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Inventories Schedule of Inventory (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Inventory, Gross [Abstract]
Raw materials and supplies	$ 207.6	$ 164.9
Work-in-process	690.7	899.6
Finished goods	181.6	161.3
Total inventories at current cost	1,079.9	1,225.8
Adjustment from current cost to LIFO cost basis	44.1	33.6
Inventory valuation reserves	(126.9)	(104.1)
Total inventories, net	$ 997.1	$ 1,155.3

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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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Gross amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed.

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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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