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Debt and Credit Facility - Summary of Interest Expense Relating to Senior Notes and Revolving Credit Facility (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Debt Instrument [Line Items]        
Total interest expense $ 12.4 $ 10.7 [1],[2] $ 36.1 $ 33.3 [1],[2]
Senior Notes and Revolving Credit Facility        
Debt Instrument [Line Items]        
Interest expense on finance lease liabilities 0.2 0.2 0.6 0.6
Interest expense capitalized as construction in progress (0.9) (2.5) (3.7) (6.3)
Total interest expense 12.4 10.7 36.1 33.3
Revolving Credit Facility        
Debt Instrument [Line Items]        
Revolving Credit Facility interest expense, including commitment fees and finance cost amortization 0.7 0.6 2.0 1.8
Senior Notes        
Debt Instrument [Line Items]        
Senior Notes interest expense, including debt issuance cost amortization $ 12.4 $ 12.4 $ 37.2 $ 37.2
[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.