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Condensed Consolidated Statements of Operations (parenthetical) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Affiliate purchased gas, NGLs, condensate and crude $ 657.4us-gaap_CostOfPurchasedOilAndGas $ 538.9us-gaap_CostOfPurchasedOilAndGas
Affiliate general and administrative expense 42.9us-gaap_GeneralAndAdministrativeExpense 15.7us-gaap_GeneralAndAdministrativeExpense
Affiliated Entity [Member]    
Affiliate purchased gas, NGLs, condensate and crude 7.9us-gaap_CostOfPurchasedOilAndGas
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember		 325.8us-gaap_CostOfPurchasedOilAndGas
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
Affiliate operating expenses 0us-gaap_OperatingExpenses
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember		 5.9us-gaap_OperatingExpenses
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
Affiliate general and administrative expense $ 0us-gaap_GeneralAndAdministrativeExpense
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember		 $ 8.3us-gaap_GeneralAndAdministrativeExpense
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember