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Regulatory Matters, Commitments, Contingencies And Environmental Liabilities Narrative (Details) $ in Millions |  | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Aug. 01, 2020 USD ($) | Jun. 30, 2021 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Payments for Environmental Liabilities |  |  | $ 18.0 | $ 22.0 |
Document Period End Date |  |  | Sep. 30, 2021 |  |
Accrual for Environmental Loss Contingencies |  |  | $ 297.0 |  | $ 306.0
Loss Contingency, Estimate of Possible Loss |  |  | 80.0 |  |
Related To Deductibles |  |  |  |  |
Loss Contingency Accrual, at Carrying Value |  |  | $ 130.0 |  | $ 101.0
Sunoco, Inc. [Member] |  |  |  |  |
Loss Contingency, Pending Claims, Number |  |  | 5 |  |
Sunoco [Member] |  |  |  |  |
Site Contingency, Number of Sites Needing Remediation |  |  | 33 |  |
Williams Litigation [Member] |  |  |  |  |
Loss Contingency, Damages Sought, Value |  |  | $ 410.0 |  |
Cline Class Action | Actual Damages |  |  |  |  |
Payments for Legal Settlements | $ 74.8 | $ 80.7 |  |  |
Cline Class Action | punitive damages |  |  |  |  |
Payments for Legal Settlements |  | $ 75.0 |  |  |

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