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Asset Retirement Obligations Contingencies - Gypstack (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Loss Contingencies [Line Items]
Discounted asset retirement obligation	$ 1,393.9	$ 1,315.2	$ 1,160.1
Unfavorable Regulatory Action
Loss Contingencies [Line Items]
Discounted asset retirement obligation	669.9	$ 660.2
2015 Consent Decrees With EPA | Unfavorable Regulatory Action
Loss Contingencies [Line Items]
Expected capital improvements and expenses	20.0
Asset retirement obligations, undiscounted	1,600.0
Discounted asset retirement obligation	$ 439.1

X

- Definition

Undiscounted amount of the accrual for environmental loss contingencies.

+ References

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-Publisher FASB
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-Topic 410
-SubTopic 30
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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.

+ References

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Amount of cash outflow reducing loss contingency liability.

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