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Business Segments - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |
Total direct international sales |  | $ 1,577.0 | $ 1,607.5 | $ 1,585.1
Sales by U.S. operations to foreign countries |  | 1,215.8 | 1,201.8 | 1,175.1
LIFO-related net realizable value charge | $ (136.4) | (136.4) | (4.8) |
Inventory valuation reserves | 206.3 | 206.3 | 68.8 |
Closed company and other expense |  | 22.1 | 28.3 | 30.9
Closed companies environmental costs |  | 4.5 | 8.0 | 3.9
Closed companies insurance obligations |  |  | 3.8 |
Other corporate expense |  | 15.3 | 9.4 | 10.3
Asset Impairment Charges | $ 54.5 |  |  | 55.1
Flat Rolled Products [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income (loss) from equity method investments |  | $ (0.1) | (8.9) | (7.1)
High Performance Materials & Components [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Asset Impairment Charges |  |  |  | 8.0
STAL Precision Stainless Steel Company Limited [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Joint venture ownership percentage | 60.00% | 60.00% |  |
Corporate Joint Venture [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Equity method investment ownership percentage | 50.00% | 50.00% |  |
Revenue from related parties |  | $ 55.4 | 75.3 | 95.9
Corporate Joint Venture [Member] | VSMPO [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Joint venture ownership percentage by unaffiliated entity | 50.00% | 50.00% |  |
Corporate, Non-Segment [Member] | Closed Company and Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Retirement Benefit Expense |  | $ 2.3 | $ 7.1 | $ 16.7
Inventory Valuation Reserve [Member] | Non-PQ grade titanium sponge [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Lower of cost or market charges | $ (25.4) |  |  |

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