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ALLOWANCE FOR DOUBTFUL ACCOUNTS RECEIVABLES (Tables)
 12 Months Ended
Dec. 31, 2012
Accounts Receivable, Net [Abstract]  
Allowance for Doubtful Accounts Receivable
LLOWANCE FOR DOUBTFUL ACCOUNTS RECEIVABLES

Allowance for doubtful accounts receivable consisted of the following:
 
December 31,
 
 
 
2012
 
2011
 
 
 
($ in millions)
 
 
Beginning balance
$
3.2

 
$
4.8

 
 
Provisions charged
0.7

 
0.8

 
 
Write-offs, net of recoveries
(0.3
)
 
(2.4
)
 
 
Ending balance
$
3.6

 
$
3.2