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Defined Benefit Pension Plans (Tables)
 9 Months Ended
Sep. 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 September 30,
 
Nine Months Ended September 30,
Dollar amounts in millions
2015
 
2014
 
2015
 
2014
Service cost
$
1.0

 
$
0.9

 
$
3.1

 
$
2.8

Interest cost
3.4

 
3.7

 
10.2

 
11.0

Expected return on plan assets
(3.8
)
 
(4.2
)
 
(11.4
)
 
(12.7
)
Amortization of prior service cost
0.1

 
—

 
0.3

 
—

Amortization of net loss
1.7

 
1.4

 
5.2

 
4.2

Net periodic pension cost
$
2.4

 
$
1.8

 
$
7.4

 
$
5.3

Loss due to settlement
$
0.4

 
$
—

 
$
0.4

 
$
—