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ACCUMULATED OTHER COMPREHENSIVE LOSS - Change in Unrealized Pension Costs (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Net prior service cost arising during period |  |  |
Pre-Tax Amount |  |  |
Prior service credit arising during period | $ 0.0 | $ 0.1 | $ 0.6
Amortization of prior service credit | (0.7) | (0.7) | (0.7)
Other comprehensive income (loss) | (0.7) | (0.6) | (0.1)
Tax (Expense) Benefit |  |  |
Prior service credit arising during period | (1.1) | 0.0 | (0.2)
Amortization of prior service credit | 0.3 | 0.1 | 0.1
Other comprehensive income (loss) | (0.8) | 0.1 | (0.1)
Net of Tax Amount |  |  |
Prior service credit arising during period | (1.1) | 0.1 | 0.4
Amortization of prior service credit | (0.4) | (0.6) | (0.6)
Other comprehensive income (loss) | (1.5) | (0.5) | (0.2)
Net actuarial gain (loss) arising during period |  |  |
Pre-Tax Amount |  |  |
Other comprehensive income (loss) | 17.9 | 14.4 | (4.5)
Tax (Expense) Benefit |  |  |
Other comprehensive income (loss) | (2.7) | (2.3) | 0.5
Net of Tax Amount |  |  |
Other comprehensive income (loss) | 15.2 | 12.1 | (4.0)
Unrealized Pension (Costs) Credits |  |  |
Pre-Tax Amount |  |  |
Prior service credit arising during period | 17.3 | 12.8 | (5.5)
Other comprehensive income (loss) | 17.2 | 13.8 | (4.6)
Tax (Expense) Benefit |  |  |
Other comprehensive income (loss) | (3.5) | (2.2) | 0.4
Net of Tax Amount |  |  |
Other comprehensive income (loss) | $ 13.7 | $ 11.6 | $ (4.2)

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