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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 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Net sales:        
Net sales $ 823.1 $ 773.4 [1],[2] $ 1,600.5 $ 1,510.9 [1],[2]
Aero/HS Products        
Net sales:        
Net sales 227.9 226.1 442.6 446.6
Packaging        
Net sales:        
Net sales 340.9 312.4 655.1 610.5
GE Products        
Net sales:        
Net sales 185.4 162.6 367.0 315.6
Automotive Extrusions        
Net sales:        
Net sales 68.9 69.7 135.8 133.2
Other Products        
Net sales:        
Net sales 0.0 2.6 0.0 5.0
Products Transferred at a Point in Time        
Net sales:        
Net sales 626.6 591.8 1,217.4 1,161.2
Products Transferred Over Time        
Net sales:        
Net sales $ 196.5 $ 181.6 $ 383.1 $ 349.7
[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.