INCOME TAXES - General Matters (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards of various foreign jurisdictions	$ 1,541.3
Federal tax loss carryforwards	11.6
State tax loss carryforwards	89.6
Increase (decrease) in valuation allowance	69.6	$ 6.0
Valuation allowance increase recognized as increase in tax expense	17.0	$ 11.1
Tax Period 2019 Through 2037
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards that expire	$ 357.0