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Capital Accounts, Issuances of Equity (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Net Cash Proceeds from Sale of Common Units [Abstract] |  |  |  |  |  |
Common units issued in connection with the vesting of phantom unit awards, net (in units) | 115,665 | 203,066 | 3,553,313 |  |  |
Buyback Program: |  |  |  |  |  |
Total of common units repurchased under a buyback program (in units) | 3,367,377 |  | 709,816 |  |  |
Common units acquired in connection with buyback program | $ 74.9 |  |  | $ 33.7 | $ 88.8 | $ 173.8
Long-Term Incentive Plan (2008) [Member] |  |  |  |  |  |
Net Cash Proceeds from Sale of Common Units [Abstract] |  |  |  |  |  |
Common units issued in connection with the vesting of phantom unit awards, net (in units) |  |  |  |  | 3,872,044 |
2019 Buyback Program [Member] |  |  |  |  |  |
Buyback Program: |  |  |  |  |  |
Amount authorized under 2019 Buyback Program | 2,000.0 |  |  |  | $ 2,000.0 |
Remaining available capacity under the 2019 Buyback Program | $ 1,640.0 |  |  |  | $ 1,640.0 |
Total of common units repurchased under a buyback program (in units) | 3,367,377 |  |  | 1,984,507 | 4,077,193 | 8,342,246
Common units acquired in connection with buyback program | $ 74.9 |  |  | $ 33.7 | $ 88.8 | $ 173.8
At-the-Market Registration [Member] |  |  |  |  |  |
Registration Statements and Equity Offerings [Line Items] |  |  |  |  |  |
Maximum common units authorized for issuance | 2,540.0 |  |  |  | 2,540.0 |
Remaining units available for issuance | $ 2,540.0 |  |  |  | 2,540.0 |
Employee Unit Purchase Plan [Member] |  |  |  |  |  |
Net Cash Proceeds from Sale of Common Units [Abstract] |  |  |  |  |  |
Employer contribution to EUPP |  |  |  |  | $ 2.9 |
Distribution Reinvestment and Employee Unit Purchase Plans [Member] |  |  |  |  |  |
Net Cash Proceeds from Sale of Common Units [Abstract] |  |  |  |  |  |
Number of common units purchased on the open market and delivered to participants (in units) |  |  |  |  | 4,754,016 |

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- Definition The dollar value of the remaining amount of limited partner units available for issuance, after taking into account limited partner units issued to date. The limited partners are partners of a publicly traded limited partnership or master limited partnership. Limited partners have limited liability and do not manage the partnership. + References No definition available. + Details
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