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ALLOWANCE FOR DOUBTFUL ACCOUNTS RECEIVABLES (Tables)
 9 Months Ended
Sep. 30, 2017
Accounts Receivable, Net [Abstract]  
Allowance for Doubtful Accounts Receivable
Allowance for doubtful accounts receivable consisted of the following:
 
September 30,
 
2017
 
2016
 
($ in millions)
Balance at beginning of year
$
10.1

 
$
6.4

Provisions charged
1.3

 
3.6

Write-offs, net of recoveries
—

 
(0.8
)
Balance at end of period
$
11.4

 
$
9.2