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UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions | Jun. 30, 2016 | Dec. 31, 2015
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Current assets: |  |
Accounts receivable, allowance for doubtful accounts | $ 10.7 | $ 12.1
Intangible assets, accumulated amortization | $ 1,324.8 | $ 1,235.8
Limited partners: |  |
Capital account, units outstanding (in units) | 2,092,325,330 | 2,012,553,024

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