EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 12.0	$ 13.9	$ 36.0	$ 41.7
Interest cost	4.5	1.8	13.3	5.8
Expected return on plan assets	(4.8)	(4.3)	(14.4)	(13.1)
Amortization of prior service cost and actuarial loss	0.0	0.1	0.1	0.1
Net periodic benefit cost	11.7	11.5	35.0	34.5
Post-Retirement Medical Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.1	0.2	0.4	0.6
Interest cost	0.2	0.0	0.5	0.3
Amortization of prior service cost and actuarial loss	0.0	0.2	0.0	0.3
Net periodic benefit cost	$ 0.3	$ 0.4	$ 0.9	$ 1.2