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Financial Instruments and Other Guarantees (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Mar. 31, 2023
Guarantee Obligations [Line Items]      
Restricted Cash $ 698.0 $ 680.9  
Deposits Assets 127.1 276.7  
Restricted cash and collateral 825.1 957.6  
Surety Trust Account      
Guarantee Obligations [Line Items]      
Restricted Cash 398.4 444.0 $ 566.3
Deposits with Regulatory Authorities      
Guarantee Obligations [Line Items]      
Deposits Assets 127.1 276.7  
Cash backed bank guarantees      
Guarantee Obligations [Line Items]      
Restricted Cash 299.6 $ 236.9  
Asset Retirement Obligations      
Guarantee Obligations [Line Items]      
Surety bonds amount 934.0    
Letters of credit outstanding, amount 52.5    
Surety Bonds and Letters of Credit Outstanding for Reclamation Support 986.5    
Less: Letters of Credit in Support of Surety Bonds 52.5    
Total Obligations Supported, Net 934.0    
Asset Retirement and Other Obligations      
Guarantee Obligations [Line Items]      
Surety bonds amount 1,042.1    
Letters of credit outstanding, amount 154.2    
Total Obligations Supported, Net 1,129.3    
Total Surety Bonds and Letters of Credit Outstanding 1,196.3    
Total Letters of Credit in Support of Surety Bonds (67.0)    
Other Obligations      
Guarantee Obligations [Line Items]      
Surety bonds amount 108.1    
Letters of credit outstanding, amount 101.7    
Less: Letters of Credit in Support of Surety Bonds 14.5    
Total Obligations Supported, Net 195.3    
Surety Bonds and Letters of Credit Outstanding for Other Support 209.8    
Secured debt | Accounts Receivable Securitization Program      
Guarantee Obligations [Line Items]      
Letters of credit outstanding, amount 56.2    
Letter of Credit      
Guarantee Obligations [Line Items]      
Letters of credit outstanding, amount 98.0    
Collateralized Letter of Credit Agreement      
Guarantee Obligations [Line Items]      
Letters of credit outstanding, amount $ 116.6