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

 
$
3.2

Provisions charged
0.4

 
1.0

Write-offs, net of recoveries
(0.1
)
 
(0.1
)
Balance at end of period
$
3.9

 
$
4.1