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Leases - Supplemental Balance Sheet Information (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Operating leases:      
Operating lease right-of-use assets $ 121.2 $ 119.3 $ 61.9
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 $ 36.0 $ 32.4  
Operating lease liabilities, less current portion 87.5 86.7  
Total lease liabilities $ 123.5 $ 119.1  
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 $ 40.7 $ 46.8  
Accumulated depreciation (25.1) (22.8)  
Property, plant, equipment and mine development, net $ 15.6 $ 24.0  
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 $ 15.2 $ 15.8  
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Long-term debt Long-term debt  
Long-term debt, less current portion $ 5.6 $ 9.3  
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 $ 20.8 $ 25.1  
Weighted average remaining lease term (years)      
Operating leases 4 years 4 years  
Finance leases 1 year 9 months 18 days 5 years 2 months 12 days  
Weighted average discount rate      
Operating leases 7.50% 7.10%  
Finance leases 6.20% 6.20%  
Operating Leased Assets [Line Items]      
Long-term debt, less current portion $ 5.6 $ 9.3  
Current portion of long-term debt 15.2 15.8  
Operating lease liabilities $ 36.0 $ 32.4