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Other Operating (Income) Expense (Parenthetical) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2018
Jun. 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] $ (46.7) $ 0.1   $ (46.8) $ 16.2
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 $48.1 million gain on sale of our inland marine barge business to a third party during the second quarter of 2018. For additional information, see 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 reduction in the carrying value of our ownership interest in VGS in connection with the April 2017 sale.