EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 13.9	$ 14.4
Interest cost	2.0	1.3
Expected return on plan assets	(4.4)	(3.6)
Net periodic benefit cost	11.5	12.1
Post-Retirement Medical Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.2	0.4
Interest cost	0.1	0.1
Amortization of prior service cost and actuarial loss	0.1	0.2
Net periodic benefit cost	$ 0.4	$ 0.7