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Financial Instruments, Guarantees with Off-Balance-Sheet Risk and Other Guarantees (Details)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jul. 26, 2016
USD ($)
Apr. 29, 2016
USD ($)
Apr. 18, 2016
USD ($)
Apr. 15, 2016
USD ($)
Apr. 13, 2016
USD ($)
Dec. 31, 2015
USD ($)
Guarantee Obligations [Line Items]                      
Financial instruments with off-balance sheet risk   $ 2,137.9   $ 2,137.9              
Letters of credit in support of reclamation obligations or activities   15.7   15.7              
Amount in bank guarantees, letters of credit and surety bonds related to collateral for road maintenance, performance guarantees and other operations   146.1   146.1              
Amount in letters of credit issued as collateral to support Patriot surety bonds   72.5   72.5              
Financial Instruments, Guarantees with Off-Balance-Sheet Risk and Other Guarantees (Textuals) [Abstract]                      
Maximum capacity of the securitization program   180.0   180.0             $ 275.0
Restricted cash and cash equivalents   47.1   47.1              
Total consideration received by Company related to accounts receivable sold under securitization program       1,298.1              
Cash up front from sale of receivables       635.0              
Additional cash upon collection of underlying receivables       494.8              
Non-collected receivables   168.3   168.3              
Reduction in accounts receivable as a result of securitization activity   0.0   0.0             168.5
Expense associated with securitization transactions   2.4 $ 0.4 3.2 $ 0.8            
DTA and PBGC                      
Guarantee Obligations [Line Items]                      
Letters of credit outstanding, amount   $ 79.7   $ 79.7              
Dominion Terminal Associates Partnership                      
Financial Instruments, Guarantees with Off-Balance-Sheet Risk and Other Guarantees (Textuals) [Abstract]                      
Ownership Percentage in DTA   37.50%   37.50%              
DTA lease term (years)   30   30              
Maximum reimbursement obligation to commercial bank related to Dominion Terminals Associates   $ 42.7   $ 42.7              
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   2              
Letter of credit maintained by the Company in favor of the PBGC   $ 37.0   $ 37.0              
Guarantee in place from TXU Europe Limited   110.0   110.0              
Reclamation Obligations                      
Guarantee Obligations [Line Items]                      
Financial instruments with off-balance sheet risk   1,730.2   1,730.2              
Lease Obligations                      
Guarantee Obligations [Line Items]                      
Financial instruments with off-balance sheet risk   107.6   107.6              
Workers' Compensation Obligations                      
Guarantee Obligations [Line Items]                      
Financial instruments with off-balance sheet risk   74.3   74.3              
Other                      
Guarantee Obligations [Line Items]                      
Financial instruments with off-balance sheet risk [1]   225.8   225.8              
Financial Standby Letter of Credit [Member]                      
Guarantee Obligations [Line Items]                      
Financial instruments with off-balance sheet risk   443.7   443.7              
Self bonding                      
Guarantee Obligations [Line Items]                      
Financial instruments with off-balance sheet risk   1,140.3   1,140.3              
Self bonding | Reclamation Obligations                      
Guarantee Obligations [Line Items]                      
Financial instruments with off-balance sheet risk   1,140.3   1,140.3              
Self bonding | Lease Obligations                      
Guarantee Obligations [Line Items]                      
Financial instruments with off-balance sheet risk   0.0   0.0              
Self bonding | Workers' Compensation Obligations                      
Guarantee Obligations [Line Items]                      
Financial instruments with off-balance sheet risk   0.0   0.0              
Self bonding | Other                      
Guarantee Obligations [Line Items]                      
Financial instruments with off-balance sheet risk [1]   0.0   0.0              
Self bonding | Financial Standby Letter of Credit [Member]                      
Guarantee Obligations [Line Items]                      
Financial instruments with off-balance sheet risk   0.0   0.0              
Surety bonds                      
Guarantee Obligations [Line Items]                      
Financial instruments with off-balance sheet risk   462.8   462.8              
Surety bonds | Reclamation Obligations                      
Guarantee Obligations [Line Items]                      
Financial instruments with off-balance sheet risk   321.0   321.0              
Surety bonds | Lease Obligations                      
Guarantee Obligations [Line Items]                      
Financial instruments with off-balance sheet risk   107.6   107.6              
Surety bonds | Workers' Compensation Obligations                      
Guarantee Obligations [Line Items]                      
Financial instruments with off-balance sheet risk   19.1   19.1              
Surety bonds | Other                      
Guarantee Obligations [Line Items]                      
Financial instruments with off-balance sheet risk [1]   15.1   15.1              
Surety bonds | Financial Standby Letter of Credit [Member]                      
Guarantee Obligations [Line Items]                      
Financial instruments with off-balance sheet risk [2]   112.6   112.6              
Bank guarantees                      
Guarantee Obligations [Line Items]                      
Financial instruments with off-balance sheet risk   329.6   329.6              
Bank guarantees | Reclamation Obligations                      
Guarantee Obligations [Line Items]                      
Financial instruments with off-balance sheet risk   268.9   268.9              
Bank guarantees | Lease Obligations                      
Guarantee Obligations [Line Items]                      
Financial instruments with off-balance sheet risk   0.0   0.0              
Bank guarantees | Workers' Compensation Obligations                      
Guarantee Obligations [Line Items]                      
Financial instruments with off-balance sheet risk   0.0   0.0              
Bank guarantees | Other                      
Guarantee Obligations [Line Items]                      
Financial instruments with off-balance sheet risk [1]   60.7   60.7              
Bank guarantees | Financial Standby Letter of Credit [Member]                      
Guarantee Obligations [Line Items]                      
Financial instruments with off-balance sheet risk   331.1   331.1              
Standby Letters of Credit [Member]                      
Guarantee Obligations [Line Items]                      
Financial instruments with off-balance sheet risk   205.2   205.2              
Standby Letters of Credit [Member] | Reclamation Obligations                      
Guarantee Obligations [Line Items]                      
Financial instruments with off-balance sheet risk   0.0   0.0              
Standby Letters of Credit [Member] | Lease Obligations                      
Guarantee Obligations [Line Items]                      
Financial instruments with off-balance sheet risk   0.0   0.0              
Standby Letters of Credit [Member] | Workers' Compensation Obligations                      
Guarantee Obligations [Line Items]                      
Financial instruments with off-balance sheet risk   55.2   55.2              
Standby Letters of Credit [Member] | Other                      
Guarantee Obligations [Line Items]                      
Financial instruments with off-balance sheet risk [1]   150.0   150.0              
Standby Letters of Credit [Member] | Financial Standby Letter of Credit [Member]                      
Guarantee Obligations [Line Items]                      
Financial instruments with off-balance sheet risk   0.0   0.0              
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   $ (38.4)   $ (38.4)             $ (38.4)
Scenario, Forecast [Member] | Dominion Terminal Associates Partnership                      
Financial Instruments, Guarantees with Off-Balance-Sheet Risk and Other Guarantees (Textuals) [Abstract]                      
Repayments of lines of credit $ 39.9                    
DIP Facility - Initially Available [Member]                      
Guarantee Obligations [Line Items]                      
Long-term debt               $ 200.0 $ 200.0 $ 200.0  
Midwestern U.S. Mining [Member] | Self bonding | Reclamation Obligations                      
Guarantee Obligations [Line Items]                      
Financial instruments with off-balance sheet risk             $ 92.0        
Midwestern U.S. Mining [Member] | Scenario, Forecast [Member] | Self bonding | Reclamation Obligations                      
Guarantee Obligations [Line Items]                      
Letters of credit in support of reclamation obligations or activities           $ 7.5          
[1] Other includes the $79.7 million in letters of credit related to Dominion Terminal Associates and TXU Europe Limited described below and an additional $146.1 million in bank guarantees, letters of credit and surety bonds related to collateral for road maintenance, performance guarantees and other operations.
[2] A total of $72.5 million of letters of credit and cash collateral in support of surety bonds related to Patriot have been excluded from above as they no longer represent off-balance sheet obligations as discussed in Note 20. "Matters Related to the Bankruptcy of Patriot Coal Corporation".