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BASIS OF PRESENTATION - Allowance for Doubtful Accounts (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning Balance $ 9.9 $ 9.1
Provision for credit losses 1.8 6.4
Other adjustments (2.2) (5.6)
Ending Balance $ 9.5 $ 9.9