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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

X

- Definition

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-Paragraph 2

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- Definition

The number of limited partner units outstanding.

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-Name Accounting Standards Codification

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