Other Operating (Income) Expense (Parenthetical) (Details) - USD ($) $ in Millions		3 Months Ended				9 Months Ended
		Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2017	Mar. 31, 2017	Sep. 30, 2018	Sep. 30, 2017
Other Operating Income Expense [Line Items]
Gain on sale of inland marine barge business			$ 48.1			$ 48.1
(Gain) loss on sale or disposition of assets	[1]	$ 61.1		$ 0.3		$ 14.3	$ 16.6
Refined Products And Crude Oil Storage And Terminaling Facilities [Member] | Tacoma, WA, And Baltimore, MD [Member]
Other Operating Income Expense [Line Items]
(Gain) loss on sale or disposition of assets		$ 57.5
Venice Gathering System, L.L.C. [Member] | Not Qualify as Discontinued Operations [Member]
Other Operating Income Expense [Line Items]
(Gain) loss on sale or disposition of assets					$ 16.1

[1] Comprised primarily of a $57.5 million loss on sale of our refined products and crude oil storage and terminaling facilities in Tacoma, WA, and Baltimore, MD during the third quarter of 2018 as disclosed in Note 4 — Newly-Formed Joint Ventures, Acquisitions and Divestitures, offset by a $48.1 million gain on sale of our inland marine barge business to a third party during the second quarter of 2018 as disclosed in Note 6 — Property, Plant and Equipment and Intangible Assets. Also includes a $16.1 million loss in the first quarter of 2017 due to the sale of our ownership interest in VGS.