INCOME TAXES - Narrative (Details) - USD ($) $ in Millions		12 Months Ended
	Dec. 22, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Provisional income taxes related to TCJA	$ 17.3
Income tax benefit		$ 11.5
Valuation allowance		211.4	$ 162.9
Unrecognized tax benefits		6.2	6.2	$ 1.5	$ 0.0
Domestic tax authority
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards		212.6
Valuation allowance		100.7	73.3
State and local jurisdiction
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards		8.6
Foreign tax authority
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards		873.1
Valuation allowance		$ 110.6	$ 89.6