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Defined Benefit Pension Plans (Tables)
 6 Months Ended
Jun. 30, 2017
Retirement Benefits [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
2017
 
2016
 
2017
 
2016
Service cost
$
1.4

 
$
1.2

 
$
2.7

 
$
2.4

Interest cost
3.3

 
3.3

 
6.5

 
6.7

Expected return on plan assets
(3.3
)
 
(3.3
)
 
(6.5
)
 
(6.7
)
Amortization of prior service cost 1
0.2

 
0.1

 
0.4

 
0.2

Amortization of net loss 1
1.4

 
1.4

 
2.8

 
2.8

Net periodic pension cost
$
3.0

 
$
2.7

 
$
5.9

 
$
5.4