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Cover Page
Sep. 28, 2021
Sep. 27, 2021
Cover [Abstract]    
Document Type 8-K  
Document Period End Date Sep. 28, 2021  
Entity Registrant Name PEABODY ENERGY CORPORATION  
Entity Incorporation, State or Country Code DE  
Entity File Number 1-16463  
Entity Tax Identification Number 13-4004153  
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 63101-1826  
City Area Code (314)  
Local Phone Number 342-3400  
Written Communications false  
Soliciting Material false  
Pre-commencement Tender Offer false  
Pre-commencement Issuer Tender Offer false  
Title of 12(b) Security Common Stock, par value $0.01 per share  
Trading Symbol BTU  
Security Exchange Name NYSE  
Entity Emerging Growth Company false  
Entity Central Index Key   0001064728
Amendment Flag   false