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UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
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Current assets: |  |
Accounts receivable, allowance for doubtful accounts | $ 11.4 | $ 12.1
Intangible assets, accumulated amortization | $ 1,607.9 | $ 1,564.8
Limited partners: |  |
Common units outstanding (in units) | 2,171,412,794 | 2,161,089,479

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