BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Allowance for Doubtful Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 56.2	$ 67.9	$ 71.9
Bad debt expense, net of recoveries	9.0	21.7	25.7
Write-offs	(20.2)	(24.2)	(23.9)
Other charges	(1.7)	(9.2)	(5.8)
Ending balance	43.3	56.2	$ 67.9
Valuation allowances and reserves, related to divestitures	$ 0.7	$ 9.3