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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

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