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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Current assets: |  |
Allowance for doubtful accounts | $ 7.5 | $ 13.2
Accumulated amortization | $ 1,150.0 | $ 1,050.0
Common units [Member] |  |
Limited partners: |  |
Capital account, units outstanding (in units) | 935,685,008 | 898,813,337
Class B units [Member] |  |
Limited partners: |  |
Capital account, units outstanding (in units) | 0 | 4,520,431

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