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Inventories (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jan. 01, 2018 | Dec. 31, 2017
Inventory [Line Items] |  |  |  |  |  |
Raw materials and supplies | $ 204.3 |  | $ 204.3 |  |  | $ 162.8
Work-in-process | 929.9 |  | 929.9 |  |  | 955.5
Finished goods | 190.0 |  | 190.0 |  |  | 165.0
Total inventories at current cost | 1,324.2 |  | 1,324.2 |  |  | 1,283.3
Adjustment from current cost to LIFO cost basis | 1.7 |  | 1.7 |  |  | 43.1
Inventory valuation reserves | (86.1) |  | (86.1) |  |  | (121.5)
Progress payments | 0.0 |  | 0.0 |  |  | (28.8)
Total inventories, net | 1,239.8 |  | 1,239.8 |  |  | 1,176.1
LIFO benefit (charge) |  |  | (29.5) | $ (51.5) |  |
NRV benefit (charge) |  |  | 29.5 | 51.3 |  |
Net cost of sales impact | 0.0 | $ (0.1) | 0.0 | $ (0.2) |  |
ASU 2014-09 |  |  |  |  |  |
Inventory [Line Items] |  |  |  |  |  |
Adjustment from current cost to LIFO cost basis |  |  |  |  | $ (11.8) |
Inventory valuation reserves |  |  |  |  | 11.8 |
Total inventories, net | 14.2 |  | 14.2 |  | 28.8 |
Net Realizable Value Reserve [Member] |  |  |  |  |  |
Inventory [Line Items] |  |  |  |  |  |
Inventory valuation reserves | (6.2) |  | (6.2) |  |  | $ (47.5)
Revenue Recognized Over-time | ASU 2014-09 |  |  |  |  |  |
Inventory [Line Items] |  |  |  |  |  |
Total inventories, net | $ 4.1 |  | $ 4.1 |  | $ (34.2) |

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