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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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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 + Details
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