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Partners' Capital and Distributions - Units Outstanding (Details) - shares | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021
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
Outstanding, end of period (units) | 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
Outstanding, end of period (units) | 800,000 | 800,000 | 800,000 | 800,000 | 800,000
Common Units |  |  |  |  |
Activity for preferred units and common units |  |  |  |  |
Outstanding, beginning of period (units) | 722,055,847 | 722,380,416 | 728,053,007 | 728,028,576 | 722,380,416
Repurchase and cancellation of common units under the Common Equity Repurchase Program (units) | (4,940,592) | (350,000) |  |  |
Issuances of common units under equity-indexed compensation plans (units) | 256,321 | 25,431 | 47,391 | 24,431 |
Outstanding, end of period (units) | 717,371,576 | 722,055,847 | 728,100,398 | 728,053,007 | 717,371,576

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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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=120397183&loc=d3e187085-122770 + Details
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