4. Inventories

Inventories consisted of the following:


	March 31,		December 31,
	2019		2018
Retail automotive dealership new vehicles	$	2,400.9	$	2,397.0
Retail automotive dealership used vehicles		1,102.8		1,060.8
Retail automotive parts, accessories and other		130.3		140.8
Retail commercial truck dealership vehicles and parts		234.6		207.9
Commercial vehicle distribution vehicles, parts and engines		235.5		233.6
Total inventories	$	4,104.1	$	4,040.1

We receive credits from certain vehicle manufacturers that reduce cost of sales when the vehicles are sold. Such credits amounted to $12.1 million and $12.0 million during the three months ended March 31, 2019 and 2018, respectively.