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ALLOWANCE FOR DOUBTFUL ACCOUNTS RECEIVABLES
 12 Months Ended
Dec. 31, 2011
ALLOWANCE FOR DOUBTFUL ACCOUNTS RECEIVABLES [Abstract]  
ALLOWANCE FOR DOUBTFUL ACCOUNTS RECEIVABLES

ALLOWANCE FOR DOUBTFUL ACCOUNTS RECEIVABLES

Allowance for doubtful accounts receivable consisted of the following:

   
December 31,
 
   
2011
   
2010
 
   
($ in millions)
 
Beginning balance
 
$
4.8
   
$
3.3
 
Provisions charged (credited)
   
0.8
     
(0.3
)
(Write-offs) recoveries, net
   
(2.4
)
   
1.8
 
Ending balance
 
$
3.2
   
$
4.8