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Inventories - Additional Information (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Inventory [Line Items]    
Percentage of LIFO inventory 8.00% 10.00%
Inventories stated on LIFO basis $ 62.2 $ 78.7
Excess of replacement costs over stated LIFO value 29.7 30.8
Lithium    
Inventory [Line Items]    
Work in process related to Lithium $ 129.6 $ 109.3