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ACCUMULATED OTHER COMPREHENSIVE LOSS - Change in Unrealized Pension Costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Net prior service cost arising during period      
Pre-Tax Amount      
Prior service credit arising during period $ 0.1 $ 0.6 $ 4.6
Amortization of prior service credit (0.7) (0.7) (0.2)
Other comprehensive income (loss) (0.6) (0.1) 4.4
Tax (Expense) Benefit      
Prior service credit arising during period 0.0 (0.2) (0.6)
Amortization of prior service credit 0.1 0.1 0.1
Other comprehensive income (loss) 0.1 (0.1) (0.5)
Net of Tax Amount      
Prior service credit arising during period 0.1 0.4 4.0
Amortization of prior service credit (0.6) (0.6) (0.1)
Other comprehensive income (loss) (0.5) (0.2) 3.9
Net actuarial loss arising during period      
Pre-Tax Amount      
Other comprehensive income (loss) 14.4 (4.5) (6.9)
Tax (Expense) Benefit      
Other comprehensive income (loss) (2.3) 0.5 1.1
Net of Tax Amount      
Other comprehensive income (loss) 12.1 (4.0) (5.8)
Unrealized pension costs, net      
Pre-Tax Amount      
Prior service credit arising during period 12.8 (5.5) (3.2)
Other comprehensive income (loss) 13.8 (4.6) (2.5)
Tax (Expense) Benefit      
Other comprehensive income (loss) (2.2) 0.4 0.6
Net of Tax Amount      
Other comprehensive income (loss) $ 11.6 $ (4.2) $ (1.9)