INCOME TAXES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Loss Carryforwards [Line Items]
Provisional benefit for remeasurement of deferred tax liabilities as result of change in tax rate			$ 1.3
Benefit for remeasurement of deferred tax liabilities as result of change in tax rate, less than		$ 0.1
GILTI inclusion		2.3
GILTI net tax liability		0.1
Interest and penalties related to uncertain tax positions		0.2
Capital Loss Carryforward
Operating Loss Carryforwards [Line Items]
Capital loss carryforward		$ 51.3
Restatement Adjustment
Operating Loss Carryforwards [Line Items]
Reduction to deferred tax assets to correct error from prior periods	$ 8.6			$ 4.6	$ 2.7	$ 1.3