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Long-term Debt - Narrative (Details)
 3 Months Ended 6 Months Ended
Feb. 19, 2025
$ / shares
Nov. 25, 2024
USD ($)
days
Jan. 18, 2024
USD ($)
Mar. 01, 2022
USD ($)
$ / shares
Jun. 30, 2025
USD ($)
$ / shares
Jun. 30, 2024
USD ($)
$ / shares
Jun. 30, 2025
USD ($)
$ / shares
Jun. 30, 2024
USD ($)
$ / shares
Dec. 31, 2024
USD ($)
Jun. 30, 2023
USD ($)
Debt Instrument [Line Items]                    
Interest expense, net of capitalized interest         $ 11,100,000 $ 10,700,000 $ 22,600,000 $ 25,400,000    
Finance lease obligations         19,300,000   19,300,000   $ 25,100,000  
Interest Paid, Capitalized, Investing Activity         14,200,000 $ 12,600,000 24,100,000 $ 24,100,000    
2024 Credit Agreement Availability         $ 270,700,000   $ 270,700,000      
Dividends declared per share | $ / shares         $ 0.075 $ 0.075 $ 0.150 $ 0.150    
Interest Costs Capitalized         $ 1,700,000 $ 1,700,000 $ 3,900,000 $ 1,700,000    
Anglo American Acquisition                    
Debt Instrument [Line Items]                    
Upfront cash payment for planned acquisition   $ 2,058,000,000.000                
Payments to Acquire Businesses, Gross   75,000,000                
Letter of Credit                    
Debt Instrument [Line Items]                    
Stated interest rate         0.75%   0.75%      
Line of credit facility, maximum borrowing capacity         $ 250,000,000   $ 250,000,000      
Debt instrument, fronting fee     0.125%              
Letters of credit outstanding, amount         49,300,000   $ 49,300,000      
Line of Credit Facility, Commitment Fee Percentage     0.50%              
Revolving credit facility                    
Debt Instrument [Line Items]                    
Debt issuance cost   $ 900,000 $ 9,700,000              
Line of credit facility, maximum borrowing capacity     $ 320,000,000              
Maximum                    
Debt Instrument [Line Items]                    
Basis spread on variable rate     3.25%              
Maximum | Letter of Credit                    
Debt Instrument [Line Items]                    
Basis spread on variable rate     4.25%              
Maximum | Revolving credit facility                    
Debt Instrument [Line Items]                    
Basis spread on variable rate     4.25%              
Minimum                    
Debt Instrument [Line Items]                    
Basis spread on variable rate     2.50%              
Minimum | Letter of Credit                    
Debt Instrument [Line Items]                    
Basis spread on variable rate     3.50%              
Minimum | Revolving credit facility                    
Debt Instrument [Line Items]                    
Basis spread on variable rate     3.50%              
BUMA Loan Note                    
Debt Instrument [Line Items]                    
Stated interest rate   10.00%                
Proceeds from Notes Payable   $ 9,300,000                
Interest Costs Capitalized         500,000          
Bridge Facility                    
Debt Instrument [Line Items]                    
Basis spread on variable rate   8.00%                
Line of credit facility, maximum borrowing capacity   $ 2,075,000,000.000                
Debt Instrument, base rate plus applicable margin   7.00%                
Debt Instrument, Number of Days Following Closing Date | days   90                
Debt Instrument, Term   364 days                
Duration fee         $ 10,400,000          
Bridge Facility | Maximum                    
Debt Instrument [Line Items]                    
Basis spread on variable rate   0.75%                
Senior Notes | 3.250% Convertible Senior Notes due March 2028 (2028 Convertible Notes)                    
Debt Instrument [Line Items]                    
Stated interest rate         3.25%   3.25%      
Long-term debt         $ 320,000,000.0   $ 320,000,000.0   $ 320,000,000.0  
Principal amount       $ 320,000,000            
Debt Issuance Costs, Gross                   $ 11,200,000
Debt Conversion, Converted Instrument, Rate         1.00%          
Debt Instrument, Convertible, Conversion Ratio       50.3816 52.0421          
Debt Instrument, Convertible, Revised Conversion Ratio 51.7762                  
Debt Instrument, Convertible, Conversion Price | $ / shares $ 19.31     $ 19.85            
Debt Instrument, Principle Amount         $ 1,000   $ 1,000