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Inventories (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Inventory [Line Items] |  |  |  |  |
Raw materials and supplies | $ 194.1 |  | $ 194.1 |  | $ 191.5
Work-in-process | 917.8 |  | 917.8 |  | 914.1
Finished goods | 182.7 |  | 182.7 |  | 191.1
Total inventories at current cost | 1,294.6 |  | 1,294.6 |  | 1,296.7
Adjustment from current cost to LIFO cost basis | 13.9 |  | 13.9 |  | 2.9
Inventory valuation reserves | (91.0) |  | (91.0) |  | (88.5)
Total inventories, net | 1,217.5 |  | 1,217.5 |  | 1,211.1
LIFO benefit (charge) |  |  | 5.8 | $ (27.5) |
NRV benefit (charge) |  |  | (5.9) | 27.5 |
Net cost of sales impact | 0.0 | $ 0.0 | (0.1) | $ 0.0 |
Net Realizable Value Reserve [Member] |  |  |  |  |
Inventory [Line Items] |  |  |  |  |
Inventory valuation reserves | (13.9) |  | (13.9) |  | $ (8.0)
Forged Products |  |  |  |  |
Inventory [Line Items] |  |  |  |  |
Adjustment from current cost to LIFO cost basis | $ 5.2 |  | $ 5.2 |  |

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