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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, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Revenue from External Customer |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 331.9 | $ 320.6 | $ 334.9 | $ 343.2 | $ 316.6 | $ 336.4 | $ 367.2 | $ 371.7 | $ 1,330.6 | $ 1,391.9 | $ 1,356.1
Aero/HS products |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 675.4 | 695.5 | 686.3
Automotive Extrusions |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 188.8 | 199.2 | 173.5
GE products |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 420.1 | 426.1 | 419.5
Other products |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 46.3 | $ 71.1 | $ 76.8

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