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Partners' Capital and Distributions (Narrative) (Details) $ in Millions | Jul. 27, 2016 USD ($) $ / units shares | Jul. 22, 2015 USD ($) | Jun. 30, 2016 shares | Dec. 31, 2015 shares
--- | --- | --- | --- | ---
Partners Capital And Distributions [Line Items] |  |  |  |
Limited Partners' Capital Account, Units Outstanding |  |  | 109,979,218 | 109,979,218
Public sale of units net of offering costs | $ |  | $ 437.2 |  |
Class A [Member] | Limited Partner |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |
Limited Partners' Capital Account, Units Outstanding |  |  | 109,939,221 |
Class A [Member] | Subsequent Event | Limited Partner |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |
Common units, issued | 8,000,000 |  |  |
Unit price | $ / units | 37.90 |  |  |
Option to purchase additional units, period | 30 days |  |  |
Option to purchase additional units (in units) | 1,200,000 |  |  |
Public sale of units net of offering costs | $ | $ 298.0 |  |  |
Class B [Member] | Limited Partner |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |
Limited Partners' Capital Account, Units Outstanding |  |  | 39,997 |

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- Definition The number of limited partner units outstanding. + 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 + Details
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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 FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 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 + Details
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