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ALLOWANCE FOR DOUBTFUL ACCOUNTS RECEIVABLES (Tables)
 9 Months Ended
Sep. 30, 2013
Accounts Receivable, Net [Abstract]  
Allowance for Doubtful Accounts Receivable
Allowance for doubtful accounts receivable consisted of the following:
 
September 30,
 
2013
 
2012
 
($ in millions)
Balance at beginning of year
$
3.6

 
$
3.2

Provisions charged
0.2

 
0.6

Write-offs, net of recoveries
(0.1
)
 
(0.1
)
Balance at end of period
$
3.7

 
$
3.7