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v3.21.1

Partners' Capital and Distributions - Units Outstanding (Details) - shares | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Series A Preferred Units |  |
Activity for preferred units and common units |  |
Outstanding, beginning of period (units) | 71,090,468 | 71,090,468
Outstanding, end of period (units) | 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
Outstanding, end of period (units) | 800,000 | 800,000
Common Units |  |
Activity for preferred units and common units |  |
Outstanding, beginning of period (units) | 722,380,416 | 728,028,576
Repurchase and cancellation of common units under the Common Equity Repurchase Program (units) | (350,000) |
Issuances of common units under equity-indexed compensation plans (units) | 25,431 | 24,431
Outstanding, end of period (units) | 722,055,847 | 728,053,007

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