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ACCUMULATED OTHER COMPREHENSIVE LOSS - Change in Unrealized Pension Costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Prior service credit      
Pre-Tax Amount      
Prior service credit arising during period $ 0.6 $ 4.6 $ 3.3
Amortization of prior service credit (0.7) (0.2) (0.1)
Other comprehensive income (loss) (0.1) 4.4 3.2
Tax (Expense) Benefit      
Prior service credit arising during period (0.2) (0.6) (0.9)
Amortization of prior service credit 0.1 0.1 0.0
Other comprehensive income (loss) (0.1) (0.5) (0.9)
Net of Tax Amount      
Prior service credit arising during period 0.4 4.0 2.4
Amortization of prior service credit (0.6) (0.1) (0.1)
Other comprehensive income (loss) (0.2) 3.9 2.3
Net actuarial gain (loss) arising during period      
Pre-Tax Amount      
Other comprehensive income (loss) (4.5) (6.9) (2.3)
Tax (Expense) Benefit      
Other comprehensive income (loss) 0.5 1.1 0.6
Net of Tax Amount      
Other comprehensive income (loss) (4.0) (5.8) (1.7)
Unrealized pension credits (cost), net      
Pre-Tax Amount      
Prior service credit arising during period (5.5) (3.2) 7.6
Other comprehensive income (loss) (4.6) (2.5) 0.9
Tax (Expense) Benefit      
Other comprehensive income (loss) 0.4 0.6 (0.3)
Net of Tax Amount      
Other comprehensive income (loss) $ (4.2) $ (1.9) $ 0.6