INCOME TAXES - Reconciliation of Tax Expense to Statutory Federal Income Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Computed income tax benefit	$ (34.6)	$ (61.3)
State and local taxes, net of U.S. federal income tax benefit	(3.3)	(2.9)
Foreign rate differential and other foreign adjustments	(5.4)	(9.3)
Net establishment of valuation allowance	19.1	75.0
Net release of uncertain tax positions	0.7	(4.3)
Foreign dividends and earnings taxable in the U.S.	23.2	12.8
Impairment for which there is no tax benefit	0.0	4.3
Impact of the Tax Act	0.0	(7.7)
Other	0.5	(4.4)
Income Tax Expense (Benefit), Total	$ 0.2	$ 2.2