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Summary of Significant Accounting Policies Discussion (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 9 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Sep. 30, 2016
Apr. 12, 2016
Mar. 31, 2016
Dec. 31, 2013
Property, Plant and Equipment [Line Items]                
Other current assets $ 486.6 $ 486.6 $ 447.6          
First Lien Exit Facility   1.95            
Other Assets, Noncurrent 910.4 $ 910.4 363.7          
Total assets 11,777.7 11,777.7 10,946.9 $ 13,191.1        
Long-term Debt and Capital Lease Obligations, Current 20.2 20.2 5,874.9          
Long-term Debt and Capital Lease Obligations 0.0 0.0 366.3          
Liabilities $ 11,439.9 $ 11,439.9 $ 10,028.4          
Initial Offering Period   750            
Proceeds from Issuance of Private Placement   $ 750.0            
Equity Investment necessary to consummate Reorg Plan   1.5            
Take-back Paper   1.5            
Summary Of Significant Accounting Policies Discussion Textuals [Abstract]                
Stockholders' Equity, Reverse Stock Split   Pursuant to the authorization provided at a special meeting of the Company's stockholders held on September 16, 2015, the Company completed a 1-for-15 reverse stock split of the shares of the Company’s common stock on September 30, 2015 (the Reverse Stock Split). Refer to Note 1. "Summary of Significant Accounting Policies" for additional details surrounding the Reverse Stock Split. Pursuant to the authorization provided at a special meeting of the Company's stockholders held on September 16, 2015, the Company completed a 1-for-15 reverse stock split of the shares of the Company’s common stock on September 30, 2015 (the Reverse Stock Split). As a result of the Reverse Stock Split, every 15 shares of issued and outstanding common stock were combined into one issued and outstanding share of Common Stock, without any change in the par value per share.          
Common Stock, Shares Authorized 53.3 53.3            
Common Stock, Par or Stated Value Per Share $ 0.01 $ 0.01            
Cash and cash equivalents $ 872.3 $ 872.3 $ 261.3 298.0   $ 652.1   $ 444.0
Period considered to treat short-term, highly liquid investments as cash equivalents   three months or less            
Other-than-temporary impairment losses on marketable securities   $ 0.0 4.7 4.7        
Other-than-temporary impairment losses on equity and cost method investments   $ 276.5 0.0          
Recognition of tax benefits from uncertain tax positions   greater than fifty percent likelihood of being realized upon ultimate settlement            
Restructuring charges for voluntary and involuntary workforce reductions $ 2.8 $ 15.5 23.5 26.0        
Asset impairment charges related to long-lived assets   247.9 1,001.3 149.7        
Foreign currency remeasurement (loss) gains   7.4 (6.4) (1.3)        
Foreign currency translation adjustment   $ 1.8 $ 34.9 $ 41.0        
Buildings and improvements [Member]                
Property, Plant and Equipment [Line Items]                
Estimated useful life   3 to 34            
Machinery and equipment [Member]                
Property, Plant and Equipment [Line Items]                
Estimated useful life   3 to 34            
Leasehold improvements [Member]                
Property, Plant and Equipment [Line Items]                
Estimated useful life   Shorter of Useful Life or Remaining Life of Lease            
Interest In Middlemount Coal Pty Limited [Member]                
Summary Of Significant Accounting Policies Discussion Textuals [Abstract]                
Ownership percentage of equity method investment 50.00% 50.00%            
Minimum [Member] | Buildings and improvements [Member]                
Property, Plant and Equipment [Line Items]                
Estimated useful life   1            
Minimum [Member] | Machinery and equipment [Member]                
Property, Plant and Equipment [Line Items]                
Estimated useful life   1            
Maximum [Member] | Buildings and improvements [Member]                
Property, Plant and Equipment [Line Items]                
Estimated useful life   37            
Maximum [Member] | Machinery and equipment [Member]                
Property, Plant and Equipment [Line Items]                
Estimated useful life   37            
Common Stock [Member]                
Property, Plant and Equipment [Line Items]                
Stock Issued During Period, Shares, Reverse Stock Splits   278.0            
Common Stock, Shares, issues post reverse stock split 19.0 19.0            
Stock Authorized During Period, Shares, Reverse Stock Splits     800.0          
Summary Of Significant Accounting Policies Discussion Textuals [Abstract]                
Common Stock, Shares Authorized 53.3 53.3 53.3          
Common Stock, Par or Stated Value Per Share $ 0.01 $ 0.01 $ 0.01          
Debt burden reduced at exit of bankruptcy [Member]                
Property, Plant and Equipment [Line Items]                
Long-term Debt $ 6,600.0 $ 6,600.0            
Revolving Credit Facility [Member]                
Property, Plant and Equipment [Line Items]                
Long-term Debt 1,558.1 1,558.1 $ 0.0       $ 947.0  
Summary Of Significant Accounting Policies Discussion Textuals [Abstract]                
Exit facility, maximum borrowing capacity 1,650.0 1,650.0            
6.50% Senior Notes due September 2020 [Member]                
Property, Plant and Equipment [Line Items]                
Long-term Debt $ 645.8 $ 645.8 645.5          
Summary Of Significant Accounting Policies Discussion Textuals [Abstract]                
Stated interest rate - percentage 6.50% 6.50%     6.50%      
10.00% Senior Secured Second Lien Notes Due 2022 [Member]                
Property, Plant and Equipment [Line Items]                
Long-term Debt $ 962.3 $ 962.3 960.4          
Face amount of senior notes $ 1,000.0 $ 1,000.0            
Summary Of Significant Accounting Policies Discussion Textuals [Abstract]                
Stated interest rate - percentage 10.00% 10.00%            
6.00% Senior Notes due November 2018 [Member]                
Property, Plant and Equipment [Line Items]                
Long-term Debt $ 1,509.9 $ 1,509.9 1,508.9          
Summary Of Significant Accounting Policies Discussion Textuals [Abstract]                
Stated interest rate - percentage 6.00% 6.00%            
6.25% Senior Notes due November 2021 [Member]                
Property, Plant and Equipment [Line Items]                
Long-term Debt $ 1,327.7 $ 1,327.7 1,327.0          
Summary Of Significant Accounting Policies Discussion Textuals [Abstract]                
Stated interest rate - percentage 6.25% 6.25%     6.25%      
7.875% Senior Notes [Member]                
Summary Of Significant Accounting Policies Discussion Textuals [Abstract]                
Stated interest rate - percentage 7.875% 7.875%            
Term Loan Facility [Member]                
Summary Of Significant Accounting Policies Discussion Textuals [Abstract]                
Stated interest rate - percentage 4.50% 4.50%            
Exit facility, maximum borrowing capacity $ 950.0 $ 950.0            
6.000% Senior Secured Notes Due 2022 [Member]                
Property, Plant and Equipment [Line Items]                
Face amount of senior notes $ 500.0 $ 500.0            
Summary Of Significant Accounting Policies Discussion Textuals [Abstract]                
Stated interest rate - percentage 6.00% 6.00%            
6.375% Senior Secured Notes Due 2022 [Member]                
Property, Plant and Equipment [Line Items]                
Face amount of senior notes $ 500.0 $ 500.0            
Summary Of Significant Accounting Policies Discussion Textuals [Abstract]                
Stated interest rate - percentage 6.375% 6.375%            
Paid to second lien noteholders in partial satisfaction of their claims [Member]                
Property, Plant and Equipment [Line Items]                
Cash $ 450.0 $ 450.0            
Second Lien Notes   450            
First Lien Debtholders [Member]                
Property, Plant and Equipment [Line Items]                
First Lien Debt   450            
Class 5B Claims [Member]                
Property, Plant and Equipment [Line Items]                
Pro Rate Share in Cash 75.0 $ 75.0            
Class 5A Claims [Member]                
Property, Plant and Equipment [Line Items]                
Cash 5.0 $ 5.0            
Eurocurrency Rate [Member] | Term Loan Facility [Member]                
Property, Plant and Equipment [Line Items]                
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum   1.00%            
Non-Debtor Subsidiaries [Member]                
Property, Plant and Equipment [Line Items]                
Other current assets 416.2 $ 416.2            
Lease Commitments   189            
Other Assets, Noncurrent 596.7 $ 596.7            
Total assets 6,012.9 6,012.9            
Long-term Debt and Capital Lease Obligations, Current 0.9 0.9            
Liabilities 2,042.7 2,042.7            
Summary Of Significant Accounting Policies Discussion Textuals [Abstract]                
Cash and cash equivalents 477.8 477.8       $ 543.6    
Restructuring charges for voluntary and involuntary workforce reductions 0.6              
Other Current Assets [Member]                
Property, Plant and Equipment [Line Items]                
Deferred Finance Costs, Current (55.5) (55.5)            
Other Noncurrent Assets [Member]                
Property, Plant and Equipment [Line Items]                
Deferred Finance Costs, Current (18.9) (18.9)            
Assets [Member]                
Property, Plant and Equipment [Line Items]                
Deferred Finance Costs, Current (74.4) (74.4)            
Long-term Debt and Capital Lease Obligations, Current [Member]                
Property, Plant and Equipment [Line Items]                
Deferred Finance Costs, Current (55.5) (55.5)            
Long-term Debt and Capital Lease Obligations [Member]                
Property, Plant and Equipment [Line Items]                
Deferred Finance Costs, Current (18.9) (18.9)            
Liability [Member]                
Property, Plant and Equipment [Line Items]                
Deferred Finance Costs, Current $ (74.4) $ (74.4)            
Peabody Energy [Member]                
Property, Plant and Equipment [Line Items]                
Other current assets     503.1          
Other Assets, Noncurrent     382.6          
Total assets     11,021.3          
Long-term Debt and Capital Lease Obligations, Current     5,930.4          
Long-term Debt and Capital Lease Obligations     385.2          
Liabilities     $ 10,102.8