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ACCUMULATED OTHER COMPREHENSIVE LOSS - Change in Unrealized Pension Costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Pre-Tax Amount      
Prior service credit/cost arising during period $ 2.9 $ 42.0 $ (8.5)
Amounts reclassified from accumulated other comprehensive loss 15.3 (8.5) (6.9)
Tax (Expense) Benefit      
Other comprehensive income (loss) (16.2) 32.2 (0.4)
Prior Service Credit      
Pre-Tax Amount      
Prior service credit/cost arising during period 3.3 3.5 (9.0)
Amounts reclassified from accumulated other comprehensive loss (0.1) 0.2 (0.7)
Other comprehensive income (loss) 3.2 3.7 (9.7)
Tax (Expense) Benefit      
Prior service credit/cost arising during period (0.9) (0.4) 1.0
Amortization of prior service credit 0.0 0.0 0.0
Other comprehensive income (loss) (0.9) (0.4) 1.0
Net of Tax Amount      
Prior service credit/cost arising during period 2.4 3.1 (8.0)
Net of tax amortization (0.1) 0.2 (0.7)
Other comprehensive income (loss) 2.3 3.3 (8.7)
Net actuarial gain (loss) arising during period      
Pre-Tax Amount      
Other comprehensive income (loss) (2.3) 0.9 2.0
Tax (Expense) Benefit      
Other comprehensive income (loss) 0.6 (0.7) 0.5
Net of Tax Amount      
Other comprehensive income (loss) (1.7) 0.2 2.5
Unrealized pension credits (cost), net      
Pre-Tax Amount      
Prior service credit/cost arising during period 7.6 9.7 (7.7)
Amounts reclassified from accumulated other comprehensive loss (6.7) (5.1) 0.0
Other comprehensive income (loss) 0.9 4.6 (7.7)
Tax (Expense) Benefit      
Other comprehensive income (loss) (0.3) (1.1) 1.5
Net of Tax Amount      
Other comprehensive income (loss) $ 0.6 $ 3.5 $ (6.2)