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Defined Benefit Pension Plans (Tables)
9 Months Ended
Sep. 30, 2011
Compensation and Retirement Disclosure [Abstract] 
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
The net periodic pension cost included the following components:  
 
Quarter Ended September 30,
 
Nine Months Ended September 30,
Dollar amounts in millions
2011
 
2010
 
2011
 
2010
Service cost
$
0.8

 
$
0.8

 
$
2.4

 
$
2.5

Interest cost
4.0

 
4.2

 
12.0

 
13.9

Expected return on plan assets
(4.5
)
 
(4.8
)
 
(13.5
)
 
(15.4
)
Amortization of prior service cost
0.1

 
0.1

 
0.3

 
0.3

Amortization of net loss
1.1

 
1.2

 
3.3

 
4.0

Net periodic pension cost
$
1.5

 
$
1.5

 
$
4.5

 
$
5.3