliates | Maximum |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Related party receivable and payable | 0.1 | 0.1 |  |  |
Threshold revenue from related parties | 0.1 | 0.1 |  |  |
Controladora de Infraestructura Energetica Mexico, S. A. de C. V. | Affiliates |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Total purchases |  | 0.8 |  |  |
Compania Perforadora Mexico S.A.P.I. de C.V. | Affiliates |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Related parties receivable current: |  | 0.3 |  |  |
Eolica El Retiro, S.A.P.I. de C.V. |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Number of wind turbines | item |  |  |  |  | 37
Eolica El Retiro, S.A.P.I. de C.V. | Affiliates |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Other accrued liabilities | 0.2 | 0.4 |  |  |
Total purchases | $ 2.3 | $ 3.0 | 9.3 |  |
Percentage of supply to third-party energy users | 12.00% | 27.00% |  |  |
Ferrocarril Mexicano, S.A. de C.V. | Affiliates |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Other accrued liabilities | $ 7.9 | $ 5.6 |  |  |
Total purchases | 53.0 | 42.9 | 41.8 |  |
Grupo Mexico | Affiliates |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Total purchases | 3.9 | 2.7 | 2.5 |  |
Donations | 4.3 | 3.5 | 0.9 |  |
Grupo Mexico Servicios | Affiliates |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Other accrued liabilities | 2.7 | 20.2 |  |  |
Total purchases | 20.1 | 20.1 | 20.1 |  |
Intermodal Mexico S.A. de C.V. | Affiliates |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Total purchases |  |  | 0.5 |  |
MGE | Mexico |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Number of natural gas-fired combined cycle power generating units | item |  |  |  | 2 |
MGE | Affiliates |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Related parties receivable current: | 17.1 | 23.4 |  |  |
Other accrued liabilities | 50.3 | 57.5 |  |  |
Total purchases | 224.6 | 331.0 | 287.3 |  |
Total sales | $ 66.3 | $ 165.0 | 126.9 |  |
MGE | Affiliates | Mexico |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Net total capacity (in megawatts) | MW |  |  |  | 516.2 |
Percentage of supply to third-party energy users | 7.60% | 1.40% |  |  |
Mexico Compania Constructora S.A de C.V. | Affiliates |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Other accrued liabilities | $ 9.5 | $ 5.9 |  |  |
Total purchases | 59.8 | 43.8 | 44.5 |  |
Grupo Mexico Servicios de Ingenieria, S.A. de C.V. | Affiliates |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Related parties receivable current: |  | 0.2 |  |  |
Other accrued liabilities | 3.5 | 1.2 |  |  |
Total purchases | 18.0 | 16.7 | $ 10.3 |  |
Peru Mining Exploration And Development Company |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Number of mining concessions purchased | item |  |  | 3 |  |
Peru Mining Exploration And Development Company | Affiliates |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Total purchases |  |  | $ 0.4 |  |
Boutique Bowling de Mexico, S.A. de C.V. | Affiliates |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Related parties receivable current: |  | 0.1 |  |  |
Other accrued liabilities | 0.3 | 0.3 |  |  |
Total purchases | 0.7 | 0.4 | 0.3 |  |
Total sales | 0.1 | 0.1 | 0.1 |  |
Empresarios Industriales de Mexico, S.A. de C.V | Affiliates |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Related parties receivable current: | 0.6 |  |  |  |
Total sales | 0.5 |  |  |  |
Mexico Transportes Aereos S.A. de C.V. ("Mextransport") | Affiliates |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Related parties receivable current: | 0.1 |  |  |  |
Other accrued liabilities | 0.3 | 0.1 |  |  |
Total purchases | 2.8 | 2.1 | 1.8 |  |
Total sales | 2.3 | 1.9 | 1.8 |  |
Operadora de Cinemas S.A. de C.V. | Affiliates |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Related parties receivable current: | 0.1 | 0.1 |  |  |
Other accrued liabilities | 0.1 | 0.2 |  |  |
Total purchases | 0.4 | 0.2 | 0.4 |  |
Total sales | $ 0.1 | $ 0.1 | $ 0.1 |  |

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