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Subsequent Event	9 Months Ended
Subsequent Event	Sep. 30, 2013
Subsequent Event [Abstract]
Subsequent Event	Note 18. Subsequent Event On November 8, 2013, we issued 9,200,000 common units to the public (including an over-allotment amount of 1,200,000 common units) at an offering price of $62.05 per unit. This underwritten offering generated net proceeds of $553.4 million, which were used for general company purposes.