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Inventories, net - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Inventories, net additional information      
Charges to cost of sales due to lower of cost or market value $ 2.8 $ 2.2 $ 8.1
Inventory on consignment at customer locations 5.0 4.6  
Inventory reserves      
Inventories, net additional information      
Decrease in inventory reserve 5.7    
Inventory reserves $ 8.2 $ 13.9