INVENTORIES (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Inventory Disclosure [Abstract]
Supplies	$ 107.6	$ 105.6	$ 99.4
Raw materials	86.4	69.2	60.9
Work in process	96.3	120.9	123.1
Finished goods	363.8	449.5	474.9
Inventories excluding LIFO reserve	654.1	745.2	758.3
LIFO reserve	(45.7)	(49.5)	(57.6)
Inventories, net	$ 608.4	$ 695.7	$ 700.7

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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Amount by which inventory stated at last-in first-out (LIFO) is less than (in excess of) inventory stated at other inventory cost methods.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of other supplies used within the manufacturing or production process expected to be consumed within one year or operating cycle, if longer.

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