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Consolidated Statements of Partners' Equity (Deficit) (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Distribution equivalents on vested phantom units $ 0.5 $ 0.3 $ 0.4
El Dorado Terminal and Tank Assets      
Cash payments for acquisitions   61.9  
Tyler Terminal and Tank Assets      
Decrease in equity balance due to acquisitions   $ 42.7