Acquisitions (Details) gal in Millions, $ in Millions	Dec. 17, 2014 USD ($)	Oct. 01, 2014 USD ($) bbl	Jan. 02, 2014 USD ($) gal	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)
Business Acquisition [Line Items]
Goodwill				$ 74.4	$ 73.9	$ 73.9	$ 72.7
FTT Assets [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	$ 11.9
Number of trucks acquired	123
Number of trailers acquired	205
Working capital acquired	$ 0.6
Property, plant, and equipment acquired	10.8
Goodwill	0.5
Total	$ 11.9
Mount Pleasant Terminal [Member]
Business Acquisition [Line Items]
Storage capacity (barrels) | bbl		200,000
Greenville Terminal [Member]
Business Acquisition [Line Items]
Storage capacity (barrels) | bbl		325,000
Greenville-Mt. Pleasant Assets [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross		$ 11.1
Property, plant, and equipment acquired		4.8
Inventory acquired		1.1
Intangible assets		5.2
Total		$ 11.1
Crossett Facility [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross			$ 11.1
Property, plant, and equipment acquired			11.0
Inventory acquired			$ 0.1
Yearly Production Capacity (gallons) | gal			10.0