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Business, Product and Geographical Area Information, Net Sales by End Market Segment Applications (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Net Sales: |  |
Net sales | $ 369.3 | $ 395.2
Transferred at Point in Time |  |
Net Sales: |  |
Net sales | 215.6 | 223.3
Transferred over Time |  |
Net Sales: |  |
Net sales | 153.7 | 171.9
Aero/HS products |  |
Net Sales: |  |
Net sales | 196.0 | 198.5
Automotive Extrusions |  |
Net Sales: |  |
Net sales | 47.4 | 53.0
GE products |  |
Net Sales: |  |
Net sales | 121.7 | 130.0
Other products |  |
Net Sales: |  |
Net sales | $ 4.2 | 13.7
Previously Reported [Member] | Transferred at Point in Time |  |
Net Sales: |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 131.8
Previously Reported [Member] | Transferred over Time |  |
Net Sales: |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | $ 263.4

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