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Receivables (Tables)
 12 Months Ended
Dec. 31, 2016
Receivables [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
Receivables consist of the following:
 
December 31,
Dollar amounts in millions
2016
 
2015
Trade receivables
$
96.1

 
$
82.6

Income tax receivable
1.7

 
2.0

Other receivables
11.5

 
12.8

Allowance for doubtful accounts
(1.0
)
 
(1.0
)
 
$
108.3

 
$
96.4