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Inventories Schedule of Inventory (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Inventory, Gross [Abstract] |  |
Raw materials and supplies | $ 164.9 | $ 191.5
Work-in-process | 899.6 | 914.1
Finished goods | 161.3 | 191.1
Total inventories at current cost | 1,225.8 | 1,296.7
Adjustment from current cost to LIFO cost basis | 33.6 | 2.9
Inventory valuation reserves | (104.1) | (88.5)
Progress payments | 0.0 | 0.0
Total inventories, net | $ 1,155.3 | $ 1,211.1

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