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UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Current assets: |  |
Accounts receivable, allowance for doubtful accounts | $ 6.7 | $ 13.2
Intangible Assets, accumulated amortization | $ 1,124.6 | $ 1,050.0
Common units [Member] |  |
Limited partners: |  |
Capital account, units outstanding (in units) | 924,770,538 | 898,813,337
Class B units [Member] |  |
Limited partners: |  |
Capital account, units outstanding (in units) |  | 4,520,431

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