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Receivables (Tables)
 6 Months Ended
Jun. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
Receivables consist of the following:
Dollar amounts in millions
June 30, 2015
 
December 31, 2014
Trade receivables
$
113.1

 
$
96.1

Interest receivables
0.2

 
0.2

Income tax receivable
3.4

 
1.4

Other receivables
8.9

 
11.7

Allowance for doubtful accounts
(1.0
)
 
(1.0
)
Total
$
124.6

 
$
108.4