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ALLOWANCE FOR DOUBTFUL ACCOUNTS RECEIVABLES (Tables)
 6 Months Ended
Jun. 30, 2016
Accounts Receivable, Net [Abstract]  
Allowance for Doubtful Accounts Receivable
Allowance for doubtful accounts receivable consisted of the following:
 
June 30,
 
2016
 
2015
 
($ in millions)
Balance at beginning of year
$
6.4

 
$
3.0

Provisions charged (credited)
2.2

 
(0.2
)
Write-offs, net of recoveries
(0.8
)
 
(0.1
)
Balance at end of period
$
7.8

 
$
2.7