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Inventories (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |
Raw materials and supplies |  |  | $ 162.8 | $ 149.6 |
Work-in-process |  |  | 955.5 | 837.9 |
Finished goods |  |  | 165.0 | 161.7 |
Total inventories at current cost |  |  | 1,283.3 | 1,149.2 |
Adjustment from current cost to LIFO cost basis |  |  | 43.1 | 97.3 |
Inventory valuation reserves |  |  | (121.5) | (169.0) |
Progress payments |  |  | (28.8) | (40.5) |
Total inventories, net |  |  | 1,176.1 | 1,037.0 |
LIFO Inventory Amount |  |  | 821.2 | 736.3 |
Inventory, LIFO Reserve, Effect on Income, Net [Abstract] |  |  |  |  |
LIFO benefit (charge) |  |  | (54.2) | (39.1) | $ 131.6
NRV benefit (charge) |  |  | 54.0 | 39.9 | (131.5)
Net cost of sale impact |  |  | (0.2) | 0.8 | 0.1
Effect of LIFO liquidation on income |  |  | $ 4.6 | 61.5 | 9.6
Industrial titanium products [Member] | Inventory Valuation Reserve [Member] |  |  |  |  |
Inventory, LIFO Reserve, Effect on Income, Net [Abstract] |  |  |  |  |
Inventory valuation charges |  |  |  | $ 17.7 | $ 24.5
Titanium sponge inventory [Member] | Inventory Valuation Reserve [Member] |  |  |  |  |
Inventory, LIFO Reserve, Effect on Income, Net [Abstract] |  |  |  |  |
Inventory valuation charges | $ 11.3 |  |  |  |
Non-PQ grade titanium sponge [Member] | Inventory Valuation Reserve [Member] |  |  |  |  |
Inventory, LIFO Reserve, Effect on Income, Net [Abstract] |  |  |  |  |
Inventory valuation charges |  | $ 25.4 |  |  |

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- Definition The effect of liquidating LIFO (last in first out) inventory layers on income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(c)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SAB Topic 11.F) -URI http://asc.fasb.org/extlink&oid=27011343&loc=d3e100079-122729 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section S99 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=27011343&loc=d3e100079-122729 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section S50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6386917&loc=d3e99609-122727 + Details
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