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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)

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