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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