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Acquisitions and Divestitures (Narrative) (Details) - Marketing Supply and Logistics - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Oct. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
West Coast      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Disposal Group, Including Discontinued Operation, Consideration $ 70.5    
Property, Plant and Equipment, Gross, Period Decrease 61.8    
Goodwill, Period Decrease 9.0    
Decrease in Other Operating Assets $ 26.6    
Gain (Loss) on Sale of Assets and Asset Impairment Charges   $ 26.9 $ 81.4
US Salt, LLC      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Disposal Group, Including Discontinued Operation, Consideration     223.6
Gain (Loss) on Sale of Assets and Asset Impairment Charges     $ 33.6