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ALLOWANCE FOR DOUBTFUL ACCOUNTS RECEIVABLES (Tables)
6 Months Ended
Jun. 30, 2012
Accounts Receivable, Net [Abstract]  
Allowance for Doubtful Accounts Receivable
Allowance for doubtful accounts receivable consisted of the following:
 
June 30,
 
2012
 
2011
 
($ in millions)
Balance at beginning of year
$
3.2

 
$
4.8

Provisions charged
1.0

 
0.2

(Write-offs) recoveries, net
(0.1
)
 
0.6

Balance at end of period
$
4.1

 
$
5.6