NEW ACCOUNTING PRONOUNCEMENTS - Valuation Allowance and Reserves (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Accounts Receivable and Allowance for Doubtful Accounts
Allowance for doubtful accounts, returns and credits	$ 15.3	$ 15.5
Activity in the allowance for doubtful accounts
Allowance for doubtful accounts, beginning balance	55.5	52.4
Bad debt expense	54.6	16.9
Write-offs	(25.0)	(14.2)
Other	(1.2)	(1.5)
Allowance for doubtful accounts, ending balance	88.2	$ 53.6
Accounting Standards Update 2016-13 | Adjustment.
Activity in the allowance for doubtful accounts
Allowance for doubtful accounts, ending balance	$ 4.3