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Business, Product and Geographical Area Information - Schedule of Net Sales by End Market Segment Applications (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Net sales:        
Net sales $ 843.5 $ 747.7 [1],[2] $ 2,444.0 $ 2,258.6 [1],[2]
Aero/HS Products        
Net sales:        
Net sales 182.2 213.1 624.8 659.7
Packaging        
Net sales:        
Net sales 393.9 319.5 1,049.0 930.0
GE Products        
Net sales:        
Net sales 192.2 150.7 559.2 466.3
Automotive Extrusions        
Net sales:        
Net sales 75.2 62.1 211.0 195.3
Other Products        
Net sales:        
Net sales 0.0 2.3 0.0 7.3
Products Transferred at a Point in Time        
Net sales:        
Net sales 670.7 580.2 1,888.1 1,741.4
Products Transferred Over Time        
Net sales:        
Net sales $ 172.8 $ 167.5 $ 555.9 $ 517.2
[1] Adjusted to reflect the retrospective change in inventory valuation methodology from LIFO to WAC. See Note 14 for further discussion.
[2] Adjusted to reflect the retrospective change in inventory valuation methodology from LIFO to WAC. See Note 14 for further discussion.