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Financial Instruments and Other Guarantees (Details)
$ in Millions, $ in Millions
Jun. 30, 2025
USD ($)
Jun. 30, 2025
AUD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2024
AUD ($)
Guarantee Obligations [Line Items]        
Restricted Cash $ 714.2   $ 682.2  
Restricted cash and collateral 847.1   809.8  
Surety Trust Account        
Guarantee Obligations [Line Items]        
Restricted Cash 392.7   394.6  
Deposits with Regulatory Authorities        
Guarantee Obligations [Line Items]        
Deposits Assets 132.9 $ 203.0 127.6 $ 205.0
Cash backed bank guarantees        
Guarantee Obligations [Line Items]        
Restricted Cash   $ 309.0   $ 271.0
Collateralized letters of credit funding        
Guarantee Obligations [Line Items]        
Restricted Cash 321.5   $ 287.6  
Asset Retirement Obligations        
Guarantee Obligations [Line Items]        
Surety bonds amount 925.8      
Letters of credit outstanding, amount 55.2      
Surety Bonds and Letters of Credit Outstanding for Reclamation Support 981.0      
Less: Letters of Credit in Support of Surety Bonds 55.2      
Total Obligations Supported, Net 925.8      
Asset Retirement and Other Obligations        
Guarantee Obligations [Line Items]        
Surety bonds amount 1,014.0      
Letters of credit outstanding, amount 107.9      
Total Surety Bonds and Letters of Credit Outstanding 1,121.9      
Total Letters of Credit in Support of Surety Bonds (55.3)      
Total Obligations Supported, Net 1,066.6      
Other Obligations        
Guarantee Obligations [Line Items]        
Surety bonds amount 88.2      
Letters of credit outstanding, amount 52.7      
Surety Bonds and Letters of Credit Outstanding for Other Support 140.9      
Less: Letters of Credit in Support of Surety Bonds 0.1      
Total Obligations Supported, Net 140.8      
Secured debt | Accounts Receivable Securitization Program        
Guarantee Obligations [Line Items]        
Letters of credit outstanding, amount 58.6      
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