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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Components of Net Periodic Benefit Cost (Credit) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Pension |  |  |  |
Components of Net Periodic Benefit Cost (Credit) |  |  |  |
Service Cost | $ 1.6 | $ 1.7 | $ 4.9 | $ 4.9
Interest Cost | 9.7 | 10.2 | 29.0 | 30.4
Expected Return on Plan Assets | (11.2) | (10.9) | (33.6) | (32.8)
Amortization of Prior Service Credits | (0.1) | (0.1) | (0.1) | (0.1)
Amortization of Net Loss (Gain) | 1.7 | 1.4 | 4.9 | 4.3
Net Periodic Benefit Cost (Credit) | 1.7 | 2.3 | 5.1 | 6.7
Other Postretirement |  |  |  |
Components of Net Periodic Benefit Cost (Credit) |  |  |  |
Service Cost | 0.3 | 0.6 | 1.1 | 1.7
Interest Cost | 1.0 | 1.6 | 2.9 | 4.6
Expected Return on Plan Assets | (2.7) | (2.9) | (8.3) | (8.5)
Amortization of Prior Service Credits | (2.9) | (1.8) | (8.7) | (5.3)
Amortization of Net Loss (Gain) | (0.8) | (0.6) | (2.4) | (1.7)
Net Periodic Benefit Cost (Credit) | $ (5.1) | $ (3.1) | $ (15.4) | $ (9.2)

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