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Revenues (Disaggregation of Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Disaggregation of Revenue [Line Items] |  |  |
Revenue |  | $ 3,537.1 | $ 3,184.8
Total petroleum product sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | [1] | 2,635.8 | 2,480.2
Petroleum product sales (at retail) |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue |  | 2,384.8 | 2,246.2
Petroleum product sales (at wholesale) |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue |  | 251.0 | 234.0
Merchandise sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue |  | 833.2 | 687.5
RINs |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue |  | 66.7 | 15.5
Other revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue |  | 1.4 | 1.6
Operating Segments | Marketing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue |  | 3,537.1 | 3,184.7
Operating Segments | Marketing | Total petroleum product sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue |  | 2,635.8 | 2,480.2
Operating Segments | Marketing | Petroleum product sales (at retail) |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue |  | 2,384.8 | 2,246.2
Operating Segments | Marketing | Petroleum product sales (at wholesale) |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue |  | 251.0 | 234.0
Operating Segments | Marketing | Merchandise sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue |  | 833.2 | 687.5
Operating Segments | Marketing | RINs |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue |  | 66.7 | 15.5
Operating Segments | Marketing | Other revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue |  | 1.4 | 1.5
Corporate and Other Assets |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue |  | 0.0 | 0.1
Corporate and Other Assets | Total petroleum product sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue |  | 0.0 | 0.0
Corporate and Other Assets | Petroleum product sales (at retail) |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue |  | 0.0 | 0.0
Corporate and Other Assets | Petroleum product sales (at wholesale) |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue |  | 0.0 | 0.0
Corporate and Other Assets | Merchandise sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue |  | 0.0 | 0.0
Corporate and Other Assets | RINs |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue |  | 0.0 | 0.0
Corporate and Other Assets | Other revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue |  | $ 0.0 | $ 0.1
[1] | Includes excise taxes of $469.6 million for the three months ended March 31, 2021, $473.5 million for the three months ended March 31, 2020, $469.6 million for the three months ended March 31, 2021 and $473.5 million the three months ended March 31, 2020.

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- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130543-203045 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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