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Financial Instruments and Other Guarantees (Details) - USD ($)
$ in Millions
Apr. 14, 2023
Mar. 31, 2023
Dec. 31, 2022
Guarantee Obligations [Line Items]      
Restricted Cash   $ 814.2 $ 110.3
Deposits Assets   122.5 77.1
Restricted cash and collateral   936.7 187.4
LC Facility      
Guarantee Obligations [Line Items]      
Deposits Assets   29.1 28.5
Surety Trust Account      
Guarantee Obligations [Line Items]      
Restricted Cash   566.3 0.0
Collateralized letters of credit funding      
Guarantee Obligations [Line Items]      
Restricted Cash   247.9 110.3
Deposits with Regulatory Authorities      
Guarantee Obligations [Line Items]      
Deposits Assets   78.4 33.6
Deposits Held on Behalf of Surety      
Guarantee Obligations [Line Items]      
Deposits Assets   15.0 15.0
Asset Retirement Obligations      
Guarantee Obligations [Line Items]      
Letters of credit outstanding, amount   22.4 437.8
Surety Bonds and Letters of Credit Outstanding for Reclamation Support   1,258.8 1,687.9
Letters of Credit in Support of Surety Bonds   (22.4) (431.7)
Total Obligations Supported, Net   1,236.4 1,256.2
Surety bonds amount   1,236.4 1,250.1
Asset Retirement and Other Obligations      
Guarantee Obligations [Line Items]      
Letters of credit outstanding, amount   89.4 569.6
Total Surety Bonds and Letters of Credit Outstanding   1,477.9 1,946.4
Total Letters of Credit in Support of Surety Bonds   (27.8) (468.9)
Total Obligations Supported, Net   1,450.1 1,477.5
Surety bonds amount   1,388.5 1,376.8
Other Obligations      
Guarantee Obligations [Line Items]      
Letters of credit outstanding, amount   67.0 131.8
Surety Bonds and Letters of Credit Outstanding for Other Support   219.1 258.5
Letters of Credit in Support of Surety Bonds   (5.4) (37.2)
Total Obligations Supported, Net   213.7 221.3
Surety bonds amount   152.1 $ 126.7
LC Facility      
Guarantee Obligations [Line Items]      
Letters of credit outstanding, amount   $ 223.8  
Mandatory Repurchase, Percentage of Accreted Value   95.00%  
Debt instrument, repurchase amount   $ 30.0  
LC Facility | Subsequent Event      
Guarantee Obligations [Line Items]      
Debt instrument, repurchase amount $ 30.0    
Accounts Receivable Securitization Program      
Guarantee Obligations [Line Items]      
Letters of credit outstanding, amount   101.3  
Accounts Receivable Securitization Program | Subsequent Event      
Guarantee Obligations [Line Items]      
Letters of credit outstanding, amount $ 101.3    
Secured debt | Accounts Receivable Securitization Program      
Guarantee Obligations [Line Items]      
Letters of credit outstanding, amount   190.7  
Collateralized Letter of Credit Agreement      
Guarantee Obligations [Line Items]      
Letters of credit outstanding, amount   $ 245.3