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Postretirement Health Care and Life Insurance Benefits (Tables) - Postretirement Health Care and Life Insurance Benefits [Member]
 12 Months Ended
Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Components of net periodic postretirement benefit cost
Net periodic postretirement benefit cost included the following components:
 
Year Ended December 31,
 
2014
 
2013
 
2012
 
(Dollars in millions)
Service cost for benefits earned
$
12.2

 
$
15.8

 
$
14.9

Interest cost on accumulated postretirement benefit obligation
36.4

 
41.8

 
54.9

Amortization of prior service cost (credit)
1.3

 
(1.7
)
 
2.5

Amortization of actuarial loss
14.5

 
24.1

 
32.8

Settlement related to the Patriot bankruptcy reorganization (1)
—

 
63.2

 
—

Special termination benefits (2)
1.6

 
0.9

 
—

Net periodic postretirement benefit cost
$
66.0

 
$
144.1

 
$
105.1


(1)
Refer to Note 25. "Matters Related to the Bankruptcy Reorganization of Patriot Coal Corporation" herein for additional details related to this transaction.
(2)
Reflected in "Restructuring and pension settlement charges" in the consolidated statement of operations for the year ended December 31, 2014.
Amounts recognized in accumulated other comprehensive loss
The following includes pre-tax amounts recorded in "Accumulated other comprehensive loss":
 
Year Ended December 31,
 
2014
 
2013
 
2012
 
(Dollars in millions)
Net actuarial loss (gain) arising during year
$
115.8

 
$
(24.3
)
 
$
(68.3
)
Prior service credit arising during year
(18.0
)
 
—

 
(31.9
)
Amortization:
 

 
 

 
 

Actuarial loss
(14.5
)
 
(24.1
)
 
(32.8
)
Prior service (cost) credit
(1.3
)
 
1.7

 
(2.5
)
Settlement related to the Patriot bankruptcy reorganization: (1)
 
 
 
 
 
Actuarial loss
—

 
(61.3
)
 
—

Prior service cost
—

 
(1.9
)
 
—

Total recorded in other comprehensive loss (income)
$
82.0

 
$
(109.9
)
 
$
(135.5
)

(1)
Refer to Note 25. "Matters Related to the Bankruptcy Reorganization of Patriot Coal Corporation" herein for additional details related to this transaction.
Reconciled amount of plan's funded status
The following table sets forth the plans' funded status reconciled with the amounts shown in the consolidated balance sheets:
 
December 31,
 
2014
 
2013
 
(Dollars in millions)
Change in benefit obligation:
 

 
 

Accumulated postretirement benefit obligation at beginning of period
$
735.4

 
$
1,026.1

Service cost
12.2

 
15.8

Interest cost
36.4

 
41.8

Participant contributions
2.2

 
2.3

Plan changes(1)
(18.0
)
 
—

Benefits paid
(46.5
)
 
(66.5
)
Actuarial loss (gain) (2)
115.8

 
(24.3
)
Settlement related to the Patriot bankruptcy reorganization (3)
—

 
(260.7
)
Special termination benefits
1.6

 
0.9

Accumulated postretirement benefit obligation at end of period
839.1

 
735.4

Change in plan assets:
 

 
 

Fair value of plan assets at beginning of period
—

 
—

Employer contributions
44.3

 
64.2

Participant contributions
2.2

 
2.3

Benefits paid and administrative fees (net of Medicare Part D reimbursements)
(46.5
)
 
(66.5
)
Fair value of plan assets at end of period
—

 
—

Funded status at end of year
(839.1
)
 
(735.4
)
Less: Current portion (included in "Accounts payable and accrued expenses")
57.2

 
51.4

Noncurrent obligation (included in "Accrued postretirement benefit costs")
$
(781.9
)
 
$
(684.0
)
(1) 
Includes the net impact of the following plan changes: a $45.4 million reduction to the benefit obligation related to various plan changes effective January 1, 2015 for certain plan participants that are designed to bring consistency amongst the various retiree medical programs; and a $27.6 million increase to the benefit obligation resulting from a plan change effective April 1, 2014 for certain plan participants' benefits no longer funded through a Medicare Advantage Program. The plan changes will not affect participant benefits.
(2) 
During 2014, the Company reviewed its demographic assumptions (including mortality, retirements and terminations) in conjunction with the recently-issued mortality tables published by the Society of Actuaries, to select assumptions that are aligned with the Company’s experience. The updated demographic assumptions increased the December 31, 2014 benefit obligation by approximately $63 million. 
(3) 
Refer to Note 25. "Matters Related to the Bankruptcy Reorganization of Patriot Coal Corporation" herein for additional details related to this transaction.
Weighted-average assumptions used to determine the benefit obligations
The weighted-average assumptions used to determine the benefit obligations as of the end of each year were as follows:
 
December 31,
 
2014
 
2013
Discount rate
4.10
%
 
4.90
%
Measurement date
December 31, 2014

 
December 31, 2013


The weighted-average assumptions used to determine net periodic benefit cost during each year were as follows:
 
Year Ended December 31,
 
2014
 
2013
 
2012
Discount rate
4.90
%
 
4.21
%
 
5.05
%
Measurement date
December 31, 2013

 
December 31, 2012

 
December 31, 2011
Assumed health care cost trend rate
The following presents information about the assumed health care cost trend rate:
 
Year Ended December 31,
 
2014
 
2013
Pre-Medicare:
 
 
 
Health care cost trend rate assumed for next year
7.00
%
 
6.26
%
Rate to which the cost trend is assumed to decline (the ultimate trend rate)
4.75
%
 
4.67
%
Year that the rate reaches the ultimate trend rate
2021

 
2023

 
 
 
 
Post-Medicare:
 
 
 
Health care cost trend rate assumed for next year
6.00
%
 
6.26
%
Rate to which the cost trend is assumed to decline (the ultimate trend rate)
4.75
%
 
4.67
%
Year that the rate reaches the ultimate trend rate
2021

 
2023
Assumed health care cost trend rates, one percentage point increase
A one-percentage-point change in the assumed health care cost trend would have the following effects:
 
One Percentage-
Point Increase
 
One Percentage-
Point Decrease
 
(Dollars in millions)
Effect on total service and interest cost components (1)
$
4.1

 
$
(3.8
)
Effect on total postretirement benefit obligation (1)
$
80.6

 
$
(70.3
)

(1) 
In addition to the effect on total service and interest cost components of expense, changes in trend rates would also increase or decrease the actuarial gain or loss amortization expense component. The impact on actuarial gain or loss amortization would approximate the increase or decrease in the obligation divided by 11.70 years at January 1, 2015.
Summary of estimated future benefit payments
The following benefit payments (net of retiree contributions), which reflect expected future service, as appropriate, are expected to be paid by the Company:
 
Postretirement
 
Benefits
 
(Dollars in millions)
2015
$
57.2

2016
59.0

2017
59.9

2018
60.4

2019
60.7

Years 2020-2024
297.6