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Long-term Debt - Narrative (Details)
 3 Months Ended
Feb. 19, 2025
$ / shares
Nov. 25, 2024
USD ($)
days
Jan. 18, 2024
USD ($)
Mar. 01, 2022
USD ($)
$ / shares
Mar. 31, 2025
USD ($)
$ / shares
Mar. 31, 2024
USD ($)
$ / shares
Dec. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Debt Instrument [Line Items]                
Interest expense, net of capitalized interest         $ 11,500,000 $ 14,700,000    
Finance lease obligations         23,500,000   $ 25,100,000  
Interest Paid, Capitalized, Investing Activity         9,900,000 $ 11,500,000    
2024 Credit Agreement Availability         $ 270,700,000      
Dividends declared per share | $ / shares         $ 0.075 $ 0.075    
Interest Costs Capitalized         $ 2,200,000 $ 0    
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%      
Line of credit facility, maximum borrowing capacity         $ 250,000,000      
Debt instrument, fronting fee     0.125%          
Letters of credit outstanding, amount         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         $ 200,000      
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            
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%      
Long-term debt         $ 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        
Debt Instrument, Convertible, Revised Conversion Ratio 51.7762              
Debt Instrument, Convertible, Conversion Price | $ / shares $ 19.31     $ 19.85        
Debt Instrument, Principle Amount         $ 1,000