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ALLOWANCE FOR DOUBTFUL ACCOUNTS RECEIVABLES (Tables)
 9 Months Ended
Sep. 30, 2015
Accounts Receivable, Net [Abstract]  
Allowance for Doubtful Accounts Receivable
Allowance for doubtful accounts receivable consisted of the following:
 
September 30,
 
2015
 
2014
 
($ in millions)
Balance at beginning of year
$
3.0

 
$
3.4

Provisions (credited) charged
(0.4
)
 
0.5

Write-offs, net of recoveries
(0.1
)
 
(0.4
)
Balance at end of period
$
2.5

 
$
3.5