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Long-term Debt - Schedule of Debt (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Carrying amount      
Debt Instrument [Line Items]      
Less: Unamortized debt issuance costs $ (5.8)   $ (6.3)
Total debt 347.2   348.1
BUMA Loan Note 9.5   9.3
Finance lease obligations 23.5   25.1
Total debt 347.2   348.1
Less: Current portion of long-term debt 16.0   15.8
Long-term debt 331.2   332.3
Interest expense, net of capitalized interest 11.5 $ 14.7  
Interest Paid, Capitalized, Investing Activity 9.9 11.5  
Noncash interest expense 1.6 1.3  
Interest Costs Capitalized (2.2) 0.0  
Financial assurance instruments      
Debt Instrument [Line Items]      
Interest expense, net of capitalized interest 7.2 8.8  
Indebtedness      
Debt Instrument [Line Items]      
Interest expense, net of capitalized interest 2.6 2.6  
Capital Lease Obligations      
Debt Instrument [Line Items]      
Interest expense, net of capitalized interest 0.4 0.4  
Amortization of debt issuance costs      
Debt Instrument [Line Items]      
Interest expense, net of capitalized interest 1.4 1.2  
Other      
Debt Instrument [Line Items]      
Interest expense, net of capitalized interest 1.5 0.9  
Senior Notes | 3.250% Convertible Senior Notes due March 2028 (2028 Convertible Notes)      
Debt Instrument [Line Items]      
Long-term debt $ 320.0   $ 320.0
Stated interest rate 3.25%    
Secured debt | Accounts Receivable Securitization Program      
Debt Instrument [Line Items]      
Interest expense, net of capitalized interest $ 0.6 $ 0.8