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UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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Current assets: |  |
Accounts receivable, allowance for credit losses | $ 50.0 | $ 46.5
Redeemable preferred limited partner interests: |  |
Series A cumulative convertible preferred units outstanding (in units) | 50,412 | 50,138
Partners' equity: |  |
Common units issued (in units) | 2,182,129,957 | 2,182,308,958
Common units outstanding (in units) | 2,182,129,957 | 2,182,308,958

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