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COMMITMENTS AND CONTINGENCIES - Narrative (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |  |  |
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Mar. 31, 2023 USD ($) defendant | Dec. 31, 2020 case | Jul. 31, 2018 defendant | Dec. 31, 2017 | Sep. 30, 2017 well | Mar. 31, 2016 mi | May 31, 2007 entity mi | Jun. 30, 2022 | Sep. 30, 2024 USD ($) facility | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) | Nov. 30, 2017 case
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease liabilities |  |  |  |  |  |  |  |  | $ 575,400,000 |  | $ 583,800,000 | $ 614,700,000 |  |  |
Reclamation/restoration requirements |  |  |  |  |  |  |  |  | 346,500,000 | $ 334,100,000 | $ 324,100,000 | $ 315,500,000 | $ 311,600,000 | $ 311,300,000 |
Number of groundwater extraction wells | well |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |
Contingency loss |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Hewitt Landfill Matter | NHW Treatment System |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated capital cost of treatment system |  |  |  |  |  |  |  |  | 92,000,000 |  |  |  |  |  |
Bond money obtained for treatment system |  |  |  |  |  |  |  |  | 46,000,000 |  |  |  |  |  |
Hewitt Landfill Matter | NHC Treatment System |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated capital cost of treatment system |  |  |  |  |  |  |  |  | 245,000,000 |  |  |  |  |  |
Bond money obtained for treatment system |  |  |  |  |  |  |  |  | 95,000,000 |  |  |  |  |  |
Vulcan Material |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Judge ruled allocation of fault among defendants, percentage |  | 15.00% |  | 15.00% |  |  |  | 15.00% |  |  |  |  |  |  |
Texas Brine |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of pending claims | case |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3
Number of cases, reversed judgement | case |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Lawsuit Against CalMat Co |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Charge for litigation matter | $ 11,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated construction and operation of water treatment system | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cooperating Parties Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of other companies to perform Remedial Investigation/Feasibility Study | entity |  |  |  |  |  |  | 70 |  |  |  |  |  |  |  |
Number of miles of the River used in the Remedial Investigation/Feasibility Study | mi |  |  |  |  |  |  | 17 |  |  |  |  |  |  |  |
Number of miles for bank-to-bank dredging remedy | mi |  |  |  |  |  | 8 |  |  |  |  |  |  |  |  |
EPA | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated implementation costs |  |  |  |  |  |  |  |  | $ 1,380,000,000 |  |  |  |  |  |
Occidental Chemical Co |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Judge ruled allocation of fault among defendants, percentage |  | 30.00% |  | 50.00% |  |  |  |  |  |  |  |  |  |  |
Occidental Chemical Co | Lawsuit Filed by Occidental |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of defendants | defendant | 39 |  | 100 |  |  |  |  |  |  |  |  |  |  |  |
Texas Brine |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Judge ruled allocation of fault among defendants, percentage |  | 55.00% |  | 35.00% |  |  |  |  |  |  |  |  |  |  |
LADWP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of planned new treatment capabilities | facility |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Standby Letters of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding, amount |  |  |  |  |  |  |  |  | $ 95,200,000 |  |  |  |  |  |
Reclamation/restoration requirements |  |  |  |  |  |  |  |  | $ 14,900,000 |  |  |  |  |  |

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