EMPLOYEE BENEFIT PLANS - Costs Recognized Under Defined Contribution Plans and Multiemployer Pension Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Retirement Benefits [Abstract]
Multi-employer pension and health & welfare plans	$ 0.9	$ 1.0	$ 1.5
401(k) savings and other defined contribution plans	55.7	27.9	23.2
Total	$ 56.6	$ 28.8	$ 24.7