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Revenues (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Trade accounts receivable	$ 182.1	$ 168.8
Trade Accounts Receivable
Disaggregation of Revenue [Line Items]
Trade accounts receivable	$ 111.1	$ 88.3
Bulk pipelines sales
Disaggregation of Revenue [Line Items]
Collection period	7 days
Petroleum product sales, rack sales | Marketing
Disaggregation of Revenue [Line Items]
Collection period	10 days
RINs | Marketing
Disaggregation of Revenue [Line Items]
Collection period	5 days
Minimum | Petroleum product sales (at retail) | Marketing
Disaggregation of Revenue [Line Items]
Collection period	2 days
Maximum | Petroleum product sales (at retail) | Marketing
Disaggregation of Revenue [Line Items]
Collection period	7 days

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