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Defined Benefit Pension Plans (Tables)
 6 Months Ended
Jun. 30, 2015
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
2015
 
2014
 
2015
 
2014
Service cost
$
1.0

 
$
0.9

 
$
2.0

 
$
1.9

Interest cost
3.4

 
3.6

 
6.8

 
7.3

Expected return on plan assets
(3.8
)
 
(4.2
)
 
(7.6
)
 
(8.5
)
Amortization of prior service cost
0.1

 
—

 
0.2

 
—

Amortization of net loss
1.8

 
1.4

 
3.6

 
2.8

Net periodic pension cost
$
2.5

 
$
1.7

 
$
5.0

 
$
3.5