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Defined Benefit Pension Plans (Tables)
 3 Months Ended
Mar. 31, 2012
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 March 31,
Dollar amounts in millions
2012
 
2011
Service cost
$
0.9

 
$
0.8

Interest cost
3.7

 
4.0

Expected return on plan assets
(4.3
)
 
(4.5
)
Amortization of prior service cost
0.1

 
0.1

Amortization of net loss
1.7

 
1.1

Net periodic pension cost
$
2.1

 
$
1.5