Inventories - Additional Information (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Inventory [Line Items]
Inventories classified as assets held for sale		$ 24.7
Percentage of LIFO inventory	10.00%	17.00%
Inventories stated on LIFO basis	$ 69.2	$ 99.6
Excess of replacement costs over stated LIFO value	32.8	33.1
Lithium
Inventory [Line Items]
Work in process related to Lithium	$ 71.4	$ 59.6

Amount classified as inventory attributable to disposal group held for sale or disposed of.

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The excess of replacement or current cost over the stated LIFO (last in first out) inventory value when the LIFO inventory method is utilized.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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The amount of LIFO (last in first out) inventory present at the reporting date when inventory is also valued using different valuation methods.

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The percentage of LIFO (last in first out) inventory to total inventory as of the balance sheet date if other than 100 percent.

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