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Segment and Geographical Area Information, Net Sales by Product Categories (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012
Net Sales [Line Items] |  |
Net sales | $ 337.4 | $ 365.4
Aero/HS Products |  |
Net Sales [Line Items] |  |
Net sales | 179.6 | 184.7
GE Products |  |
Net Sales [Line Items] |  |
Net sales | 105.8 | 119.2
Automotive Extrusions |  |
Net Sales [Line Items] |  |
Net sales | 30.8 | 34.4
Other Products |  |
Net Sales [Line Items] |  |
Net sales | $ 21.2 | $ 27.1

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- Definition Amount of revenue from external customers for the reportable segment. Such disclosure is presented if the amount is: (a) included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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