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COMMITMENTS AND CONTINGENCIES - Narrative (Details) | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
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Mar. 31, 2023 defendant | Jul. 31, 2018 defendant | Mar. 31, 2016 mi | May 31, 2007 entity mi | Sep. 30, 2025 USD ($) facility case | Dec. 31, 2023 USD ($) | Jun. 30, 2025 USD ($) | Dec. 31, 2024 USD ($) | Sep. 30, 2024 USD ($) | Jun. 30, 2024 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Lease liabilities |  |  |  |  | $ 603,000,000.0 |  |  | $ 591,100,000 | $ 575,400,000 |
Letters of credit outstanding, amount |  |  |  |  | 23,300,000 |  |  |  |  |
Reclamation/restoration requirements |  |  |  |  | 446,100,000 | $ 324,100,000 | $ 447,800,000 | $ 427,400,000 | $ 346,500,000 | $ 334,100,000
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 |  |  |  |  |
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 |  |  |  |
Cases Allegedly Involving 1,1,1-Trichloroethane |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of cases | case |  |  |  |  | 1 |  |  |  |  |
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 | Lawsuit Filed by Occidental |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of defendants | defendant | 39 | 100 |  |  |  |  |  |  |  |
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 |  |  |  |  | $ 28,500,000 |  |  |  |  |
Reclamation/restoration requirements |  |  |  |  | $ 18,700,000 |  |  |  |  |

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