Inventories (Tables)

9 Months Ended

Sep. 30, 2014

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

	September 30, 2014		December 31, 2013
NGLs	$	973.4	$	593.8
Petrochemicals and refined products		338.7		395.1
Crude oil		238.8		42.6
Natural gas		38.6		61.6
Total	$	1,589.5	$	1,093.1

Cost of Sales and Lower of Cost or Market Adjustments

Due to fluctuating commodity prices, we recognize lower of cost or market adjustments when the carrying value of our available-for-sale inventories exceeds their net realizable value. 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 September 30,				For the Nine Months Ended September 30,
	2014		2013		2014		2013
Cost of sales (1)	$	10,455.1	$	10,371.3	$	32,213.1	$	29,522.1
Lower of cost or market adjustments		6.7		4.5		14.6		14.9

(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.