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Long-term Debt - Schedule of Debt (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Carrying amount          
Debt Instrument [Line Items]          
Less: Unamortized debt issuance costs $ (4.8)   $ (4.8)   $ (6.3)
Total debt 337.3   337.3   348.1
BUMA Loan Note 0.0   0.0   9.3
Finance lease obligations 22.1   22.1   25.1
Total debt 337.3   337.3   348.1
Less: Current portion of long-term debt 15.5   15.5   15.8
Long-term debt 321.8   321.8   332.3
Interest expense, net of capitalized interest 10.0 $ 9.7 32.6 $ 35.1  
Interest Paid, Capitalized, Investing Activity 10.9 8.5 35.0 32.6  
Noncash interest expense 0.9 0.8 4.2 4.0  
Interest Costs Capitalized (2.0) (2.7) (5.9) (4.4)  
Financial assurance instruments          
Debt Instrument [Line Items]          
Interest expense, net of capitalized interest 6.2 5.8 19.8 20.7  
Indebtedness          
Debt Instrument [Line Items]          
Interest expense, net of capitalized interest 2.6 2.6 7.8 7.8  
Capital Lease Obligations          
Debt Instrument [Line Items]          
Interest expense, net of capitalized interest 0.4 0.4 1.1 1.3  
Amortization of debt issuance costs          
Debt Instrument [Line Items]          
Interest expense, net of capitalized interest 1.4 0.6 4.2 4.0  
Other          
Debt Instrument [Line Items]          
Interest expense, net of capitalized interest 0.8 2.5 3.8 3.8  
Senior Notes | 3.250% Convertible Senior Notes due March 2028 (2028 Convertible Notes)          
Debt Instrument [Line Items]          
2028 Convertible Notes $ 320.0   $ 320.0   $ 320.0
Stated interest rate 3.25%   3.25%    
Secured debt | Accounts Receivable Securitization Program          
Debt Instrument [Line Items]          
Interest expense, net of capitalized interest $ 0.6 $ 0.5 $ 1.8 $ 1.9