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INCOME TAXES - COMPONENTS OF INCOME BEFORE INCOME TAXES FROM OPERATIONS (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
United States $ (109.8) $ (279.6) $ (145.0)
Foreign 455.2 (678.8) (1,458.5)
Income (loss) before income taxes $ 345.4 $ (958.4) $ (1,603.5)