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Derivatives, Hedging Programs and Other Financial Instruments - Summary of (Gain) Loss Associated with Derivative Contracts (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Derivative Instruments Gain Loss [Line Items]        
Total of income and expense line items presented in our Statements of Consolidated Income in which the effects of cash flow hedges are recorded $ 722.8 $ 669.8 [1] $ 1,396.2 $ 1,321.1 [1]
Loss (gain) recognized in our Statements of Consolidated Income - Unrealized mark-to-market (gain) loss [2],[3]       2.2
Not Designated as Hedging Instrument        
Derivative Instruments Gain Loss [Line Items]        
Loss (gain) recognized in our Statements of Consolidated Income [4]   2.2   2.2
Not Designated as Hedging Instrument | Electricity        
Derivative Instruments Gain Loss [Line Items]        
Loss (gain) recognized in our Statements of Consolidated Income - Unrealized mark-to-market (gain) loss [4]   2.0   2.0
Reclassification from AOCI due to forecasted transactions probable of not occurring [4]   0.2   0.2
Cash Flow Hedges        
Derivative Instruments Gain Loss [Line Items]        
Total of income and expense line items presented in our Statements of Consolidated Income in which the effects of cash flow hedges are recorded 722.8 669.8 [4] 1,396.2 1,321.1 [4]
Cash Flow Hedges | Designated as Hedging Instrument        
Derivative Instruments Gain Loss [Line Items]        
Loss (gain) recognized in our Statements of Consolidated Income $ (2.5) $ (2.0) [4] $ (8.0) $ 0.1 [4]
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Total of income and expense line items presented in our Statements of Consolidated Income in which the effects of cash flow hedges are recorded Total of income and expense line items presented in our Statements of Consolidated Income in which the effects of cash flow hedges are recorded Total of income and expense line items presented in our Statements of Consolidated Income in which the effects of cash flow hedges are recorded Total of income and expense line items presented in our Statements of Consolidated Income in which the effects of cash flow hedges are recorded
Cash Flow Hedges | Designated as Hedging Instrument | Aluminum        
Derivative Instruments Gain Loss [Line Items]        
Loss (gain) recognized in our Statements of Consolidated Income $ (2.2) $ (2.7) [4] $ (7.4) $ (0.7) [4]
Cash Flow Hedges | Designated as Hedging Instrument | Alloying Metals        
Derivative Instruments Gain Loss [Line Items]        
Loss (gain) recognized in our Statements of Consolidated Income (0.5) (0.5) [4] (0.9) (0.5) [4]
Cash Flow Hedges | Designated as Hedging Instrument | Foreign exchange contracts        
Derivative Instruments Gain Loss [Line Items]        
Loss (gain) recognized in our Statements of Consolidated Income (0.1)      
Cash Flow Hedges | Designated as Hedging Instrument | Natural Gas        
Derivative Instruments Gain Loss [Line Items]        
Loss (gain) recognized in our Statements of Consolidated Income $ 0.3 0.4 [4] $ 0.3 0.7 [4]
Cash Flow Hedges | Designated as Hedging Instrument | Electricity        
Derivative Instruments Gain Loss [Line Items]        
Loss (gain) recognized in our Statements of Consolidated Income [4]   $ 0.8   $ 0.6
[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.
[3] See Note 12 for supplemental cash flow information.
[4] Adjusted to reflect the retrospective change in inventory valuation methodology from LIFO to WAC. See Note 14 for further discussion.