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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Service cost, net $ 5.2 $ 6.0 $ 7.9
Interest cost 0.9 0.8 1.0
Expected return on plan assets (1.4) (1.3) (2.0)
Settlements and curtailment gain 0.0 (7.4) (6.3)
Special termination benefits 0.0 0.0 0.6
Amortization of actuarial loss 0.9 0.8 0.9
Amortization of prior service (credit) cost (0.2) (0.1) 0.2
Net periodic pension benefit cost (credit) $ 5.4 $ (1.2) $ 2.3