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INCOME TAXES - Summary of Activity in Deferred Tax Asset Valuation Allowance (Details) - SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year $ 4.8 $ 4.8 $ 6.2
Charge-Offs (0.2) 0.0 (2.6)
Other (0.3) 0.0 1.2
Balance at End of Year $ 4.3 $ 4.8 $ 4.8