NEW ACCOUNTING PRONOUNCEMENTS - Valuation Allowance and Reserves (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Accounts Receivable and Allowance for Doubtful Accounts
Allowance for doubtful accounts, returns and credits	$ 14.2	$ 16.5
Activity in the allowance for doubtful accounts
Allowance for doubtful accounts, beginning balance	55.5	52.4
Bad debt expense	47.1	10.9
Write-offs	(15.6)	(7.6)
Other	(5.0)	(0.6)
Allowance for doubtful accounts, ending balance	86.3	$ 55.1
Accounting Standards Update 2016-13 | Adjustment.
Activity in the allowance for doubtful accounts
Allowance for doubtful accounts, ending balance	$ 4.3