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Business, Product and Geographical Area Information and Concentration of Risk, Net Sales by End Market Segment Applications (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Net Sales: |  |
Revenues | $ 395.2 | $ 388.0
Transferred at Point in Time |  |
Net Sales: |  |
Revenues | 131.8 | 156.6
Transferred over Time |  |
Net Sales: |  |
Revenues | 263.4 | 231.4
Aero/HS products |  |
Net Sales: |  |
Revenues | 198.5 | 170.2
Automotive Extrusions |  |
Net Sales: |  |
Revenues | 53.0 | 60.5
GE products |  |
Net Sales: |  |
Revenues | 130.0 | 143.3
Other products |  |
Net Sales: |  |
Revenues | $ 13.7 | $ 14.0

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