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ALLOWANCE FOR DOUBTFUL ACCOUNTS RECEIVABLES (Tables)
 3 Months Ended
Mar. 31, 2019
Accounts Receivable, Net [Abstract]  
Allowance for Doubtful Accounts Receivable
Allowance for doubtful accounts receivable consisted of the following:
 
March 31,
 
2019
 
2018
 
($ in millions)
Balance at beginning of year
$
12.9

 
$
12.3

Provisions charged
0.5

 
1.1

Write-offs, net of recoveries
(0.1
)
 
—

Foreign currency translation adjustment
(0.1
)
 
—

Balance at end of period
$
13.2

 
$
13.4