Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Sales to external customers	$ 773.1us-gaap_OilAndGasRevenue	$ 232.4us-gaap_OilAndGasRevenue
Sales to affiliates	163.0us-gaap_RevenueFromRelatedParties	491.9us-gaap_RevenueFromRelatedParties
Purchased gas, NGLs, condensate and crude oil	(657.4)us-gaap_CostOfPurchasedOilAndGas	(538.9)us-gaap_CostOfPurchasedOilAndGas
Operating expenses	(96.2)us-gaap_OperatingCostsAndExpenses	(46.2)us-gaap_OperatingCostsAndExpenses
Gain on derivative activity	0.2	(1.3)
Segment profit	182.7us-gaap_GrossProfit	137.9us-gaap_GrossProfit
Depreciation and amortization	(90.0)	(48.2)
Goodwill	3,710.0us-gaap_Goodwill	3,821.6us-gaap_Goodwill	3,684.7us-gaap_Goodwill
Capital expenditures	153.5	67.9
Segment identifiable assets	10,892.5us-gaap_Assets		10,097.3us-gaap_Assets
Texas Operating Segment
Segment Reporting Information [Line Items]
Sales to external customers	70.7	48.3
Sales to affiliates	140.6	335.9
Purchased gas, NGLs, condensate and crude oil	(66.5)	(257.7)
Operating expenses	(48.5)	(31.7)
Gain on derivative activity	0	0
Segment profit	96.3	94.8
Depreciation and amortization	(36.5)	(27.2)
Goodwill	1,168.2	1,256.7	1,168.2
Capital expenditures	73.7	25.1
Segment identifiable assets	3,958.7		3,303.0
Louisiana Operating Segment
Segment Reporting Information [Line Items]
Sales to external customers	429.7	152.5
Sales to affiliates	11.9	0.5
Purchased gas, NGLs, condensate and crude oil	(376.4)	(140.5)
Operating expenses	(22.5)	(5.1)
Gain on derivative activity	0	0
Segment profit	42.7	7.4
Depreciation and amortization	(27.4)	(5.2)
Goodwill	786.8	885.1	786.8
Capital expenditures	17.8	22.1
Segment identifiable assets	3,175.7		3,316.5
Oklahoma Operating Segment
Segment Reporting Information [Line Items]
Sales to external customers	9.0	11.5
Sales to affiliates	34.9	162.9
Purchased gas, NGLs, condensate and crude oil	(3.4)	(133.8)
Operating expenses	(7.9)	(6.7)
Gain on derivative activity	0	0
Segment profit	32.6	33.9
Depreciation and amortization	(13.5)	(14.2)
Goodwill	190.3	190.3	190.3
Capital expenditures	5.4	10.2
Segment identifiable assets	883.4		892.8
Crude and Condensate
Segment Reporting Information [Line Items]
Sales to external customers	263.7	20.1
Sales to affiliates	0	0
Purchased gas, NGLs, condensate and crude oil	(235.5)	(14.3)
Operating expenses	(17.3)	(2.7)
Gain on derivative activity	0	0
Segment profit	10.9	3.1
Depreciation and amortization	(11.1)	(1.5)
Goodwill	137.8	106.0	112.5
Capital expenditures	52.3	5.0
Segment identifiable assets	1,036.7		762.5
Corporate Segment
Segment Reporting Information [Line Items]
Sales to external customers	0	0
Sales to affiliates	(24.4)	(7.4)
Purchased gas, NGLs, condensate and crude oil	24.4	7.4
Operating expenses	0	0
Gain on derivative activity	0.2	(1.3)
Segment profit	0.2	(1.3)
Depreciation and amortization	(1.5)	(0.1)
Goodwill	1,426.9	1,383.5
Capital expenditures	4.3	5.5
Segment identifiable assets	$ 1,838.0		$ 1,822.5

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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