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Leases - Supplemental Balance Sheet Information (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Operating leases:      
Operating lease right-of-use assets $ 119.3 $ 61.9 $ 26.9
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Accounts Payable and Accrued Liabilities, Current Accounts Payable and Accrued Liabilities, Current  
Accounts payable and accrued expenses $ 32.4 $ 17.3  
Operating lease liabilities, less current portion 86.7 47.7  
Total lease liabilities $ 119.1 $ 65.0  
Finance leases:      
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Property, plant, equipment and mine development, net Property, plant, equipment and mine development, net  
Property, plant, equipment and mine development $ 46.8 $ 34.3  
Accumulated depreciation (22.8) (15.4)  
Property, plant, equipment and mine development, net $ 24.0 $ 18.9  
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Less: Current portion of long-term debt Less: Current portion of long-term debt  
Current portion of long-term debt $ 15.8 $ 13.5  
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Long-Term Debt and Lease Obligation Long-Term Debt and Lease Obligation  
Long-term debt, less current portion $ 9.3 $ 8.8  
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] Long-Term Debt and Lease Obligation [Member] Long-Term Debt and Lease Obligation [Member]  
Total finance lease liabilities $ 25.1 $ 22.3  
Weighted average remaining lease term (years)      
Operating leases 4 years 4 years 7 months 6 days  
Finance leases 5 years 2 months 12 days 2 years 3 months 18 days  
Weighted average discount rate      
Operating leases 7.10% 6.80%  
Finance leases 6.20% 6.80%  
Operating Leased Assets [Line Items]      
Long-term debt, less current portion $ 9.3 $ 8.8  
Current portion of long-term debt 15.8 13.5  
Operating lease liabilities $ 32.4 $ 17.3