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Financial Information for Subsidiary and Guarantor Parent Financial Information for Subsidiary and Guarantor Parent (Narrative) (Details) (Allegheny Ludlum 6.95% debentures due 2025, USD $) In Millions, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Allegheny Ludlum 6.95% debentures due 2025 |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | $ 150.0 | $ 150.0
Interest rate | 6.95% |

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