Inventories (Tables)

6 Months Ended

Jun. 30, 2012

Inventories [Abstract]

Inventory Amounts by Product Type

Our inventory amounts by product type were as follows at the dates indicated:

Available-for-Sale Inventory by Product Type	June 30, 2012		December 31, 2011
NGLs	$	553.4	$	563.6
Petrochemicals and refined products		246.1		443.4
Crude oil		46.5		39.2
Natural gas		46.9		65.5
Total	$	892.9	$	1,111.7

Cost of Sales and Lower of Cost or Market Adjustments

The following table presents our total cost of sales amounts and lower of cost or market adjustments for the periods indicated:

	For the Three Months Ended June 30,				For the Six Months Ended June 30,
	2012		2011		2012		2011
Cost of sales (1)	$	8,195.2	$	9,790.3	$	17,861.0	$	18,609.6
Lower of cost or market adjustments		8.0		0.5		13.9		1.7
(1) Cost of sales is a component of "Operating costs and expenses," as presented on our Unaudited Condensed Statements of Consolidated Operations. Period-to-period fluctuations in these amounts are primarily due to changes in energy commodity prices and sales volumes associated with our marketing activities.