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Partners' Capital and Distributions - Activity for Series A and B Preferred Units and Common Units (Details) - shares | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Series A Preferred Units |  |  |
Increase (Decrease) in Partners' Capital [Roll Forward] |  |  |
Balance, beginning of period (in units) | 71,090,468 |  |
Balance, end of period (in units) | 71,090,468 | 71,090,468 |
Series B Preferred Units |  |  |
Increase (Decrease) in Partners' Capital [Roll Forward] |  |  |
Balance, beginning of period (in units) | 800,000 |  |
Balance, end of period (in units) | 800,000 | 800,000 |
Common Units |  |  |
Increase (Decrease) in Partners' Capital [Roll Forward] |  |  |
Balance, beginning of period (in units) | 722,380,416 |  |
Balance, end of period (in units) | 704,991,540 | 722,380,416 |
Limited Partners | Series A Preferred Units |  |  |
Increase (Decrease) in Partners' Capital [Roll Forward] |  |  |
Balance, beginning of period (in units) | 71,090,468 | 71,090,468 | 71,090,468
Balance, end of period (in units) | 71,090,468 | 71,090,468 | 71,090,468
Limited Partners | Series B Preferred Units |  |  |
Increase (Decrease) in Partners' Capital [Roll Forward] |  |  |
Balance, beginning of period (in units) | 800,000 | 800,000 | 800,000
Balance, end of period (in units) | 800,000 | 800,000 | 800,000
Limited Partners | Common Units |  |  |
Increase (Decrease) in Partners' Capital [Roll Forward] |  |  |
Balance, beginning of period (in units) | 722,380,416 | 728,028,576 | 726,361,924
Repurchase and cancellation of common units under the Common Equity Repurchase Program (in units) | (18,061,583) | (6,222,748) |
Issuance of common units under equity-indexed compensation plans (in units) | 672,707 | 574,588 | 1,666,652
Balance, end of period (in units) | 704,991,540 | 722,380,416 | 728,028,576

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