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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
ASSETS |  |
Accounts receivable, allowance for doubtful accounts | $ 12.1 | $ 11.3
Intangible assets, accumulated amortization | $ 1,564.8 | $ 1,403.1
Limited partners: |  |
Common units outstanding (in units) | 2,161,089,479 | 2,117,588,414

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