FINANCIAL INSTRUMENTS (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2011	Dec. 31, 2010
FINANCIAL INSTRUMENTS
Fair value of the Partnership's long-term debt	$ 694.8	$ 513.9
Interest Rate Derivatives
Amount of variable-rate debt hedged	300.0	375.0
Interest rate swap through December 12, 2011
Interest Rate Derivatives
Amount of variable-rate debt hedged	300.0
Weighted average fixed interest rate paid (as a percent)	4.89%
Interest rate swap through February 28, 2011
Interest Rate Derivatives
Amount of variable-rate debt hedged	$ 75.0
Fixed interest rate paid (as a percent)	3.86%

Amount of the hedged item as of the balance sheet date related to the derivative. For example, the hedged balance on a debt instrument.

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- Definition

Average fixed interest rate related to the group of interest rate derivatives.

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- Definition

Fixed interest rate related to the interest rate derivative.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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