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Financial Instruments and Risk Management - General (Details)
$ / shares in Units, € in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
approach
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
approach
$ / shares
Sep. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
May 31, 2025
EUR (€)
Dec. 31, 2024
USD ($)
Jun. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Financial Instruments and Risk Management                  
Other comprehensive earnings (loss), net of tax $ (43.0) $ (9.0) $ (91.0) $ (4.0)          
Total shareholders' equity 5,452.0 6,755.0 5,452.0 6,755.0 $ 5,277.0   $ 5,930.0 $ 6,983.0 $ 3,837.0
Accumulated Other Comprehensive Earnings (Loss)                  
Financial Instruments and Risk Management                  
Other comprehensive earnings (loss), net of tax (43.0) (9.0) (91.0) (4.0)          
Total shareholders' equity (912.0) $ (912.0) (912.0) $ (912.0) $ (955.0)   (1,003.0) $ (921.0) $ (916.0)
Accumulated Other Comprehensive Earnings (Loss) For Non Derivative Financial Instrument                  
Financial Instruments and Risk Management                  
Total shareholders' equity (478.0)   (478.0)       $ (618.0)    
Net Investment | Accumulated Other Comprehensive Earnings (Loss) For Non Derivative Financial Instrument                  
Financial Instruments and Risk Management                  
Other comprehensive earnings (loss), net of tax 3.0   32.0            
Total shareholders' equity $ 32.0   $ 32.0            
Net Investment | 4.25% senior notes                  
Financial Instruments and Risk Management                  
Face amount of debt | €           € 850      
Interest rate (as a percent)           4.25%      
Commodity contracts                  
Financial Instruments and Risk Management                  
Number of methods through which entity manages commodity price risk in connection with market price fluctuations of aluminum ingot | approach 2   2            
Notional amount of contracts $ 1,685.0   $ 1,685.0            
Longest duration of forecasted hedge transactions in years 2 years   2 years            
Currency                  
Financial Instruments and Risk Management                  
Notional amount of contracts $ 2,894.0   $ 2,894.0            
Net gain (loss) included in AOCI, after-tax $ 2.0   2.0            
Net gain (loss) included in AOCI, after-tax, expected to be recognized in net earnings within the next 12 months     $ 2.0            
Longest duration of forecasted hedge transactions in years 1 year   1 year            
Interest Rate                  
Financial Instruments and Risk Management                  
Notional amount of contracts $ 600.0   $ 600.0            
Net gain (loss) included in AOCI, after-tax $ 1.0   1.0            
Net gain (loss) included in AOCI, after-tax, expected to be recognized in net earnings within the next 12 months     $ 1.0            
Longest duration of forecasted hedge transactions in years 2 years   2 years            
Net Investment                  
Financial Instruments and Risk Management                  
Notional amount of contracts $ 1,050.0   $ 1,050.0            
Net gain (loss) included in AOCI, after-tax $ (83.0)   $ (83.0)            
Longest duration of forecasted hedge transactions in years 4 years   4 years            
Equity contracts                  
Financial Instruments and Risk Management                  
Combined notional value, shares 1.1   1.1            
Change in company's stock price (in dollars per share) | $ / shares     $ 1