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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2015
Accounts Receivable [Abstract]  
Schedule of Accounts Receivable
Accounts receivable are summarized as follows ($ in millions):
 
December 31,
 
2015
 
2014
Trade receivables
$
97.7

 
$
69.8

Business tax credits, including VAT
3.7

 
4.2

Hedge contracts receivable
0.8

 
0.4

Other receivables
17.6

 
19.8

Less allowance for doubtful accounts and sales discounts
(0.4
)
 
(0.3
)
Total accounts receivable
$
119.4

 
$
93.9