The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 25
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481999/410-20-25-4

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481850/410-20-50-1

COMMITMENTS AND CONTINGENCIES - Narrative (Details)	1 Months Ended							6 Months Ended
COMMITMENTS AND CONTINGENCIES - Narrative (Details)	Mar. 31, 2023 USD ($) defendant	Dec. 31, 2020 case	Jul. 31, 2018 defendant	Dec. 31, 2017	Sep. 30, 2017 well	Mar. 31, 2016 mi	May 31, 2007 entity mi	Jun. 30, 2025 USD ($) case facility	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Sep. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Nov. 30, 2017 case
Loss Contingencies [Line Items]
Lease liabilities								$ 602,000,000.0		$ 591,100,000	$ 580,700,000
Letters of credit outstanding, amount								24,700,000
Reclamation/restoration requirements								447,800,000	$ 429,500,000	$ 427,400,000		$ 334,100,000	$ 325,700,000	$ 324,100,000
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%
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
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
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								$ 30,600,000
Reclamation/restoration requirements								$ 20,800,000