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Postretirement Health Care and Life Insurance Benefits (Details 2) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]      
Increase (Decrease) in Postretirement Obligations $ 6.3 $ 18.7 $ 9.6
Reconciled amount of plans funded status      
Other 0.0 3.7  
Postretirement Health Care and Life Insurance Benefits [Member]      
Reconciled amount of plans funded status      
Projected benefit obligation at beginning of period 776.1 839.1  
Service cost 10.4 11.2 12.2
Interest cost 34.5 33.8 36.4
Participant contributions 0.6 1.7  
Plan changes [1] 7.2 (16.6)  
Benefits paid (49.0) (46.5)  
Actuarial (gain) loss [2] 32.3 (35.1)  
Settlement charges related to the Patriot bankruptcy [3] 0.0 (15.2)  
Special termination benefits [4] 0.0 0.0 1.6
Projected benefit obligation at end of period 812.1 776.1 839.1
Fair value of plan assets at beginning of period 0.0 0.0  
Employer contributions 48.4 44.8  
Participant contributions 0.6 1.7  
Benefits paid and administrative fees (net of Medicare Part D reimbursements) (49.0) (46.5)  
Fair value of plan assets at end of period 0.0 0.0 $ 0.0
Funded status at end of year (812.1) (776.1)  
Less current portion (included in Accounts payable and accrued expenses) 55.8 53.2  
Noncurrent obligation (included in Accrued postretirement benefit costs) $ (756.3) $ (722.9)  
[1] Refer to Note 27. "Matters Related to the Bankruptcy of Patriot Coal Corporation" herein for additional details related to the changes in the benefit obligation.
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[3] {F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOmM4ZGM3OGZmYTM4MTQ2ZDJhNDIwYjkyYzM3MzZjOWRhfFRleHRTZWxlY3Rpb246MzM3QUI2RjEwNDVGNTEwNkI1MjMzREM5NzU2OTBFODQM}
[4] Reflected in "Restructuring and pension settlement charges" in the consolidated statement of operations for the year ended December 31, 2014.