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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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ASSETS |  |
Accounts receivable, allowance for doubtful accounts | $ 11.5 | $ 12.1
Intangible assets, accumulated amortization | $ 1,735.1 | $ 1,564.8
Limited partners: |  |
Common units outstanding (in units) | 2,184,869,029 | 2,161,089,479

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