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ALLOWANCE FOR DOUBTFUL ACCOUNTS AND CUSTOMER DISPUTES (Tables)
 6 Months Ended
Jun. 30, 2020
Credit Loss [Abstract]  
Allowance for Doubtful Accounts and Customer Disputes
($ in millions)
Balance, December 31, 2019$4.0  
Cumulative effect of the adoption of ASC 3264.5  
Balance, January 1, 20208.5  
Provision for doubtful accounts and customer disputes1.0  
Uncollectible receivables written off, net of recoveries(1.9) 
Other adjustments(0.5) 
Balance, June 30, 2020$7.1