8.Inventories

Inventories consisted of the following (in millions):

	March 31,		December 31,
	2018		2017
Raw materials	$	161.1	$	152.0
Work-in-process	204.6		183.1
Finished goods	95.0		96.6
Demonstration units	57.3		54.5

Inventories	$	518.0	$	486.2

Finished goods include in-transit systems that have been shipped to the Company’s customers, but not yet installed and accepted by the customer. As of March 31, 2018 and December 31, 2017, the value of inventory-in-transit was $28.5 million and $41.4 million, respectively.