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POSTRETIREMENT BENEFITS (Details 3) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Components of Net Periodic Benefit Cost [Abstract] |  |  |
Service cost | $ 5.7 | $ 8.4 |
Interest cost | 105.4 | 61.4 | $ 51.3
Amortization of prior service cost | (0.4) | (0.7) | (0.6)
Net periodic benefit cost | 20.7 | 33.0 | 27.5
Included in Pretax Other Comprehensive Income (Loss) |  |  |
Liability adjustment | 16.4 | (59.9) | (245.9)
Amortization of prior service costs and actuarial losses | 0.2 | 35.5 | 54.3
Other Postretirement Benefit Plans, Defined Benefit |  |  |
Components of Net Periodic Benefit Cost [Abstract] |  |  |
Service cost | 0.7 | 1.1 | 1.3
Interest cost | 1.8 | 1.1 | 1.0
Amortization of prior service cost | 0.1 | 0.1 | 0.1
Recognized actuarial loss | 0.5 | 1.5 | 2.1
Net periodic benefit cost | (3.1) | (3.8) | (4.5)
Included in Pretax Other Comprehensive Income (Loss) |  |  |
Liability adjustment | 1.7 | (12.2) | (3.8)
Amortization of prior service costs and actuarial losses | $ (0.6) | $ (1.6) | $ (2.2)

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