Unitholders' Capital (Details) (USD $)	6 Months Ended
Jun. 30, 2011
Notes To Financial Statements [Abstract]
Sale of units, net of underwriting discounts and expenses of $26,315 (in shares)	16,726,067
Sale price of units of limited liability company interest (in dollars per share)	$ 38.80
Sale price of units of limited liability company interest, net of underwriting discount (in dollars per share)	$ 37.248
Sale of units, net of underwriting discounts and expenses of $26,315	$ 622,656,000
Underwriting discounts and expenses	26,315,000
Per unit cash dividend declared (in dollars per share)	$ 0.69
Percentage increase in quarterly distribution amount	5.00%
Estimated distribution payable in subsequent period	$ 122,000,000

Estimated amount of declared distribution payable in subsequent period

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- Details

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- Definition

The percentage increase in the distribution per share over the previous quarter.

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- Definition

Sale price of units of limited liability company interest

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- Definition

Sale price of units of limited liability company interest, net of underwriting discount

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- Definition

The amount of underwriting discounts and offering expenses netted against the proceeds from an equity offering.

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- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 32

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- Definition

Number of new stock issued during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
-Article 5

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Value of new stock issued during the period.

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