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Inventories (Tables) | 6 Months Ended
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Jun. 30, 2017
Inventory Disclosure [Abstract] |
Schedule of Inventories | Inventories at June 30, 2017 and December 31, 2016 were as follows (in millions):
| June 30, 2017 |  | December 31, 2016
Raw materials and supplies | $ | 141.6 |  |  | $ | 149.6 |
Work-in-process | 886.7 |  |  | 837.9 |
Finished goods | 159.4 |  |  | 161.7 |
Total inventories at current cost | 1,187.7 |  |  | 1,149.2 |
Adjustment from current cost to LIFO cost basis | 79.1 |  |  | 97.3 |
Inventory valuation reserves | (150.2 | ) |  | (169.0 | )
Progress payments | (40.4 | ) |  | (40.5 | )
Total inventories, net | $ | 1,076.2 |  |  | $ | 1,037.0 |
Schedule of Inventory Valuation Impact on Income | Impacts to cost of sales for changes in the LIFO costing methodology and associated NRV inventory reserves were as follows (in millions):
|  | Six months ended June 30,
|  | 2017 |  | 2016
LIFO benefit (charge) |  | $ | (18.2 | ) |  | $ | (4.6 | )
NRV benefit (charge) |  | 18.1 |  |  | 5.0 |
Net cost of sales impact |  | $ | (0.1 | ) |  | $ | 0.4 |

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