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Inventories (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Jan. 01, 2018 | Dec. 31, 2017
Inventory [Line Items] |  |  |  |
Raw materials and supplies | $ 175.7 |  |  | $ 162.8
Work-in-process | 931.8 |  |  | 955.5
Finished goods | 181.2 |  |  | 165.0
Total inventories at current cost | 1,288.7 |  |  | 1,283.3
Adjustment from current cost to LIFO cost basis | 23.1 |  |  | 43.1
Inventory valuation reserves | (101.0) |  |  | (121.5)
Progress payments | 0.0 |  |  | (28.8)
Total inventories, net | 1,210.8 |  |  | $ 1,176.1
LIFO benefit (charge) | (8.2) | $ (8.1) |  |
NRV benefit (charge) | 8.2 | 8.1 |  |
Net cost of sales impact | 0.0 | $ 0.0 |  |
ASU 2014-09 |  |  |  |
Inventory [Line Items] |  |  |  |
Inventory valuation reserves |  |  | $ 11.8 |
Total inventories, net | $ 23.5 |  | $ 28.8 |

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