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Defined Benefit Pension Plans (Tables)
 9 Months Ended
Sep. 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 September 30,
 
Nine Months Ended September 30,
Dollar amounts in millions
2017
 
2016
 
2017
 
2016
Service cost
$
1.4

 
$
1.2

 
$
4.1

 
$
3.6

Interest cost
3.3

 
3.3

 
9.7

 
10.1

Expected return on plan assets
(3.3
)
 
(3.3
)
 
(9.8
)
 
(10.0
)
Amortization of prior service cost 1
0.2

 
0.1

 
0.6

 
0.3

Amortization of net loss 1
1.4

 
1.4

 
4.2

 
4.1

Net periodic pension cost
$
3.0

 
$
2.7

 
$
8.8

 
$
8.1