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Segment and Geographical Area Information, Net Sales by End Market Segment Applications (Details) - Fabricated Products - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Net Sales: |  |
Net sales | $ 355.3 | $ 343.2
Aero/HS products |  |
Net Sales: |  |
Net sales | 167.5 | 176.9
Automotive Extrusions |  |
Net Sales: |  |
Net sales | 53.0 | 48.4
GE products |  |
Net Sales: |  |
Net sales | 123.2 | 105.4
Other products |  |
Net Sales: |  |
Net sales | $ 11.6 | $ 12.5

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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