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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Pension Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Prior service costs | $ 0.0 | $ 0.0 | $ 0.0
Net actuarial (gain) loss | (5.9) | (10.7) | 1.9
Amortization of losses and prior service cost | (0.3) | (0.3) | (0.8)
Total changes in other comprehensive (income) loss | (6.2) | (11.0) | 1.1
Post Retirement Medical Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Prior service costs | 1.8 | 0.0 | 0.0
Net actuarial (gain) loss | 1.9 | (2.3) | (3.4)
Amortization of losses and prior service cost | (0.6) | (0.5) | (0.7)
Total changes in other comprehensive (income) loss | $ 3.1 | $ (2.8) | $ (4.1)

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