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Inventories, net - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Inventories, net additional information |  |  |
Charges to cost of sales due to lower of cost or market value | $ 2.2 | $ 8.1 | $ 0.8
Inventory on consignment at customer locations | 4.6 | 3.6 |
Inventory reserves |  |  |
Inventories, net additional information |  |  |
Increase in inventory reserves | 0.3 |  |
Inventory reserves | $ 13.9 | $ 14.2 |

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- Definition Gross amount of inventory owned by the entity but in the hands of a customer, typically a reseller. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.A.2.Q2 Response) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 Reference 2: 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(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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