INVESTMENTS (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Investments in and Advances to Affiliates [Abstract]
Equity method investments gain (loss)	$ (28.8)	$ 29.0

Amount of income (loss) for proportionate share of equity method investee's income (loss).

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