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Segment and Geographical Area Information, Schedule of net sales by end market segment applications (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Revenue from External Customer |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 316.6 | $ 336.4 | $ 367.2 | $ 371.7 | $ 338.0 | $ 338.9 | $ 344.1 | $ 335.1 | $ 1,391.9 | $ 1,356.1 | $ 1,297.5
Aero/HS products |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 695.5 | 686.3 | 677.0
Automotive Extrusions |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 199.2 | 173.5 | 129.5
GE products |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 426.1 | 419.5 | 411.0
Other products |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 71.1 | $ 76.8 | $ 80.0

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