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ALLOWANCE FOR DOUBTFUL ACCOUNTS AND CUSTOMER DISPUTES (Tables)
 12 Months Ended
Dec. 31, 2019
Receivables [Abstract]  
Schedule of Activity in Allowance for Doubtful Accounts and Customer Disputes

($ in millions)
 
2019
 
2018
Balance, beginning of period
 
$
6.1

 
$
5.8

Provision for doubtful accounts and customer disputes
 
3.2

 
4.6

Uncollectible receivables written off, net of recoveries
 
(4.7
)
 
(4.3
)
Other adjustments
 
(0.6
)
 
—

Balance, end of period
 
$
4.0

 
$
6.1