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ALLOWANCE FOR DOUBTFUL ACCOUNTS RECEIVABLES (Tables)
3 Months Ended
Mar. 31, 2017
Accounts Receivable, Net [Abstract]  
Allowance for Doubtful Accounts Receivable
Allowance for doubtful accounts receivable consisted of the following:
 
March 31,
 
2017
 
2016
 
($ in millions)
Balance at beginning of year
$
10.1

 
$
6.4

Provisions charged
1.4

 
1.4

Write-offs, net of recoveries

 
(1.5
)
Balance at end of period
$
11.5

 
$
6.3