EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 11.9	$ 13.9	$ 24.0	$ 27.8
Interest cost	4.6	1.9	8.9	3.9
Expected return on plan assets	(4.8)	(4.3)	(9.6)	(8.7)
Net periodic benefit cost	11.7	11.5	23.3	23.0
Post-Retirement Medical Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.1	0.2	0.3	0.4
Interest cost	0.1	0.2	0.3	0.3
Amortization of prior service cost and actuarial loss	0.0	0.0	0.0	0.1
Net periodic benefit cost	$ 0.2	$ 0.4	$ 0.6	$ 0.8