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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, 2024 | Mar. 31, 2023
Net sales: |  |
Net sales | $ 737.5 | $ 807.6
Aero/HS Products |  |
Net sales: |  |
Net sales | 220.5 | 214.0
Packaging |  |
Net sales: |  |
Net sales | 298.1 | 354.2
GE Products |  |
Net sales: |  |
Net sales | 153.0 | 162.1
Automotive Extrusions |  |
Net sales: |  |
Net sales | 63.5 | 70.8
Other products |  |
Net sales: |  |
Net sales | 2.4 | 6.5
Products Transferred at a Point in Time |  |
Net sales: |  |
Net sales | 569.4 | 624.8
Products Transferred Over Time |  |
Net sales: |  |
Net sales | $ 168.1 | $ 182.8

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