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Defined Benefit Pension Plans (Tables)
 6 Months Ended
Jun. 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 June 30,
 
Six Months Ended June 30,
Dollar amounts in millions
2011
 
2010
 
2011
 
2010
Service cost
$
0.8


 
$
0.7


 
$
1.6


 
$
1.7


Interest cost
4.0


 
4.4


 
8.0


 
9.8


Expected return on plan assets
(4.5
)
 
(4.7
)
 
(9.0
)
 
(10.7
)
Amortization of prior service cost
0.1


 
0.1


 
0.2


 
0.2


Amortization of net loss
1.1


 
1.2


 
2.2


 
2.8


Net periodic pension cost
$
1.5


 
$
1.7


 
$
3.0


 
$
3.8