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Inventories | 3 Months Ended
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Mar. 31, 2020
Inventories |
Inventories | 8. Inventories ​ Inventories consisted of the following (dollars in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, |  | December 31,
​ |  | 2020 |  | 2019
Raw materials | ​ | $ | 194.9 | ​ | $ | 188.8
Work-in-process | ​ |  | 236.6 | ​ |  | 206.4
Finished goods | ​ |  | 115.0 | ​ |  | 104.5
Demonstration units | ​ |  | 79.0 | ​ |  | 77.5
Inventories | ​ | $ | 625.5 | ​ | $ | 577.2
​ Finished goods include in-transit systems that have been shipped to the Company's customers for which control has not passed to the customers as the systems were not installed and accepted by the customer. As of March 31, 2020, and December 31, 2019, the value of inventory-in-transit was $37.4 million and $36.0 million, respectively.

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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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