Inventories (Tables)

12 Months Ended

Dec. 31, 2012

Inventories [Abstract]

Inventory Amounts by Product Type

Our available-for sale inventory amounts by product type were as follows at the dates indicated:

	December 31,
	2012		2011
NGLs	$	594.3	$	563.6
Petrochemicals and refined products		304.5		443.4
Crude oil		119.4		39.2
Natural gas		70.2		65.5
Total	$	1,088.4	$	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 Year Ended December 31,
	2012		2011		2010
Cost of sales (1)	$	36,015.5	$	38,292.6	$	28,723.1
Lower of cost or market adjustments	$	22.1	$	9.5	$	7.9
(1)   Cost of sales is a component of "Operating costs and expenses," as presented on our Statements of Consolidated Operations. Year-to-year fluctuations in these amounts are primarily due to changes in energy commodity prices and sales volumes associated with our marketing activities.