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v2.4.1.9

Subsequent Event (Details) (USD $) In Millions, except Share data, unless otherwise specified | 0 Months Ended |  |
--- | --- | --- | ---
Apr. 10, 2015 | Mar. 31, 2015 | Dec. 31, 2014
Subsequent Event [Line Items] |  |  |
Common units, issued |  | 95,029,218 us-gaap_LimitedPartnersCapitalAccountUnitsIssued | 95,029,218 us-gaap_LimitedPartnersCapitalAccountUnitsIssued
Subsequent Event [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Common units, issued | 4,600,000 us-gaap_LimitedPartnersCapitalAccountUnitsIssued / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |
Sale of Stock, Price Per Share | $ 44.42 us-gaap_SaleOfStockPricePerShare / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |
Partners' Capital Account, Public Sale of Units Net of Offering Costs | $ 198 us-gaap_PartnersCapitalAccountPublicSaleOfUnitsNetOfOfferingCosts / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |

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- Definition The number of limited partner units issued. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB TOPIC 4.F) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section F + Details
Name: | us-gaap_LimitedPartnersCapitalAccountUnitsIssued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Monetary value of the issuance of new units of limited partnership interest in a public offering, net of offering costs. This is a parenthetical disclosure. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockPricePerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |