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ACQUISITIONS AND DISCONTINUED OPERATIONS - Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Discontinued Operations and Disposal Groups [Abstract]    
Depreciation and amortization $ 0.0 $ 3.3
Deferred taxes 0.1 (1.4)
Impairments 0.1 82.1
Capital expenditures $ 0.0 $ (3.4)