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Financial Instruments and Other Guarantees (Details)
$ in Millions, $ in Millions
Sep. 30, 2024
USD ($)
Sep. 30, 2024
AUD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2023
AUD ($)
Mar. 31, 2023
USD ($)
Guarantee Obligations [Line Items]          
Restricted Cash $ 705.6   $ 680.9    
Deposits Assets 133.4   276.7    
Restricted cash and collateral 839.0   957.6    
Surety Trust Account          
Guarantee Obligations [Line Items]          
Restricted Cash 397.6   444.0   $ 566.3
Deposits with Regulatory Authorities          
Guarantee Obligations [Line Items]          
Deposits Assets 133.4 $ 192.0 276.7 $ 404.0  
Cash backed bank guarantees          
Guarantee Obligations [Line Items]          
Restricted Cash 308.0 $ 271.0 $ 236.9 $ 95.0  
Asset Retirement Obligations          
Guarantee Obligations [Line Items]          
Surety bonds amount 932.2        
Letters of credit outstanding, amount 55.2        
Surety Bonds and Letters of Credit Outstanding for Reclamation Support 987.4        
Less: Letters of Credit in Support of Surety Bonds 55.2        
Total Obligations Supported, Net 932.2        
Asset Retirement and Other Obligations          
Guarantee Obligations [Line Items]          
Surety bonds amount 1,039.9        
Letters of credit outstanding, amount 159.0        
Total Obligations Supported, Net 1,131.3        
Total Surety Bonds and Letters of Credit Outstanding 1,198.9        
Total Letters of Credit in Support of Surety Bonds (67.6)        
Other Obligations          
Guarantee Obligations [Line Items]          
Surety bonds amount 107.7        
Letters of credit outstanding, amount 103.8        
Less: Letters of Credit in Support of Surety Bonds 12.4        
Total Obligations Supported, Net 199.1        
Surety Bonds and Letters of Credit Outstanding for Other Support 211.5        
Secured debt | Accounts Receivable Securitization Program          
Guarantee Obligations [Line Items]          
Letters of credit outstanding, amount 60.4        
Letter of Credit          
Guarantee Obligations [Line Items]          
Letters of credit outstanding, amount 98.6        
Collateralized Letter of Credit Agreement          
Guarantee Obligations [Line Items]          
Letters of credit outstanding, amount $ 116.6