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UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Current assets: |  |
Accounts receivable, allowance for doubtful accounts | $ 11.6 | $ 11.5
Intangible assets, accumulated amortization | $ 1,779.3 | $ 1,735.1
Limited partners: |  |
Common units outstanding (in units) | 2,188,560,672 | 2,184,869,029

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