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Inventories | 9 Months Ended
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Sep. 30, 2016
Inventories |
Inventories | 5.Inventories Inventories consisted of the following (in millions):
|  | September 30, |  | December 31, |
|  | 2016 |  | 2015 |
Raw materials |  | $ | 156.5 |  | $ | 158.8 |
Work-in-process |  | 189.9 |  | 131.1 |
Finished goods |  | 99.1 |  | 93.3 |
Demonstration units |  | 37.6 |  | 38.8 |
Inventories |  | $ | 483.1 |  | $ | 422.0 |
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 September 30, 2016 and December 31, 2015, inventory-in-transit was $40.6 million and $44.7 million, respectively. The Company reduces the carrying value of its demonstration inventories for differences between its cost and estimated net realizable value through a charge to cost of product revenue that is based on a number of factors, including the age of the unit, the physical condition of the unit and an assessment of technological obsolescence. Amounts recorded in Cost of Revenue related to the write-down of demonstration units to net realizable value were $4.0 million and $5.1 million for the three months ended September 30, 2016 and 2015, respectively, and $12.5 million and $15.0 million for the nine months ended September 30, 2016 and 2015, 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 + Details
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