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Business Segments - Narrative (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |
Total direct international sales | $ 1,585.1 | $ 1,705.7 | $ 1,709.4
Sales by U.S. operations to foreign countries | 1,175.1 | 1,262.9 | 1,313.9
Closed company and other expense | 14.2 | 18.5 | 9.9
Closed companies environmental costs | 3.9 | 4.3 | 4.9
Other corporate expense | 10.3 | 10.2 | 5.0
Closed companies real estate costs |  | 4.0 |
Former Engineered Products Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Percent of total revenue | 3.00% |  |
Flat-Rolled Products [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Income (loss) from equity method investments | (7.1) | 4.9 | 7.4
Inventory valuation reserves | 20.5 |  |
Flat-Rolled Products and High Performance Metals [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Inventory valuation reserves | 55.5 |  |
High Performance Metals [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Inventory valuation reserves | 35.0 |  |
Corporate Joint Venture [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Equity method investment ownership percentage | 50.00% |  |
Revenue from related parties | $ 95.9 | $ 77.1 | $ 149.1
STAL Precision Stainless Steel Company Limited [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Joint venture ownership percentage | 60.00% |  |

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