3. Inventories

Inventories consisted of the following:


	June 30,		December 31,
	2018		2017
Retail automotive dealership new vehicles	$	2,298.8	$	2,344.1
Retail automotive dealership used vehicles		1,014.8		993.1
Retail automotive parts, accessories and other		124.8		141.7
Retail commercial truck dealership vehicles and parts		226.3		207.0
Commercial vehicle distribution vehicles, parts and engines		230.4		258.2
Total inventories	$	3,895.1	$	3,944.1

We receive credits from certain vehicle manufacturers that reduce cost of sales when the vehicles are sold. Such credits amounted to $13.6 million and $10.6 million during the three months ended June 30, 2018 and 2017, respectively, and $25.6 million and $20.7 million during the six months ended June 30, 2018 and 2017, respectively.