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EMPLOYEE BENEFIT PLANS - Components of Net Periodic Benefit Cost (Details) - Defined benefit pension plans - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Service cost, net $ 6.3 $ 5.2 $ 6.0
Interest cost 0.5 0.9 0.8
Expected return on plan assets (1.0) (1.4) (1.3)
Settlements and curtailment gain 0.0 0.0 (7.4)
Amortization of actuarial loss 1.6 0.9 0.8
Amortization of prior service credit (0.7) (0.2) (0.1)
Net periodic pension benefit cost (credit) $ 6.7 $ 5.4 $ (1.2)