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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Current assets: |  |
Allowance for doubtful accounts | $ 13.2 | $ 13.4
Accumulated amortization | $ 1,050.0 | $ 990.4
Common units [Member] |  |
Limited partners: |  |
Capital account, units outstanding (in units) | 898,813,337 | 881,620,418
Class B units [Member] |  |
Limited partners: |  |
Capital account, units outstanding (in units) | 4,520,431 | 4,520,431

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