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EMPLOYEE BENEFIT PLANS (Pre-tax Amounts Recognized in Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Qualified Plan
Defined Benefit Plan Disclosure [Line Items]
Prior service costs	$ 0.0	$ 0.0	$ 0.0
Net actuarial (gain) loss	(21.1)	(5.9)	(10.7)
Amortization of losses and prior service cost	(0.1)	(0.3)	(0.3)
Total changes in other comprehensive (income) loss	(21.2)	(6.2)	(11.0)
Post-Retirement Medical Plan
Defined Benefit Plan Disclosure [Line Items]
Prior service costs	0.0	1.8	0.0
Net actuarial (gain) loss	(4.0)	1.9	(2.3)
Amortization of losses and prior service cost	(0.7)	(0.6)	(0.5)
Total changes in other comprehensive (income) loss	$ (4.7)	$ 3.1	$ (2.8)

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- Definition

Amount, before tax, after reclassification adjustment, of increase (decrease) in accumulated other comprehensive income from gain (loss) of defined benefit plan.

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