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Commitments and Contingencies - Crude Oil Releases (Details) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2021 USD ($) crudeOilRelease	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Loss Contingencies [Line Items]
Number Of Crude Oil Releases | crudeOilRelease	1
Accrual for Environmental Loss Contingencies, Charges to Expense for New Losses		$ 0.5	$ 7.1
Greenville Dixon Release
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies, Charges to Expense for New Losses	$ 0.3
Accrual for environmental loss contingencies	2.4
Operating Expense [Member]
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies	$ 0.3

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Number Of Crude Oil Releases

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Total costs accrued as of the balance sheet date for environmental loss contingencies.

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Amount of expense for newly incurred environmental loss contingencies. Includes, but is not limited to, remediation expense and interest accretion.

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