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Postretirement Benefits Other Than Pensions (Tables) (Other Postretirement Benefit Plans, Defined Benefit [Member])
 12 Months Ended
Dec. 31, 2012
Other Postretirement Benefit Plans, Defined Benefit [Member]
  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Changes in Fair Value of Plan Assets [Table Text Block]
Changes in Fair Value of Plan Assets and Changes in Accumulated Benefit Obligation for the years ended December 31, 2012 and 2011 were:
DOLLARS IN MILLIONS
 
 
2012
 
2011
Fair Value of Plan Assets at Beginning of Year
 
$
—

 
$
—

Employer Contributions
 
3.0

 
3.2

Plan Participants’ Contributions
 
1.0

 
1.1

Benefits Paid
 
(4.0
)
 
(4.3
)
Fair Value of Plan Assets at End of Year
 
—

 
—

Benefit Obligation at Beginning of Year
 
44.7

 
41.1

Service Cost
 
0.2

 
0.1

Interest Cost
 
1.6

 
1.9

Plan Participants’ Contributions
 
1.0

 
1.1

Benefits Paid
 
(4.0
)
 
(4.3
)
Modernization Act Subsidy Received
 
1.0

 
0.4

Actuarial (Gains) Losses
 
(5.5
)
 
4.4

Obligations Transferred Into Plan
 
3.8

 
—

Benefit Obligation at End of Year
 
42.8

 
44.7

Funded Status—Benefit Obligation in Excess of Plan Assets
 
$
(42.8
)
 
$
(44.7
)
 
 
 
 
 
Actuarial Gain Recognized in Accumulated Other Comprehensive Income
 
$
13.4

 
$
9.2
Schedule of Assumptions Used [Table Text Block]
The actuarial assumptions used to develop the components of the Accumulated Benefit Obligation at December 31, 2012 and 2011 were:
 
 
2012
 
2011
Discount Rate
 
3.15
%
 
4.25
%
Rate of Increase in Future Compensation Levels
 
2.10

 
2.10

The actuarial assumptions used to develop the components of the OPEB Expense for the years ended December 31, 2012, 2011 and 2010 were:
 
 
2012
 
2011
 
2010
Discount Rate
 
4.25
%
 
4.40
%
 
5.25
%
Rate of Increase in Future Compensation Levels
 
2.10

 
1.50

 
1.50
Schedule of Comprehensive Other Postretirement Employee Benefit Expense [Table Text Block]
The components of Comprehensive OPEB Expense for the years ended December 31, 2012, 2011 and 2010 were:
DOLLARS IN MILLIONS
 
2012
 
2011
 
2010
Service Cost Earned During the Year
 
$
0.2

 
$
0.1

 
$
0.1

Interest Cost on Accumulated Benefit Obligation
 
1.6

 
1.9

 
2.1

Net Amortization and Deferral
 
(1.2
)
 
(0.6
)
 
(1.1
)
OPEB Expense Recognized
 
0.6

 
1.4

 
1.1

Unrecognized OPEB (Gain) Loss Arising During the Year
 
(5.5
)
 
4.4

 
4.3

Amortization of Accumulated Unrecognized OPEB Gain
 
1.2

 
0.6

 
1.1

Comprehensive OPEB Expense (Benefit)
 
$
(3.7
)
 
$
6.4

 
$
6.5
Schedule of Expected Benefit Payments [Table Text Block]
The following benefit payments (net of participant contributions), which consider expected future service, as appropriate, are expected to be paid:
DOLLARS IN MILLIONS
 
Years Ending December 31,
2013
 
2014
 
2015
 
2016
 
2017
 
2018-2022
Benefit Payments:
 
 
 
 
 
 
 
 
 
 
 
 
Excluding Modernization Act Subsidy
 
$
4.8

 
$
4.8

 
$
4.8

 
$
4.7

 
$
4.6

 
$
19.3

Expected Modernization Act Subsidy
 
(0.5
)
 
(0.5
)
 
(0.6
)
 
(0.6
)
 
(0.6
)
 
(2.4
)
Net Benefit Payments
 
$
4.3

 
$
4.3

 
$
4.2

 
$
4.1

 
$
4.0

 
$
16.9