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Revenues (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disaggregation of Revenue [Line Items] |  |
Earned rewards, expiration period | 90 days |
Trade accounts receivable | $ 168.8 | $ 172.9
Receivables related to contracts with customers |  |
Disaggregation of Revenue [Line Items] |  |
Trade accounts receivable | $ 88.3 | $ 96.0
Petroleum product sales, rack sales |  |
Disaggregation of Revenue [Line Items] |  |
Collection period | 10 days |
Renewable Identification Numbers (RINs) sales |  |
Disaggregation of Revenue [Line Items] |  |
Collection period | 5 days |
Minimum | Petroleum product sales (at retail) |  |
Disaggregation of Revenue [Line Items] |  |
Collection period | 2 days |
Maximum | Petroleum product sales (at retail) |  |
Disaggregation of Revenue [Line Items] |  |
Collection period | 7 days |

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