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Pension and Savings Plans - Textual (Details)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
USD ($)
numberOfPlan
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Mar. 31, 2022
USD ($)
Defined Benefit Plan Disclosure [Line Items]          
Number of 401(k) plans | numberOfPlan   3      
Paid discretionary contributions to defined contribution pension plans, company match   $ 21,300,000 $ 20,100,000 $ 9,700,000  
Discretionary contributions to defined contribution pension plans, granted   7,300,000 9,200,000 0  
Payment of prior performance contributions   4,600,000 4,000,000 0  
Liability for Future Policy Benefits, Individual and Group Annuities and Supplementary Contracts         $ 500,000,000
Defined Benefit Plan, Funding Status   11,100,000      
Australia          
Defined Benefit Plan Disclosure [Line Items]          
Paid discretionary contributions to defined contribution pension plans, company match   21,900,000 18,800,000 17,400,000  
Discretionary contributions to defined contribution pension plans, granted   1,600,000 1,600,000 0  
Payment of prior performance contributions     0 0  
Discretionary contributions to defined contribution pension plans, paid   1,300,000      
Pension Plan          
Defined Benefit Plan Disclosure [Line Items]          
Settlement gain   2,200,000 0 0  
Net actuarial gain   $ 0 $ 20,600,000 $ 12,700,000  
Expected long-term return on plan assets   4.85% 3.20% 2.80%  
Accumulated benefit obligation   $ 125,200,000 $ 580,900,000    
Defined benefit plan, assets   $ 116,000,000.0 583,300,000 $ 772,400,000  
Percentage of company's qualified pension plans on a GAAP accounting basis   80.00%      
Peabody Plan          
Defined Benefit Plan Disclosure [Line Items]          
Defined benefit plan, assets   $ 0 464,700,000    
Plan with accumulated benefit obligation in excess of plan assets, accumulated benefit obligation   $ 0 454,800,000    
Western Plan          
Defined Benefit Plan Disclosure [Line Items]          
Expected long-term return on plan assets   4.65%      
Defined benefit plan, assets   $ 116,000,000 118,600,000    
Plan with accumulated benefit obligation in excess of plan assets, accumulated benefit obligation   $ 125,200,000 $ 126,100,000    
Fixed Income Investments          
Defined Benefit Plan Disclosure [Line Items]          
Plan assets, target allocation, percentage   100.00% 100.00%    
Real Estate          
Defined Benefit Plan Disclosure [Line Items]          
Plan assets, target allocation, percentage   1.00% 1.00%    
Scenario, Forecast | Western Plan          
Defined Benefit Plan Disclosure [Line Items]          
Expected long-term return on plan assets 4.40%