v3.26.1
Cover Page - shares
shares in Millions
 6 Months Ended
Jun. 30, 2026
Aug. 03, 2026
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2026  
Document Transition Report false  
Entity File Number 1-16463  
Entity Registrant Name PEABODY ENERGY CORP  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 13-4004153  
Entity Address, Address Line One 1245 J.J. Kelley Memorial Drive,  
Entity Address, City or Town St. Louis,  
Entity Address, State or Province MO  
Entity Address, Postal Zip Code 63131  
City Area Code 314  
Local Phone Number 342-3400  
Title of 12(b) Security Common Stock, par value $0.01 per share  
Trading Symbol BTU  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   121.9
Entity Central Index Key 0001064728  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Amendment Flag false  
Number of reportable segments not disclosed flag true  
Entity Addresses [Line Items]    
Entity Address, Address Line One 1245 J.J. Kelley Memorial Drive,  
Entity Address, City or Town St. Louis,  
Entity Address, State or Province MO  
Entity Address, Postal Zip Code 63131  
Former Address    
Cover [Abstract]    
Entity Address, Address Line One 701 Market Street,  
Entity Address, City or Town St. Louis,  
Entity Address, State or Province MO  
Entity Address, Postal Zip Code 63101  
Entity Addresses [Line Items]    
Entity Address, Address Line One 701 Market Street,  
Entity Address, City or Town St. Louis,  
Entity Address, State or Province MO  
Entity Address, Postal Zip Code 63101