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Pension and Postretirement Plans (Tables)
 3 Months Ended
Mar. 31, 2013
General Discussion of Pension and Other Postretirement Benefits [Abstract]  
Schedule of Net Benefit Costs [Table Text Block]
For the three months ended March 31, 2013 and 2012, pension and postretirement benefit costs were as follows:
 
Three Months Ended March 31,
 
2013
 
2012
 
2013
 
2012
(dollars in millions)
Pension Benefits
 
Postretirement and
Other Benefits
Service cost
$
0.6

 
$
0.6

 
$
0.1

 
$
0.1

Interest cost on projected benefit obligation
5.2

 
6.1

 
1.3

 
1.6

Expected return on plan assets
(6.1
)
 
(6.9
)
 
—

 
—

Amortization of:
 
 
 
 
 
 
 
Prior service cost (benefit)
—

 
—

 
(3.2
)
 
(3.3
)
Actuarial loss
6.0

 
3.9

 
1.6

 
1.6

       Total amortization
6.0

 
3.9

 
(1.6
)
 
(1.7
)
Benefit costs
$
5.7

 
$
3.7

 
$
(0.2
)
 
$
—