SIGNIFICANT ACCOUNTING POLICIES - Valuation Allowance and Reserves (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounts Receivable and Allowance for Doubtful Accounts
Allowance for doubtful accounts, returns and credits	$ 72.0	$ 59.0	$ 19.0
Activity in the allowance for doubtful accounts
Beginning balance	71.9	52.8	68.4
Bad debt expense	54.0	38.1	15.0
Write-offs	(46.2)	(21.1)	(27.4)
Other (a)	(2.4)	2.1	(3.2)
Ending balance	$ 77.3	$ 71.9	$ 52.8