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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
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Current assets: |  |
Allowance for doubtful accounts | $ 12.1 | $ 13.9
Accumulated amortization | $ 1,235.8 | $ 1,246.3
Limited partners: |  |
Capital account, units outstanding (in units) | 2,012,553,024 | 1,937,324,817

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