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INCOME TAXES - UNRECOGNIZED TAX BENEFITS (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of the beginning and ending amount of gross unrecognized tax benefits      
Balance at beginning of the period $ 15.1 $ 15.9 $ 20.4
Changes in tax positions of prior years, net   (0.3)  
Changes in tax positions of prior years, net 2.1   1.1
Reductions for lapse of statute of limitations (0.8) (0.5) (0.1)
Revaluation of unrecognized tax benefits due to the Tax Act     (5.5)
Balance at the end 16.4 15.1 $ 15.9
Unrecognized tax benefits that, if recognized, would impact the effective rate 13.5    
Interest accrued related to unrecognized tax benefits $ 0.1 $ 0.4