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Financial Instruments, Guarantees With Off-Balance-Sheet Risk and Other Guarantees (Details) - USD ($)
$ in Millions
 3 Months Ended 11 Months Ended 12 Months Ended
Feb. 03, 2023
Mar. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Apr. 14, 2023
Feb. 13, 2023
Mar. 01, 2022
Guarantee Obligations [Line Items]                  
Asset retirement obligations       $ 702.8 $ 750.0 $ 719.8      
Interest expense       59.8 140.3 183.4      
Restricted cash included in “Restricted cash and collateral”       680.9 110.3        
Cumulative Collateral Posted       557.8          
Difference between penal sum of all surety bonds and amount of collateral posted in favor of surety providers       555.2          
Company maintain minimum liquidity             $ 237.2    
Net loss (gain) on early debt extinguishment       8.8 57.9 (33.2)      
Deposits Assets       276.7 77.1        
restricted cash and collateral       957.6 187.4        
Surety Trust Account                  
Guarantee Obligations [Line Items]                  
Restricted cash included in “Restricted cash and collateral”   $ 566.3   444.0 0.0        
Collateralized letters of credit funding                  
Guarantee Obligations [Line Items]                  
Restricted cash included in “Restricted cash and collateral”       172.0 110.3        
Deposits with Regulatory Authorities                  
Guarantee Obligations [Line Items]                  
Deposits Assets       276.7 33.6        
LC Facility                  
Guarantee Obligations [Line Items]                  
Deposits Assets       0.0 28.5        
Deposits Held on Behalf of Surety                  
Guarantee Obligations [Line Items]                  
Deposits Assets       0.0 15.0        
Cash backed bank guarantees                  
Guarantee Obligations [Line Items]                  
Restricted cash included in “Restricted cash and collateral”       64.9 0.0        
Asset Retirement Obligations                  
Guarantee Obligations [Line Items]                  
Letters of credit outstanding, amount       6.0          
Financial Instrument, Surety Bonds Amount       1,022.6          
Surety Bonds and Letters of Credit Outstanding for Reclamation Support       1,028.6          
Letters of Credit in Support of Surety Bonds       (6.0)          
Total Obligations Supported, Net       1,022.6          
Other Obligations                  
Guarantee Obligations [Line Items]                  
Letters of credit outstanding, amount       102.1          
Financial Instrument, Surety Bonds Amount       117.3          
Surety Bonds and Letters of Credit Outstanding for Other Support       219.4          
Letters of Credit in Support of Surety Bonds       (12.2)          
Total Obligations Supported, Net       207.2          
Asset Retirement and Other Obligations                  
Guarantee Obligations [Line Items]                  
Letters of credit outstanding, amount       108.1          
Financial Instrument, Surety Bonds Amount       1,139.9          
Total Surety Bonds and Letters of Credit Outstanding       1,248.0          
Total Letters of Credit in Support of Surety Bonds       (18.2)          
Total Obligations Supported, Net       1,229.8          
Maximum                  
Guarantee Obligations [Line Items]                  
Debt Instrument, Collateral Amount             721.8    
Maximum | Subsequent Event                  
Guarantee Obligations [Line Items]                  
Basis spread on variable rate     3.25%            
Minimum | Subsequent Event                  
Guarantee Obligations [Line Items]                  
Basis spread on variable rate     2.50%            
Surety Bond                  
Guarantee Obligations [Line Items]                  
Debt instrument, transaction support agreements, fair value of second liens on mining equipment       200.0          
Debt Instrument, Transaction Support Agreements, Additional Collateral Posted   140.5              
Surety Agreement Liquidity Covenant, Amount       $ 400.0          
Debt Instrument, Transaction Support Agreement, Additional Collateral Held   $ 15.0              
Surety Bond | Maximum                  
Guarantee Obligations [Line Items]                  
Debt Instrument Covenant, Net Leverage Ratio       1.5          
Surety Bond | Minimum                  
Guarantee Obligations [Line Items]                  
Debt Instrument Covenant, Net Leverage Ratio       1.0          
3.250% Convertible Senior Notes due March 2028 | Senior Notes                  
Guarantee Obligations [Line Items]                  
Debt principal amount                 $ 320.0
Stated interest rate       3.25%         3.25%
Debt Instrument, Funded, Percent       50.00%          
Accounts Receivable Securitization Program                  
Guarantee Obligations [Line Items]                  
Exit facility, maximum borrowing capacity               $ 225.0  
Line of Credit Facility, Previous Maximum Borrowing Capacity               $ 175.0  
Accounts Receivable Securitization Program | Secured Debt                  
Guarantee Obligations [Line Items]                  
Long-term debt       $ 0.0          
Interest expense       3.6 3.8 $ 2.9      
Accounts Receivable from Securitization       90.4          
LC Facility                  
Guarantee Obligations [Line Items]                  
Debt instrument repurchase amount         $ 30.0   $ 30.0    
Mandatory Repurchase, Percentage of Accreted Value         95.00%        
Secured Debt | Accounts Receivable Securitization Program                  
Guarantee Obligations [Line Items]                  
Letters of credit outstanding, amount       $ 108.1          
Secured Debt | Accounts Receivable Securitization Program | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]                  
Guarantee Obligations [Line Items]                  
Basis spread on variable rate       2.10%          
Letter of Credit                  
Guarantee Obligations [Line Items]                  
Exit facility, maximum borrowing capacity       $ 250.0          
Cash Collateral, Percentage of the aggregate amount of letters of credit outstanding       103.00%          
Stated interest rate       0.75%          
Debt amount incurred $ 324.0                
Line of Credit Facility, Increase (Decrease), Net $ 65.0                
Revolving credit facility, fee on unused borrowings 6.00%                
Commitment fee percentage 0.50%                
Letter of Credit | Maximum                  
Guarantee Obligations [Line Items]                  
Transaction support agreements, additional collateral demands       $ 5.0          
Collateralized Letter of Credit Agreement                  
Guarantee Obligations [Line Items]                  
Letters of credit outstanding, amount       167.0          
Cash-collateralized Letters of Credit       $ 172.0