Inventories (Tables)

12 Months Ended

Dec. 31, 2014

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

	December 31,
	2014		2013
NGLs	$	579.1	$	593.8
Petrochemicals and refined products		295.6		395.1
Crude oil		97.8		42.6
Natural gas		41.7		61.6
Total	$	1,014.2	$	1,093.1

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

	For the Year Ended December 31,
	2014			2013			2012
Cost of sales (1)		$	40,464.1		$	40,770.2		$	36,015.5
Lower of cost or market adjustments			22.8			18.5			22.1
(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.