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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Changes in accumulated other comprehensive loss by component, net of taxes |  |  |
Balance at the beginning of the period | $ 677.2 | $ 494.9 | $ 450.6
Net gain in prior service cost |  | 0.8 | 24.1
Amortization of prior service cost | (4.7) | (4.0) | (2.2)
Amortization of net loss (gain) | 1.1 | 1.7 | 1.2
Other adjustments |  | 0.2 | 0.2
Balance at the end of the period | 755.3 | 677.2 | 494.9
Comprehensive Income (Loss): |  |  |
Tax benefit (expense) on other comprehensive income (loss) | 0.2 | (4.4) | (14.2)
Pensions |  |  |
Changes in accumulated other comprehensive loss by component, net of taxes |  |  |
Balance at the beginning of the period | (40.6) | (41.4) |
Reclassification adjustment related to the Tax Act | (9.2) |  |
Amortization of prior service cost | (1.7) | (1.4) |
Amortization of net loss (gain) | (4.3) | 2.2 |
Balance at the end of the period | (55.8) | (40.6) | (41.4)
Post Retirement |  |  |
Changes in accumulated other comprehensive loss by component, net of taxes |  |  |
Balance at the beginning of the period | 15.6 | 18.1 |
Net gain in prior service cost |  | 0.7 |
Reclassification adjustment related to the Tax Act | 3.4 |  |
Amortization of prior service cost | (2.9) | (2.5) |
Amortization of net loss (gain) | 5.6 | (0.7) |
Balance at the end of the period | 21.7 | 15.6 | 18.1
Non-Qualified Plans |  |  |
Changes in accumulated other comprehensive loss by component, net of taxes |  |  |
Balance at the beginning of the period | (0.3) | (0.4) |
Reclassification adjustment related to the Tax Act | (0.2) |  |
Amortization of prior service cost | (0.1) | (0.1) |
Amortization of net loss (gain) | 0.5 | 0.2 |
Balance at the end of the period | (0.1) | (0.3) | (0.4)
Other |  |  |
Changes in accumulated other comprehensive loss by component, net of taxes |  |  |
Balance at the beginning of the period | 0.4 | 0.1 |
Net gain in prior service cost |  | 0.1 |
Amortization of net loss (gain) | (0.7) |  |
Other adjustments |  | 0.2 |
Balance at the end of the period | (0.3) | 0.4 | 0.1
Accumulated Other Comprehensive Income (Loss) |  |  |
Changes in accumulated other comprehensive loss by component, net of taxes |  |  |
Balance at the beginning of the period | (24.9) | (23.6) | (46.9)
Net gain in prior service cost |  | 0.8 |
Reclassification adjustment related to the Tax Act | (6.0) |  |
Amortization of prior service cost | (4.7) | (4.0) |
Amortization of net loss (gain) | 1.1 | 1.7 |
Other adjustments |  | 0.2 |
Balance at the end of the period | $ (34.5) | $ (24.9) | $ (23.6)

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