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Business Segments - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |
Restructuring charges |  |  | $ 527.2 | $ 64.3 | $ 0.0
Total direct international sales |  |  | 1,277.1 | 1,577.0 | 1,607.5
Sales by U.S. operations to foreign countries |  |  | 971.4 | 1,215.8 | 1,201.8
LIFO-related net realizable value charge |  | $ (136.4) | (97.3) | (136.4) |
Inventory valuation reserves |  | 206.3 | 169.0 | 206.3 |
Closed operations and other expenses |  |  | 34.6 | 22.1 | 28.3
Closed operations environmental costs |  |  | 5.8 | 4.5 | 8.0
Closed operations insurance obligations |  |  |  |  | 3.8
Other corporate expense |  |  | 23.8 | 15.3 | 9.4
Flat Rolled Products [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Increase (Decrease) in Assets |  |  | (32.0) |  |
Income (loss) from equity method investments |  |  | 0.5 | (0.1) | (8.9)
High Performance Materials & Components [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Increase (Decrease) in Assets |  |  | $ (521.0) |  |
STAL Precision Stainless Steel Company Limited [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Joint venture ownership percentage |  |  | 60.00% |  |
Uniti [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Equity method investment ownership percentage |  |  | 50.00% |  |
Revenue from related parties |  |  | $ 20.3 | 55.4 | 75.3
Uniti [Member] | VSMPO [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Joint venture ownership percentage by unaffiliated entity |  |  | 50.00% |  |
Corporate, Non-Segment [Member] | Closed Company and Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Retirement Benefit Expense |  |  | $ 5.0 | 2.3 | $ 7.1
Inventory Valuation Reserve [Member] | Titanium Sponge Inventory [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Inventory valuation charges | $ 11.3 |  | 11.3 |  |
Inventory Valuation Reserve [Member] | Non-PQ grade titanium sponge [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Inventory valuation charges |  |  |  | 25.4 |
Employee benefit costs [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Restructuring charges |  |  | 24.2 |  |
Employee benefit costs [Member] | Flat Rolled Products [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Restructuring charges |  |  | 4.9 |  |
Employee benefit costs [Member] | High Performance Materials & Components [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Restructuring charges |  |  | 7.5 |  |
Long-Lived Asset Impairment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Restructuring charges |  |  | 471.3 |  |
Asset Impairment Charges |  |  |  | $ 54.5 |
Facility Closing [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Restructuring charges |  | $ 3.5 | 31.7 |  |
Facility Closing [Member] | Flat Rolled Products [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Restructuring charges |  |  | 8.4 |  |
Facility Closing [Member] | High Performance Materials & Components [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Restructuring charges |  |  | $ 23.8 |  |

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