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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, 2016
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,
 
2016
 
2015
 
2014
 
(Dollars in millions)
Service cost for benefits earned
$
10.4

 
$
11.2

 
$
12.2

Interest cost on accumulated postretirement benefit obligation
34.5

 
33.8

 
36.4

Amortization of prior service (credit) cost
(9.2
)
 
(6.8
)
 
1.3

Amortization of actuarial loss
20.4

 
24.9

 
14.5

Special termination benefits (1)
—

 
—

 
1.6

Net periodic postretirement benefit cost
$
56.1

 
$
63.1

 
$
66.0


(1)
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,
 
2016
 
2015
 
2014
 
(Dollars in millions)
Net actuarial loss (gain) arising during year
$
32.3

 
$
(35.1
)
 
$
115.8

Prior service credit arising during year
—

 
—

 
(18.0
)
Amortization:
 

 
 

 
 

Actuarial loss
(20.4
)
 
(24.9
)
 
(14.5
)
Prior service credit (cost)
9.2

 
6.8

 
(1.3
)
Settlement related to the Patriot bankruptcy: (1)
 
 
 
 
 
Prior service cost
7.2

 
(16.6
)
 
—

Total recorded in "Accumulated other comprehensive loss"
$
28.3

 
$
(69.8
)
 
$
82.0


(1)
Refer to Note 27. "Matters Related to the Bankruptcy 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,
 
2016
 
2015
 
(Dollars in millions)
Change in benefit obligation:
 

 
 

Accumulated postretirement benefit obligation at beginning of period
$
776.1

 
$
839.1

Service cost
10.4

 
11.2

Interest cost
34.5

 
33.8

Participant contributions
0.6

 
1.7

Plan changes(1)
7.2

 
(16.6
)
Benefits paid
(49.0
)
 
(46.5
)
Actuarial loss (gain)
32.3

 
(35.1
)
Settlement related to the Patriot bankruptcy (1)
—

 
(15.2
)
Other
—

 
3.7

Accumulated postretirement benefit obligation at end of period
812.1

 
776.1

Change in plan assets:
 

 
 

Fair value of plan assets at beginning of period
—

 
—

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
—

 
—

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.
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,
 
2016
 
2015
Discount rate
4.15
%
 
4.50
%
Measurement date
December 31, 2016

 
December 31, 2015


The weighted-average assumptions used to determine net periodic benefit cost during each year were as follows:
 
Year Ended December 31,
 
2016
 
2015
 
2014
Discount rate
4.50
%
 
4.10
%
 
4.90
%
Measurement date
December 31, 2015

 
December 31, 2014

 
December 31, 2013
Assumed health care cost trend rate
The following presents information about the assumed health care cost trend rate:
 
Year Ended December 31,
 
2016
 
2015
Pre-Medicare:
 
 
 
Health care cost trend rate assumed for next year
6.20
%
 
6.60
%
Rate to which the cost trend is assumed to decline (the ultimate trend rate)
4.75
%
 
4.75
%
Year that the rate reaches the ultimate trend rate
2021

 
2021

 
 
 
 
Post-Medicare:
 
 
 
Health care cost trend rate assumed for next year
5.60
%
 
5.80
%
Rate to which the cost trend is assumed to decline (the ultimate trend rate)
4.75
%
 
4.75
%
Year that the rate reaches the ultimate trend rate
2021

 
2021
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)
$
3.6

 
$
(3.2
)
Effect on total postretirement benefit obligation (1)
$
67.0

 
$
(61.9
)

(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 10.31 years at January 1, 2017.
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)
2017
$
55.0

2018
56.2

2019
57.0

2020
57.5

2021
61.3

Years 2022-2026
290.3