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Receivables (Tables)
3 Months Ended
Mar. 31, 2015
Receivables [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
Receivables consist of the following:
Dollar amounts in millions
March 31, 2015
 
December 31, 2014
Trade receivables
$
126.4

 
$
96.1

Interest receivables
0.6

 
0.2

Income tax receivable
1.6

 
1.4

Other receivables
9.6

 
11.7

Allowance for doubtful accounts
(1.0
)
 
(1.0
)
Total
$
137.2

 
$
108.4