Discontinued Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2014	Mar. 07, 2014
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]
Net income (loss)	$ 1.0
Non-contributed assets | GCF Transfer
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]
Revenues	6.8
Revenues - affiliates	10.5
Total revenues	17.3
Operating expenses	15.7
Total operating costs expenses	15.7
Income (loss) before income taxes	1.6
Income tax provision (benefit)	(0.6)
Net income (loss)	$ 1.0
Gulf Coast Fractionators
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity method investment ownership (as a percent)		38.75%