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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)