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Pension and Savings Plans - Textual (Details)
 12 Months Ended
Jan. 01, 2025
Dec. 31, 2024
USD ($)
numberOfPlan
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Jan. 31, 2025
USD ($)
Mar. 31, 2022
USD ($)
Defined Benefit Plan Disclosure [Line Items]            
Defined Benefit Plan, Funding Status   $ 11,100,000        
Liability for Future Policy Benefits, Individual and Group Annuities and Supplementary Contracts           $ 500,000,000
Subsequent Event            
Defined Benefit Plan Disclosure [Line Items]            
Defined Benefit Plan Termination, Final Contribution Amount         $ 5,000,000  
Pension Benefit Guaranty Corporation | Subsequent Event            
Defined Benefit Plan Disclosure [Line Items]            
Release of a letter of credit         $ 37,000,000  
Pension Plan            
Defined Benefit Plan Disclosure [Line Items]            
Settlement gain   0 $ 2,200,000 $ 0    
Net actuarial gain   $ 1,900,000 $ 0 $ 20,600,000    
Expected long-term return on plan assets   4.40% 4.85% 3.20%    
Accumulated benefit obligation   $ 117,600,000 $ 125,200,000      
Defined benefit plan, assets   104,800,000 116,000,000.0 $ 583,300,000    
Peabody Plan            
Defined Benefit Plan Disclosure [Line Items]            
Defined benefit plan, assets   0        
Plan with accumulated benefit obligation in excess of plan assets, accumulated benefit obligation   $ 0        
Western Plan            
Defined Benefit Plan Disclosure [Line Items]            
Expected long-term return on plan assets   4.40%        
Defined benefit plan, assets   $ 104,800,000 116,000,000      
401(k) plans            
Defined Benefit Plan Disclosure [Line Items]            
Number of 401(k) plans | numberOfPlan   3        
Paid discretionary contributions to defined contribution pension plans, company match   $ 21,700,000 21,300,000 20,100,000    
Discretionary contributions to defined contribution pension plans, granted   7,800,000 7,300,000 9,200,000    
Payment of discretionary contributions   7,700,000 4,600,000 4,000,000.0    
Superannuation            
Defined Benefit Plan Disclosure [Line Items]            
Paid discretionary contributions to defined contribution pension plans, company match   25,700,000 21,900,000 18,800,000    
Discretionary contributions to defined contribution pension plans, granted   2,200,000 1,600,000 1,600,000    
Discretionary contributions to defined contribution pension plans, paid   $ 1,900,000 $ 1,300,000 $ 0    
Fixed Income Investments            
Defined Benefit Plan Disclosure [Line Items]            
Plan assets, target allocation, percentage   100.00% 100.00%      
Scenario, Forecast | Western Plan            
Defined Benefit Plan Disclosure [Line Items]            
Expected long-term return on plan assets 4.95%