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Long-term Debt - Schedule of Debt (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Carrying amount          
Debt Instrument [Line Items]          
Less: Unamortized debt issuance costs $ (5.3)   $ (5.3)   $ (6.3)
Total debt 343.8   343.8   348.1
BUMA Loan Note 9.8   9.8   9.3
Finance lease obligations 19.3   19.3   25.1
Total debt 343.8   343.8   348.1
Less: Current portion of long-term debt 14.6   14.6   15.8
Long-term debt 329.2   329.2   332.3
Interest expense, net of capitalized interest 11.1 $ 10.7 22.6 $ 25.4  
Interest Paid, Capitalized, Investing Activity 14.2 12.6 24.1 24.1  
Noncash interest expense 1.7 1.9 3.3 3.2  
Interest Costs Capitalized (1.7) (1.7) (3.9) (1.7)  
Financial assurance instruments          
Debt Instrument [Line Items]          
Interest expense, net of capitalized interest 6.4 6.1 13.6 14.9  
Indebtedness          
Debt Instrument [Line Items]          
Interest expense, net of capitalized interest 2.6 2.6 5.2 5.2  
Capital Lease Obligations          
Debt Instrument [Line Items]          
Interest expense, net of capitalized interest 0.3 0.5 0.7 0.9  
Amortization of debt issuance costs          
Debt Instrument [Line Items]          
Interest expense, net of capitalized interest 1.4 2.0 2.8 3.2  
Other          
Debt Instrument [Line Items]          
Interest expense, net of capitalized interest 1.5 0.6 3.0 1.5  
Senior Notes | 3.250% Convertible Senior Notes due March 2028 (2028 Convertible Notes)          
Debt Instrument [Line Items]          
Long-term debt $ 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 $ 0.6 $ 1.2 $ 1.4