3. Inventories

Inventories consisted of the following:


	September 30,		December 31,
	2018		2017
Retail automotive dealership new vehicles	$	2,143.2	$	2,344.1
Retail automotive dealership used vehicles		1,042.4		993.1
Retail automotive parts, accessories and other		126.3		141.7
Retail commercial truck dealership vehicles and parts		245.9		207.0
Commercial vehicle distribution vehicles, parts and engines		225.6		258.2
Total inventories	$	3,783.4	$	3,944.1

We receive credits from certain vehicle manufacturers that reduce cost of sales when the vehicles are sold. Such credits amounted to $15.1 million and $15.7 million during the three months ended September 30, 2018 and 2017, respectively, and $40.7 million and $40.2 million during the nine months ended September 30, 2018 and 2017, respectively.