Discontinued Operations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating revenues		$ 6.8
Operating revenues - affiliates		10.5
Total operating revenues		17.3
Operating expenses		15.7
Total operating expenses		15.7
Income (loss) before income taxes		1.6
Income tax provision (benefit)		0.6
Net income (loss)	$ 0	$ 1.0
Gulf Coast Fractionators [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership Percentage	38.75%