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Financial Instruments, Guarantees With Off Balance Sheet Risk and Other Guarantees (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2025
AUD ($)
Nov. 03, 2025
Dec. 31, 2024
AUD ($)
Feb. 13, 2023
USD ($)
Mar. 01, 2022
USD ($)
Guarantee Obligations [Line Items]                
Interest expense, net of capitalized interest $ 43.9 $ 46.9 $ 59.8          
Restricted cash included in “Restricted cash and collateral” 709.2 682.2            
Financial Instrument, Surety Bonds Amount 997.2              
Net loss on early debt extinguishment 0.0 0.0 8.8          
Restricted cash and collateral 844.1 809.8            
Cash-backed bank guarantee facilities 208.7              
Capitalized debt issuance costs related to Securitization Program 1.8              
Cash Collateral, Percentage of the aggregate amount of letters of credit outstanding if credit rating falls below threshold         103.00%      
Surety Trust Account                
Guarantee Obligations [Line Items]                
Restricted cash included in “Restricted cash and collateral” 383.6 394.6            
Collateralized letters of credit funding                
Guarantee Obligations [Line Items]                
Restricted cash included in “Restricted cash and collateral” 325.6 287.6            
Deposits with Regulatory Authorities                
Guarantee Obligations [Line Items]                
Deposits Assets 134.9 127.6   $ 201.0   $ 205.0    
Cash backed bank guarantees                
Guarantee Obligations [Line Items]                
Restricted cash included in “Restricted cash and collateral”       $ 312.0   $ 271.0    
Asset Retirement Obligations                
Guarantee Obligations [Line Items]                
Financial Instrument, Surety Bonds Amount 908.8              
Letters of credit outstanding, amount 53.6              
Surety Bonds and Letters of Credit Outstanding for Reclamation Support 962.4              
Letters of Credit in Support of Surety Bonds (53.6)              
Total Obligations Supported, Net 908.8              
Other Obligations                
Guarantee Obligations [Line Items]                
Financial Instrument, Surety Bonds Amount 88.4              
Letters of credit outstanding, amount 59.0              
Surety Bonds and Letters of Credit Outstanding for Other Support 147.4              
Letters of Credit in Support of Surety Bonds (1.6)              
Total Obligations Supported, Net 145.8              
Asset Retirement and Other Obligations                
Guarantee Obligations [Line Items]                
Financial Instrument, Surety Bonds Amount 997.2              
Letters of credit outstanding, amount 112.6              
Total Surety Bonds and Letters of Credit Outstanding 1,109.8              
Total Letters of Credit in Support of Surety Bonds (55.2)              
Total Obligations Supported, Net 1,054.6              
Surety Bond                
Guarantee Obligations [Line Items]                
Surety Agreement Liquidity Covenant, Amount 400.0              
Difference between penal sum of all surety bonds and amount of collateral posted in favor of surety providers 487.3              
Collateral amount held in trust accounts 383.6              
Collateral amount held as letters of credit $ 126.3              
Surety Bond | Maximum                
Guarantee Obligations [Line Items]                
Debt Instrument Covenant, Net Leverage Ratio 1.5     1.5        
Debt Instrument, Collateral 509.9 million              
Surety Bond | Minimum                
Guarantee Obligations [Line Items]                
Debt Instrument Covenant, Net Leverage Ratio 1.0     1.0        
3.250% Convertible Senior Notes due March 2028 | Senior Notes                
Guarantee Obligations [Line Items]                
Debt principal amount               $ 320.0
Stated interest rate 3.25%     3.25%        
Debt Instrument, Funded, Percent 50.00%     50.00%        
Accounts Receivable Securitization Program                
Guarantee Obligations [Line Items]                
Exit facility, maximum borrowing capacity             $ 225.0  
Interest expense, net of capitalized interest $ 2.4 2.6 3.6          
Accounts Receivable Securitization Program | Secured Debt                
Guarantee Obligations [Line Items]                
Basis spread on variable rate 2.10%              
Long-term debt $ 0.0              
Interest expense, net of capitalized interest 2.4 $ 2.6 3.6          
Accounts Receivable from Securitization 96.0              
Secured Debt | Accounts Receivable Securitization Program                
Guarantee Obligations [Line Items]                
Letters of credit outstanding, amount 63.4              
Letter of Credit                
Guarantee Obligations [Line Items]                
Exit facility, maximum borrowing capacity $ 250.0              
Cash Collateral, Percentage of the aggregate amount of letters of credit outstanding 103.00%     103.00%        
Stated interest rate 0.75%     0.75%        
Net loss on early debt extinguishment     $ 8.8          
Letter of Credit | Maximum                
Guarantee Obligations [Line Items]                
Transaction support agreements, additional collateral demands $ 5.0              
Collateralized Letter of Credit Agreement                
Guarantee Obligations [Line Items]                
Letters of credit outstanding, amount 114.6              
Cash-collateralized Letters of Credit $ 116.9              
Letter of credit amendment                
Guarantee Obligations [Line Items]                
Cash Collateral, Percentage of the aggregate amount of letters of credit outstanding         102.00%