EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	$ 13.8	$ 10.9
Defined Benefit Plan, Interest Cost	1.8	2.1
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(3.1)	(2.4)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0.1	0.1
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total	12.6	10.7
Post Retirement Medical Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	0.3	0.2
Defined Benefit Plan, Interest Cost	0.1	0.2
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0.1	0.1
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total	$ 0.5	$ 0.5