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Inventories Schedule of Inventory (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Inventory, Gross [Abstract] |  |
Raw materials and supplies | $ 191.5 | $ 162.8
Work-in-process | 914.1 | 955.5
Finished goods | 191.1 | 165.0
Total inventories at current cost | 1,296.7 | 1,283.3
Adjustment from current cost to LIFO cost basis | 2.9 | 43.1
Inventory valuation reserves | (88.5) | (121.5)
Progress payments | 0.0 | (28.8)
Total inventories, net | $ 1,211.1 | $ 1,176.1

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