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Asset Retirement Obligations Contingencies - Gypstack (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Loss Contingencies [Line Items]
Discounted asset retirement obligation	$ 2,572.2	$ 2,213.4	$ 1,905.6
Unfavorable Regulatory Action
Loss Contingencies [Line Items]
Discounted asset retirement obligation	1,500.0	$ 1,200.0
2015 Consent Decrees With EPA | Unfavorable Regulatory Action
Loss Contingencies [Line Items]
Asset retirement obligations, undiscounted	2,300.0
Discounted asset retirement obligation	$ 1,100.0

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- Definition

Undiscounted amount of the accrual for environmental loss contingencies.

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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.

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