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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, 2012
Postretirement Health Care and Life Insurance Benefits [Member]
  
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,
 
2012
 
2011
 
2010
 
(Dollars in millions)
Service cost for benefits earned
$
14.9

 
$
13.9

 
$
12.9

Interest cost on accumulated postretirement benefit obligation
54.9

 
57.9

 
58.2

Amortization of prior service cost
2.5

 
2.8

 
2.6

Amortization of actuarial loss
32.8

 
26.9

 
24.9

Net periodic postretirement benefit cost
$
105.1

 
$
101.5

 
$
98.6
Amounts recognized in accumulated other comprehensive loss
The following includes pre-tax amounts recorded in "Accumulated other comprehensive income (loss)":
 
Year Ended December 31,
 
2012
 
2011
 
2010
 
(Dollars in millions)
Net actuarial (gain) loss arising during year
$
(68.3
)
 
$
86.0

 
$
45.3

Prior service (credit) cost arising during year
(31.9
)
 
(1.4
)
 
7.9

Amortization:
 

 
 

 
 

Actuarial loss
(32.8
)
 
(26.9
)
 
(24.9
)
Prior service cost
(2.5
)
 
(2.8
)
 
(2.6
)
Total recorded in other comprehensive (income) loss
(135.5
)
 
54.9

 
25.7

Net periodic postretirement benefit cost
105.1

 
101.5

 
98.6

Net periodic postretirement benefit cost, net of amounts recorded in other comprehensive (income) loss
$
(30.4
)
 
$
156.4

 
$
124.3
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,
 
2012
 
2011
 
(Dollars in millions)
Change in benefit obligation:
 

 
 

Accumulated postretirement benefit obligation at beginning of period
$
1,121.5

 
$
1,031.2

Service cost
14.9

 
13.9

Interest cost
54.9

 
57.9

Participant contributions
2.3

 
1.9

Plan changes(1)
(31.9
)
 
(1.4
)
Benefits paid
(67.3
)
 
(68.0
)
Actuarial (gain) loss
(68.3
)
 
86.0

Accumulated postretirement benefit obligation at end of period
1,026.1

 
1,121.5

Change in plan assets:
 

 
 

Fair value of plan assets at beginning of period
—

 
—

Employer contributions
65.0

 
66.1

Participant contributions
2.3

 
1.9

Benefits paid and administrative fees (net of Medicare Part D reimbursements)
(67.3
)
 
(68.0
)
Fair value of plan assets at end of period
—

 
—

Funded status at end of year
(1,026.1
)
 
(1,121.5
)
Less current portion (included in "Accounts payable and accrued expenses")
65.4

 
68.4

Noncurrent obligation (included in "Accrued postretirement benefit costs")
$
(960.7
)
 
$
(1,053.1
)
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,
 
2012
 
2011
Discount rate
4.21
%
 
5.05
%
Rate of compensation increase
N/A

 
N/A

Measurement date
December 31, 2012

 
December 31, 2011
Weighted-average assumptions used to determine net periodic benefit cost
The weighted-average assumptions used to determine net periodic benefit cost during each year were as follows:
 
Year Ended December 31,
 
2012
 
2011
 
2010
Discount rate
5.05
%
 
5.81
%
 
6.14
%
Rate of compensation increase
N/A

 
3.50
%
 
3.50
%
Measurement date
December 31, 2011

 
December 31, 2010

 
December 31, 2009
Assumed health care cost trend rate
The following presents information about the assumed health care cost trend rate:
 
Year Ended December 31,
 
2012
 
2011
Health care cost trend rate assumed for next year
6.43
%
 
9.00
%
Rate to which the cost trend is assumed to decline (the ultimate trend rate)
4.67
%
 
5.00
%
Year that the rate reaches the ultimate trend rate
2023

 
2018
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)
$
18.1

 
$
(15.6
)
Effect on total postretirement benefit obligation (1)
$
107.5

 
$
(93.0
)
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)
2013
$
65.4

2014
66.5

2015
67.6

2016
68.8

2017
69.5

Years 2018-2022
355.7