NEW ACCOUNTING PRONOUNCEMENTS - Valuation Allowance and Reserves (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Accounts Receivable and Allowance for Doubtful Accounts
Allowance for doubtful accounts, returns and credits	$ 18.0	$ 17.0
Activity in the allowance for doubtful accounts
Allowance for doubtful accounts, beginning balance	62.0	60.6
Bad debt expense	16.1	3.4
Write-offs	(5.3)	(4.2)
Other (b)	(1.2)	(1.4)
Allowance for doubtful accounts, ending balance	75.9	$ 58.4
Accounting Standards Update 2016-13 | Adjustment.
Activity in the allowance for doubtful accounts
Allowance for doubtful accounts, beginning balance	$ 4.3