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Partners' Capital and Distributions - Units Outstanding (Details) - shares	3 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Series A Preferred Units
Activity for preferred units and common units
Outstanding, beginning of period (units)	71,090,468	71,090,468	71,090,468	71,090,468	71,090,468	69,696,542
Issuance of Series A preferred units in connection with in-kind distribution (units)						1,393,926
Outstanding, end of period (units)	71,090,468	71,090,468	71,090,468	71,090,468	71,090,468	71,090,468
Series B Preferred Units
Activity for preferred units and common units
Outstanding, beginning of period (units)	800,000	800,000	800,000	800,000	800,000	800,000
Outstanding, end of period (units)	800,000	800,000	800,000	800,000	800,000	800,000
Common Units
Activity for preferred units and common units
Outstanding, beginning of period (units)	727,424,619	726,785,813	726,361,924	725,582,739	725,206,904	725,189,138
Issuances of common units under equity-indexed compensation plans	603,957	638,806	423,889	505,650	375,835	17,766
Outstanding, end of period (units)	728,028,576	727,424,619	726,785,813	726,088,389	725,582,739	725,206,904

X

- Definition

Number of units distributed for payment of a unit distribution to unit-holder of limited partnership (LP).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

The number of limited partner units outstanding.

+ References

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-Topic 505
-SubTopic 10
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- Definition

Number of units issued for unit-based payment arrangement issued by partnership. Partner includes, but is not limited to, general, limited and preferred partners.

+ References

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