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Financial Instruments, Guarantees with Off-Balance-Sheet Risk and Other Guarantees (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Jul. 26, 2016
USD ($)
Apr. 15, 2016
USD ($)
Guarantee Obligations [Line Items]          
Financial instruments with off-balance sheet risk $ 1,764,900,000        
Cash Collateral 89,200,000        
Letters of credit in support of reclamation obligations or activities 15,700,000        
Letters of credit outstanding, amount 167,200,000        
Amount in bank guarantees, letters of credit and surety bonds related to collateral for road maintenance, performance guarantees and other operations 65,700,000        
Amount in letters of credit issued as collateral to support Patriot surety bonds 72,600,000        
Financial Instruments, Guarantees with Off-Balance-Sheet Risk and Other Guarantees (Textuals) [Abstract]          
Successor Notes 1,000.0        
Restricted cash and cash equivalents 66,900,000        
Total consideration received by Company related to accounts receivable sold under securitization program 724,700,000        
Cash up front from sale of receivables 403,600,000        
Additional cash upon collection of underlying receivables 55,700,000        
Non-collected receivables 265,400,000        
Expense associated with securitization transactions 2,500,000 $ 800,000      
Restricted Cash and Investments, Current 80,700,000   $ 54,300,000    
Restricted Cash and Investments, Noncurrent 88,000,000   71,400,000    
Securitization Purchase Limit 250,000,000        
Collateral Posted, Mining and Reclamation Obligations 506,000,000   457,900,000    
DTA and PBGC          
Guarantee Obligations [Line Items]          
Letters of credit outstanding, amount $ 37,000,000        
Pension Plans Agreement With PBGC and TXU Europe          
Financial Instruments, Guarantees with Off-Balance-Sheet Risk and Other Guarantees (Textuals) [Abstract]          
Defined benefit pension plans requiring special contributions 2        
Letter of credit maintained by the Company in favor of the PBGC $ 37,000,000        
Guarantee in place from TXU Europe Limited 110,000,000        
Reclamation Obligations          
Guarantee Obligations [Line Items]          
Financial instruments with off-balance sheet risk 1,508,600,000        
Lease Obligations          
Guarantee Obligations [Line Items]          
Financial instruments with off-balance sheet risk 93,800,000        
Workers' Compensation Obligations          
Guarantee Obligations [Line Items]          
Financial instruments with off-balance sheet risk 59,800,000        
Other          
Guarantee Obligations [Line Items]          
Financial instruments with off-balance sheet risk [1] 102,700,000        
Financial Standby Letter of Credit [Member]          
Guarantee Obligations [Line Items]          
Financial instruments with off-balance sheet risk 364,600,000        
Self bonding          
Guarantee Obligations [Line Items]          
Financial instruments with off-balance sheet risk 894,700,000        
Self bonding | Reclamation Obligations          
Guarantee Obligations [Line Items]          
Financial instruments with off-balance sheet risk 894,700,000        
Self bonding | Lease Obligations          
Guarantee Obligations [Line Items]          
Financial instruments with off-balance sheet risk 0        
Self bonding | Workers' Compensation Obligations          
Guarantee Obligations [Line Items]          
Financial instruments with off-balance sheet risk 0        
Self bonding | Other          
Guarantee Obligations [Line Items]          
Financial instruments with off-balance sheet risk [1] 0        
Self bonding | Financial Standby Letter of Credit [Member]          
Guarantee Obligations [Line Items]          
Financial instruments with off-balance sheet risk 0        
Surety bonds          
Guarantee Obligations [Line Items]          
Financial instruments with off-balance sheet risk 475,300,000        
Surety bonds | Reclamation Obligations          
Guarantee Obligations [Line Items]          
Financial instruments with off-balance sheet risk 348,400,000        
Surety bonds | Lease Obligations          
Guarantee Obligations [Line Items]          
Financial instruments with off-balance sheet risk 93,800,000        
Surety bonds | Workers' Compensation Obligations          
Guarantee Obligations [Line Items]          
Financial instruments with off-balance sheet risk 19,100,000        
Surety bonds | Other          
Guarantee Obligations [Line Items]          
Financial instruments with off-balance sheet risk [1] 14,000,000        
Surety bonds | Financial Standby Letter of Credit [Member]          
Guarantee Obligations [Line Items]          
Financial instruments with off-balance sheet risk 73,400,000        
Bank guarantees          
Guarantee Obligations [Line Items]          
Financial instruments with off-balance sheet risk 83,200,000        
Bank guarantees | Reclamation Obligations          
Guarantee Obligations [Line Items]          
Financial instruments with off-balance sheet risk 57,800,000        
Bank guarantees | Lease Obligations          
Guarantee Obligations [Line Items]          
Financial instruments with off-balance sheet risk 0        
Bank guarantees | Workers' Compensation Obligations          
Guarantee Obligations [Line Items]          
Financial instruments with off-balance sheet risk 0        
Bank guarantees | Other          
Guarantee Obligations [Line Items]          
Financial instruments with off-balance sheet risk [1] 25,400,000        
Bank guarantees | Financial Standby Letter of Credit [Member]          
Guarantee Obligations [Line Items]          
Financial instruments with off-balance sheet risk 83,500,000        
Standby Letters of Credit [Member]          
Guarantee Obligations [Line Items]          
Financial instruments with off-balance sheet risk 311,700,000        
Standby Letters of Credit [Member] | Reclamation Obligations          
Guarantee Obligations [Line Items]          
Financial instruments with off-balance sheet risk 207,700,000        
Standby Letters of Credit [Member] | Lease Obligations          
Guarantee Obligations [Line Items]          
Financial instruments with off-balance sheet risk 0        
Standby Letters of Credit [Member] | Workers' Compensation Obligations          
Guarantee Obligations [Line Items]          
Financial instruments with off-balance sheet risk 40,700,000        
Standby Letters of Credit [Member] | Other          
Guarantee Obligations [Line Items]          
Financial instruments with off-balance sheet risk [1] 63,300,000        
Standby Letters of Credit [Member] | Financial Standby Letter of Credit [Member]          
Guarantee Obligations [Line Items]          
Financial instruments with off-balance sheet risk 207,700,000        
Performance guarantee for third-party coal producer          
Financial Instruments, Guarantees with Off-Balance-Sheet Risk and Other Guarantees (Textuals) [Abstract]          
Carrying amount of guarantee liability for reclamation and bonding commitments     $ (38,400,000)    
DIP Facility - Initially Available [Member]          
Guarantee Obligations [Line Items]          
Long-term debt         $ 200,000,000
Wyoming [Member] | Self bonding | Reclamation Obligations          
Guarantee Obligations [Line Items]          
Letters of credit in support of reclamation obligations or activities       $ 800,000  
Indiana [Member] | Self bonding | Reclamation Obligations          
Guarantee Obligations [Line Items]          
Letters of credit in support of reclamation obligations or activities       7,500,000  
Illinois [Member] | Self bonding | Reclamation Obligations          
Guarantee Obligations [Line Items]          
Letters of credit in support of reclamation obligations or activities       $ 3,200,000  
U.S Mining [Member]          
Financial Instruments, Guarantees with Off-Balance-Sheet Risk and Other Guarantees (Textuals) [Abstract]          
Reclamation bonding requirements 1,243,100,000        
Costs Incurred, Asset Retirement Obligation Incurred 476,700,000        
Australian Mining [Member]          
Financial Instruments, Guarantees with Off-Balance-Sheet Risk and Other Guarantees (Textuals) [Abstract]          
Costs Incurred, Asset Retirement Obligation Incurred $ 271,300,000        
[1] Other includes the $37.0 million in letters of credit related to TXU Europe Limited described below and an additional $65.7 million in bank guarantees, letters of credit and surety bonds related to collateral for road maintenance, performance guarantees and other operations.