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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2018
Receivables [Abstract]  
Schedule of Accounts Receivable
Accounts receivable, net are summarized as follows ($ in millions):
 
December 31,
 
2018
 
2017
Trade receivables
$
130.9

 
$
120.2

Business tax credits, including VAT
4.0

 
4.3

Hedge contracts receivable
2.1

 
4.8

Other receivables
19.3

 
21.1

Less allowance for doubtful accounts and sales discounts
(1.7
)
 
(1.0
)
Total accounts receivable, net
$
154.6

 
$
149.4

Analysis of Allowances for Doubtful Accounts:
($ in millions)
 
For the Years Ended December 31,
 
2018
 
2017
 
2016
Allowance for Doubtful Accounts
 
 
 
 
 
Beginning balance
$
1.0

 
$
0.8

 
$
0.4

Bad debt expense
1.2

 
0.8

 
0.4

Recoveries
(0.2
)
 
—

 
—

Write-offs and discounts
(0.3
)
 
(0.6
)
 
—

Ending balance
$
1.7

 
$
1.0

 
$
0.8