INCOME TAXES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 30, 2020
Operating Loss Carryforwards [Line Items]
Effective tax rate	(5.80%)	(51.70%)
Impairment of intangible assets, deferred income tax	$ 44.8
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Clear Media Limited
Operating Loss Carryforwards [Line Items]
Deferred income taxes recorded from sale	$ 44.8
Ownership percentage sold	50.91%		50.91%