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ACCUMULATED OTHER COMPREHENSIVE LOSS - Schedule of Change in Unrealized Pension Costs (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Net prior service cost arising during period |  |  |
Pre-Tax Amount |  |  |
Prior service credit/cost arising during period | $ 0.0 | $ 0.7 | $ 0.0
Amortization of prior service credit | (0.8) | (0.8) | (0.7)
Other comprehensive income (loss) | (0.8) | (0.1) | (0.7)
Tax (Expense) Benefit |  |  |
Prior service credit/cost arising during period | (0.1) | 0.9 | (1.1)
Amortization of prior service credit | 0.2 | 0.1 | 0.3
Other comprehensive income (loss) | 0.1 | 1.0 | (0.8)
Net of Tax Amount |  |  |
Prior service credit/cost arising during period | (0.1) | 1.6 | (1.1)
Amortization of prior service credit | (0.6) | (0.7) | (0.4)
Other comprehensive income (loss) | (0.7) | 0.9 | (1.5)
Net actuarial gain (loss) arising during period |  |  |
Pre-Tax Amount |  |  |
Other comprehensive income (loss) | 1.2 | (11.8) | 17.9
Tax (Expense) Benefit |  |  |
Other comprehensive income (loss) | (0.4) | 1.0 | (2.7)
Net of Tax Amount |  |  |
Other comprehensive income (loss) | 0.8 | (10.8) | 15.2
Unrealized pension costs, net |  |  |
Pre-Tax Amount |  |  |
Prior service credit/cost arising during period | (0.2) | (11.1) | 17.3
Other comprehensive income (loss) | 0.4 | (11.9) | 17.2
Tax (Expense) Benefit |  |  |
Other comprehensive income (loss) | (0.3) | 2.0 | (3.5)
Net of Tax Amount |  |  |
Other comprehensive income (loss) | $ 0.1 | $ (9.9) | $ 13.7

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