INCOME TAXES - Schedule of Uncertain Tax Positions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance, January 1	$ 6.2	$ 1.5	$ 0.0
Changes for tax positions of prior years	0.0	0.0	2.8
Increases for tax positions related to the current year	0.0	6.2	0.0
Settlements and lapsing of statutes of limitations	0.0	(1.5)	(1.3)
Balance, December 31	$ 6.2	$ 6.2	$ 1.5