ALLOWANCE FOR DOUBTFUL ACCOUNTS RECEIVABLES (Tables)
 6 Months Ended
Jun. 30, 2018
Accounts Receivable, Net [Abstract]  
Allowance for Doubtful Accounts Receivable
Allowance for doubtful accounts receivable consisted of the following:
 
June 30,
 
2018
 
2017
 
($ in millions)
Balance at beginning of year
$
12.3

 
$
10.1

Provisions charged
1.3

 
2.1

Foreign currency translation adjustment
(0.3
)
 
—

Balance at end of period
$
13.3

 
$
12.2