Other Operating (Income) Expense (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Other Income And Expenses [Abstract]
(Gain) loss on sale or disposition of assets	[1]	$ 0.5	$ 61.1	$ 3.6	$ 14.3
Write-down of assets		17.9		17.9
Miscellaneous business tax			0.4	0.2	1.0
Other			0.3		0.4
Total other operating (income) expense		$ 18.4	$ 61.8	$ 21.7	$ 15.7

[1] Our 2018 loss is 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, 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.