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Receivables (Tables)
 9 Months Ended
Sep. 30, 2018
Receivables [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
Receivables consist of the following:
Dollar amounts in millions
September 30, 2018
 
December 31, 2017
Trade receivables
$
124.6

 
$
124.6

Income tax receivable
2.3

 
2.2

Other receivables
17.4

 
16.6

Allowance for doubtful accounts
(0.8
)
 
(0.9
)
Total
$
143.5

 
$
142.5