Subsequent Events	6 Months Ended
Subsequent Events	Jun. 30, 2012
Subsequent Events [Abstract]
Subsequent Events	13. Subsequent Events Recognizable events No recognizable events occurred during the period. Non-recognizable events In July 2012, we entered into an additional $150.0 million of forward-starting interest rate swap agreements to hedge against the variability of future interest payments on debt that we anticipate issuing between December 1, 2013 and December 1, 2014 to refinance our 6.45% notes due June 1, 2014. Including the $100.0 million of interest rate swap agreements entered into in June 2012 (see Note 7—Derivative Financial Instruments), we have fully hedged the $250.0 million of notes we expect to issue. Under the terms of these agreements, we will pay a weighted-average fixed interest rate of 2.6% and receive LIBOR. The hedges have a 30-year maturity, which matches the expected maturity of the anticipated debt issuance. We account for these agreements as cash flow hedges. In July 2012, we received a payment of $2.4 million on the amount owed to us by MF Global (see Note 8—Commitments and Contingencies), resulting in a remaining balance owed to us of $5.8 million. In July 2012, our general partner's board of directors declared a quarterly distribution of $0.9425 per unit to be paid on August 14, 2012 to unitholders of record at the close of business on August 7, 2012. The total cash distributions to be paid are $106.6 million.

Tabular disclosure of significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, losses resulting from fire or flood, losses on receivables, significant realized and unrealized gains and losses that result from changes in quoted market prices of securities, declines in market prices of inventory, changes in authorized or issued debt (SEC), significant foreign exchange rate changes, substantial loans to insiders or affiliates, significant long-term investments, and substantial dividends not in the ordinary course of business.

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