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RELATED PARTY TRANSACTIONS: (Details) $ in Millions | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Dec. 31, 2012 item MW | Dec. 31, 2023 USD ($) | Dec. 31, 2014 item
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Related parties receivable current: | $ 16.9 |  |  | $ 27.3 |
Affiliates |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Related parties receivable current: | 16.9 |  |  | 27.3 |
Other accrued liabilities | 61.8 |  |  | 93.6 |
Total purchases | 191.6 | $ 223.4 |  |  |
Total sales | $ 1.5 | 1.3 |  |  |
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 |  |  |  |
Total sales | 0.1 | 0.1 |  |  |
Grupo Mexico and affiliates | Affiliates |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Total sales | 37.6 | 45.6 |  |  |
Asarco LLC ("Asarco") | Affiliates |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Related parties receivable current: | 7.7 |  |  | 9.4 |
Other accrued liabilities | 14.9 |  |  | 13.8 |
Total purchases | 2.7 | 29.5 |  |  |
Total sales | 14.3 | 17.3 |  |  |
AMMINCO Apoyo Administrativo, S.A. de C.V. ("AMMINCO") | Affiliates |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Other accrued liabilities | 6.2 |  |  | 5.0 |
Total purchases | 5.0 | 5.0 |  |  |
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 | 2.6 |  |  | 0.2 |
Total purchases | $ 4.0 | $ 1.5 |  |  |
Percentage of supply to third-party energy users | 37.00% | 18.50% |  |  |
Ferrocarril Mexicano, S.A. de C.V. | Affiliates |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Other accrued liabilities | $ 6.1 |  |  | 7.9 |
Total purchases | 24.0 | $ 28.9 |  |  |
Grupo Mexico | Affiliates |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Total purchases | 1.7 | 1.8 |  |  |
Grupo Mexico Servicios | Affiliates |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Other accrued liabilities | 3.5 |  |  | 2.7 |
Total purchases | 10.1 | 10.1 |  |  |
Donations | 1.5 | 2.0 |  |  |
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: | 8.1 |  |  | 17.1 |
Other accrued liabilities | 19.9 |  |  | 50.3 |
Total purchases | 92.3 | 116.4 |  |  |
Total sales | $ 23.3 | $ 28.3 |  |  |
MGE | Affiliates | Mexico |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Net total capacity (in megawatts) | MW |  |  | 516.2 |  |
Percentage of supply to third-party energy users | 7.00% | 4.00% |  |  |
Mexico Compania Constructora S.A de C.V. | Affiliates |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Other accrued liabilities | $ 7.1 |  |  | 9.5 |
Total purchases | 44.0 | $ 24.1 |  |  |
Grupo Mexico Servicios de Ingenieria, S.A. de C.V. | Affiliates |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Other accrued liabilities | 0.7 |  |  | 3.5 |
Total purchases | 9.5 | 7.9 |  |  |
Boutique Bowling de Mexico, S.A. de C.V. | Affiliates |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Other accrued liabilities | 0.4 |  |  | 0.3 |
Total purchases | 0.3 | 0.3 |  |  |
Total sales | 0.1 | 0.1 |  |  |
Empresarios Industriales de Mexico, S.A. de C.V | Affiliates |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Related parties receivable current: | 0.6 |  |  | 0.6 |
Total sales | 0.1 |  |  |  |
Mexico Transportes Aereos S.A. de C.V. ("Mextransport") | Affiliates |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Related parties receivable current: | 0.4 |  |  | 0.1 |
Other accrued liabilities | 0.1 |  |  | 0.3 |
Total purchases | 1.2 | 1.3 |  |  |
Total sales | 1.2 | 1.1 |  |  |
Operadora de Cinemas S.A. de C.V. | Affiliates |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Related parties receivable current: | 0.1 |  |  | 0.1 |
Other accrued liabilities | 0.3 |  |  | 0.1 |
Total purchases | 0.2 | 0.2 |  |  |
Total sales | $ 0.1 | 0.1 |  |  |
Amminco Apoyo, Ferrocarril Mexicano and Operadora De Cinemas | Affiliates | Maximum |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Related party receivable and payable |  |  |  | $ 0.1 |
Amminco Apoyo and Ferrocarril Mexicano | Affiliates | Maximum |  |  |  |  |
RELATED PARTY TRANSACTIONS: |  |  |  |  |
Threshold revenue from related parties |  | $ 0.1 |  |  |

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