6. Inventories

Inventories consisted of the following:


	December 31,
	2018		2017
Retail automotive dealership new vehicles	$	2,397.0	$	2,344.1
Retail automotive dealership used vehicles		1,060.8		993.1
Retail automotive parts, accessories and other		140.8		141.7
Retail commercial truck dealership vehicles and parts		207.9		207.0
Commercial vehicle distribution vehicles, parts and engines		233.6		258.2
Total inventories	$	4,040.1	$	3,944.1

We receive credits from certain vehicle manufacturers that reduce cost of sales when the vehicles are sold. Such credits amounted to $54.6 million, $55.4 million, and $51.6 million during the years ended December 31, 2018, 2017, and 2016, respectively.