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COMMITMENTS AND CONTINGENCIES - Narrative (Details)	1 Months Ended							3 Months Ended	9 Months Ended
	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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