Annual report pursuant to Section 13 and 15(d)

Inventories - Narrative (Details)

v3.20.4
Inventories - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]      
Change in accounting principle effect on inventory $ 5,200,000 $ 4,700,000  
Inventory Valuation Reserves 7,000,000.0 6,600,000  
Inventory write down $ 0 $ 13,600,000 $ 0