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Financial Instruments and Other Guarantees (Details)
$ in Millions, $ in Millions
Sep. 30, 2025
USD ($)
Sep. 30, 2025
AUD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2024
AUD ($)
Guarantee Obligations [Line Items]        
Restricted Cash $ 717.8   $ 682.2  
Restricted cash and collateral 851.0   809.8  
Surety Trust Account        
Guarantee Obligations [Line Items]        
Restricted Cash 392.8   394.6  
Deposits with Regulatory Authorities        
Guarantee Obligations [Line Items]        
Deposits Assets 133.2 $ 201.0 127.6 $ 205.0
Cash backed bank guarantees        
Guarantee Obligations [Line Items]        
Restricted Cash   $ 312.0   $ 271.0
Collateralized letters of credit funding        
Guarantee Obligations [Line Items]        
Restricted Cash 325.0   $ 287.6  
Asset Retirement Obligations        
Guarantee Obligations [Line Items]        
Surety bonds amount 924.8      
Letters of credit outstanding, amount 55.2      
Surety Bonds and Letters of Credit Outstanding for Reclamation Support 980.0      
Less: Letters of Credit in Support of Surety Bonds 55.2      
Total Obligations Supported, Net 924.8      
Asset Retirement and Other Obligations        
Guarantee Obligations [Line Items]        
Surety bonds amount 1,013.1      
Letters of credit outstanding, amount 111.8      
Total Surety Bonds and Letters of Credit Outstanding 1,124.9      
Total Letters of Credit in Support of Surety Bonds (55.3)      
Total Obligations Supported, Net 1,069.6      
Other Obligations        
Guarantee Obligations [Line Items]        
Surety bonds amount 88.3      
Letters of credit outstanding, amount 56.6      
Surety Bonds and Letters of Credit Outstanding for Other Support 144.9      
Less: Letters of Credit in Support of Surety Bonds 0.1      
Total Obligations Supported, Net 144.8      
Secured debt | Accounts Receivable Securitization Program        
Guarantee Obligations [Line Items]        
Letters of credit outstanding, amount 62.5      
Letter of Credit        
Guarantee Obligations [Line Items]        
Letters of credit outstanding, amount 49.3      
Collateralized Letter of Credit Agreement        
Guarantee Obligations [Line Items]        
Letters of credit outstanding, amount $ 115.6