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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2017
Accounts Receivable [Abstract]  
Schedule of Accounts Receivable
Accounts receivable are summarized as follows ($ in millions):
 
December 31,
 
2017
 
2016
Trade receivables
$
120.2

 
$
98.2

Business tax credits, including VAT
4.3

 
3.1

Hedge contracts receivable
4.8

 
1.0

Other receivables
21.1

 
13.6

Less allowance for doubtful accounts and sales discounts
(1.0
)
 
(0.8
)
Total accounts receivable
$
149.4

 
$
115.1