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Partners' Capital and Distributions - Equity Offerings (Details) $ / shares in Units, shares in Millions, $ in Millions |  | 9 Months Ended
--- | --- | ---
Jan. 28, 2016 $ / shares shares | Sep. 30, 2016 USD ($) item $ / shares shares
Series A Preferred Units | Limited Partners |  |
Partners Capital and Distributions |  |
Sale of preferred units (units) | shares | 61.0 |
Cash purchase price (usd per unit) | $ / shares | $ 26.25 |
Quarterly distribution rate (usd per unit) | $ / shares |  | $ 0.525
Annualized distribution rate (usd per unit) | $ / shares |  | $ 2.10
Preferred unit conversion ratio |  | 1
Common unit closing price as a percentage of Issue Price, over which the entity has conversion option |  | 150.00%
Period for closing price of common units to be above threshold, to trigger conversion option |  | 20 days
Series A Preferred Units | Limited Partners | Preferred Distribution Rate Reset Option |  |
Partners Capital and Distributions |  |
Period after fifth and subsequent anniversaries of issuance for distribution rate reset election option |  | 30 days
Number of distribution rate reset elections allowed | item |  | 1
Basis spread on variable rate |  | 5.85%
Period after sixth anniversary of issuance, after which units may be redeemed if distribution rate has been reset |  | 30 days
Value of common units if exchanged for redemption of preferred units, as a percentage of volume-weighted average price |  | 95.00%
Redemption price as a percentage of Issue Price |  | 110.00%
Continuous Offering Program |  |
Partners Capital and Distributions |  |
Sale of common units (units) | shares |  | 9.9
Sale of common units, net proceeds | $ |  | $ 289
Commissions paid to sales agents | $ |  | 2
Continuous Offering Program | General Partner |  |
Partners Capital and Distributions |  |
General partners' proportionate capital contributions | $ |  | $ 6

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- Definition The percentage of the volume-weighted average price of the partnership's common units for a specified trading period, at which such common units are valued if given in exchange for the redemption of the preferred units. + References No definition available. + Details
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- Definition The closing price of the partnership's common units as a percentage of the Issue Price of the preferred units that must be exceeded for a certain period of days in order for the entity to convert the preferred units, subject to minimum time requirements and certain minimum conversion amounts. + References No definition available. + Details
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