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PENSION, HEALTH CARE AND OTHER POSTRETIREMENT BENEFITS - Summary of the Components of Net Periodic Benefit Cost and Cumulative Other Comprehensive Loss Related to Postretirement Benefits Other than Pensions (Details) - Other Postretirement Benefits - Domestic - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Net periodic benefit credit: |  |  |
Service cost | $ 0.2 | $ 0.5 | $ 0.6
Interest cost | 6.7 | 6.8 | 7.4
Amortization of actuarial gains | (2.4) | (0.4) | 0.1
Amortization of prior service credit | (14.3) | (23.9) | (23.9)
Net periodic benefit credit | (9.8) | (17.0) | (15.8)
Other changes in benefit obligation recognized in AOCI (before taxes): |  |  |
Net actuarial gain arising during the year | (2.3) | (8.6) | (8.0)
Amortization of actuarial gains | 2.4 | 0.4 | (0.1)
Amortization of prior service credit | 14.3 | 23.9 | 23.9
Total recognized in AOCI | 14.4 | 15.7 | 15.8
Total recognized in net periodic pension (credit) cost and AOCI | $ 4.6 | $ (1.3) | $ 0.0

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